FURAN-MODIFIED COMPOUND AND OLIGOMER

Abstract

The invention provides a furan-modified compound or oligomer. The compound has a structure represented by Formula I:

##STR00001##

When formula I represents a compound, x is an integer of 15; A including a group formed of ketone, amido, imide, imido, phenyl ether or enol ether group; G is a direct bond, O, N, ArNH(CH.sub.2).sub.b, ArO(CH.sub.2).sub.b, ArO(CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aO(CH.sub.2).sub.b or (CH.sub.2).sub.aCH(OH)(CH.sub.2).sub.bNH; Ar is substituted or unsubstituted arylene group; a is an integer of 1 to 5; and b is an integer of 0 to 5.

Claims

1. A furan-modified compound having a structure represented by Formula I: ##STR00014## wherein, x is an integer of 1 to 5; A is a group comprising ketone, amido, imide, imido, phenyl ether and enol ether group; G is a direct bond, O, N, ArNH(CH.sub.2).sub.b, ArO(CH.sub.2).sub.b, ArO(CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aO(CH.sub.2).sub.b or (CH.sub.2).sub.aCH(OH)(CH.sub.2).sub.bNH; Ar is substituted or unsubstituted arylene group; a is an integer of 1 to 5; and b is an integer of 0 to 5.

2. The furan-modified compound according to claim 1, wherein Ar is substituted or unsubstituted phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrylene, indenylene, anthrylene, or fluorenylene group.

3. The furan-modified compound according to claim 1, wherein Ar is phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrylene, indenylene, anthrylene, or fluorenylene group with substitution groups of one to four C.sub.1C.sub.6 alkyl groups.

4. The furan-modified compound according to claim 1, wherein A is ##STR00015## R is hydrogen, halogen, C.sub.1C.sub.8 alkyl, C.sub.1C.sub.8 haloalkyl, C.sub.5C.sub.10 cycloalkyl, or C.sub.6C.sub.12 aryl; A is connected to G at position represented by asterisk (*).

5. The furan-modified compound according to claim 4, wherein R is hydrogen, fluorine, methyl, ethyl, propyl, isopropyl, n-butyl, second butyl, isobutyl, t-butyl, pentyl, hexyl, fluorine methyl, fluorine ethyl, cyclopentyl, cyclohexyl, phenyl, biphenyl, or naphthyl.

6. The furan-modified compound according to claim 1, wherein A is ##STR00016## A is connected to G at position represented by asterisk (*); R.sub.8 is CH.sub.3 or C.sub.2H.sub.5; t is an integer of 1 to 5; and e is an integer of 1 to 5.

7. A furan-modified oligomer having a structure represented by Formula II: ##STR00017## wherein, y is an integer of 1 to 5; B is a repeating group comprising amine, amide, maleimide, ester group, phenyl ether and enol ether group; D is a direct bond, O, N, Ar.sub.2NH(CH.sub.2).sub.d, Ar.sub.2O(CH.sub.2).sub.d, Ar.sub.2O(CH.sub.2).sub.cNH(CH.sub.2).sub.d, (CH.sub.2).sub.cNH(CH.sub.2).sub.d, (CH.sub.2).sub.cO(CH.sub.2).sub.d or (CH.sub.2).sub.cCH(OH)(CH.sub.2).sub.dNH; Ar.sub.2 is substituted or unsubstituted arylene group; c is an integer of 1 to 5; and d is an integer of 0 to 5, wherein the furan-modified oligomer has a number average molecular weight from 1000 to 12000.

8. The furan-modified oligomer according to claim 7, wherein Ar.sub.2 is substituted or unsubstituted phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrylene, indenylene, anthrylene, or fluorenylene group.

9. The furan-modified oligomer according to claim 7, wherein Ar.sub.2 is phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrylene, indenylene, anthrylene, or fluorenylene group with substitution groups of one to four C.sub.1C.sub.6 alkyl groups.

10. The furan-modified oligomer according to claim 7, wherein B is ##STR00018## B is connected to D at position represented by asterisk (*); m is an integer between is an integer of 7 to 200; n is an integer of 7 to 200; each of p, r and s is an integer of 1 to 5; q is an integer of 5 to 50; z is an integer of 5 to 20; each of R.sub.1, R.sub.2, R.sub.3, R.sub.4 is independently C.sub.1C.sub.5 alkyl; T.sub.1 is a direct bond, C.sub.1C.sub.12 linear or branched alkyl, O, S or NH; Q is ##STR00019## wherein, each of R.sub.9, R.sub.10 and R.sub.11 is independently CH.sub.3 or C.sub.2H.sub.5, T.sub.2 is C.sub.1C.sub.12 linear or branched alkyl, and each of i, j and k is an integer of 1 to 5.

Description

DETAILED DESCRIPTION

[0009] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details.

[0010] According to an embodiment of the present invention, a furan-modified compound is provided. The furan-modified compound has a structure represented by Formula I:

##STR00004##

wherein, x is an integer of 1 to 5, A is a group including ketone group, amido group, imide group, imido group, phenyl ether group or enol ether group; G is a direct bond, O, N, ArNH(CH.sub.2).sub.b, ArO(CH.sub.2).sub.b, ArO(CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aNH(CH.sub.2).sub.b, (CH.sub.2).sub.aO(CH.sub.2).sub.b or (CH.sub.2).sub.aCH(OH)(CH.sub.2).sub.bNH; Ar is substituted or unsubstituted arylene group; a is an integer of 1 to 5; and b is an integer of 0 to 5.

[0011] In some embodiments of the disclosure, A can be

##STR00005##

R is hydrogen, halogen, C.sub.1C.sub.8 alkyl, C.sub.1C.sub.8 haloalkyl, C.sub.1C.sub.10 cycloalkyl, or C.sub.6C.sub.12 aryl group; and A is connected to G at position represented by asterisk (*). More specifically, R can be hydrogen, fluorine, methyl, ethyl, propyl, isopropyl, n-butyl, second butyl, isobutyl, t-butyl, pentyl, hexyl, fluorine methyl, fluorine ethyl, cyclopentyl, cyclohexyl, phenyl, biphenyl, or naphthyl. For example, A can be

##STR00006##

and A is connected to G at position represented by asterisk (*), wherein R.sub.8 is CH.sub.3 or C.sub.2H.sub.5, t is an integer of 1 to 5, e is an integer of 1 to 5.

[0012] According to an embodiment of the present disclosure, Ar is substituted or unsubstituted phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrenylene, indenylene, anthracenylene, or fluorenylene group. Specifically, Ar can be phenylene, diphenylene, naphthylene, thienylene, indolylene, phenanthrenylene, indenylene, anthracenylene, or fluorenylene group with substitution groups of one to four C.sub.1C.sub.6 alkyl groups.

[0013] In an embodiment of the present invention, a furan-modified oligomer is provided. The furan-modified oligomer has a structure represented by Formula II:

##STR00007##

wherein, y is an integer of 1 to 5, B is a repeating group including of amine, amide, maleimide, ester group, phenyl ether or enol ether group; D is a direct bond, O, N, Ar.sub.2NH(CH.sub.2).sub.d, Ar.sub.2O(CH.sub.2).sub.d, Ar.sub.2O(CH.sub.2).sub.cNH(CH.sub.2).sub.d, (CH.sub.2).sub.cNH(CH.sub.2).sub.d, (CH.sub.2).sub.cO(CH.sub.2).sub.d or (CH.sub.2).sub.cCH(OH)(CH.sub.2).sub.dNH; Ar.sub.2 is substituted or unsubstituted arylene; c is an integer of 1 to 5; and d is an integer of 0 to 5. The furan-modified oligomer has a number average molecular weight from 1000 to 12000.

[0014] For example, B can be

##STR00008##

wherein B is connected to D at position represented by asterisk (*); m is an integer of 7 to 200; n is an integer of 7 to 200; each of p, r and s is an integer of 1 to 5; q is an integer of 5 to 50; z is an integer of 5 to 20; each of R.sub.1, R.sub.2, R.sub.3, R.sub.4 is independently C.sub.1-C.sub.5 alkyl; T.sub.1 is a direct bond, C.sub.1C.sub.12 linear or branched alkyl, O, S or NH; Q is

##STR00009##

wherein, each of R.sub.9, R.sub.10 and R.sub.11 is independently CH.sub.3 or C.sub.2H.sub.5, T.sub.2 is C.sub.1C.sub.12 linear or branched alkyl, and each of i, j and k is an integer of 1 to 5.

[0015] According to an embodiment of the present disclosure, Ar.sub.2 is substituted or unsubstituted phenylene, biphenylene, naphthylene, thienylene, indolylene, phenanthrenylene, indenylene, anthracenylene, or fluorenylene. Specifically, Ar.sub.2 can be phenylene, diphenylene, naphthylene, thienylene, indolylene, phenanthrenylene, indenylene, anthracenylene, or fluorenylene with substitution groups of one to four C.sub.1C.sub.6 alkyl groups.

[0016] A number of exemplary embodiments and comparison examples are provided below to make the furan-modified compound and/or the oligomer and the application thereof better understood. The disclosure below is exemplified by reversible cross-linking reaction composition and the composite material formed of the reversible cross-linking reaction composition.

Preparation Examples of Furan-Modified Compound and/or Oligomer

Oligomer Having a Structure Represented by Formula I-1

[0017] ##STR00010##

In Formula I-1, m was 7200, n was 7200, and the oligomer had a number average molecular weight of 200012000.

Example 1

[0018] 60 grams of styrene maleic anhydride (SMA, purchased from the Polyscope, the weight average molecular weight (Mw) is 7500) was added to and dissolved in 80 grams of dimethylacetamide (DMAc, purchased from the Echo Chemical) solvent. Then, 29.6 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-1 was obtained. Then, the physical properties of oligomer were measured, as shown in Table 1.

Example 2

[0019] 60 grams of styrene maleic anhydride (SMA, purchased from the Polyscope, the weight average molecular weight (Mw) is 9000) was added to and dissolved in 80 grams of dimethylacetamide (DMAc) solvent. Then, 22.33 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-1 is obtained. Then, the physical properties of oligomer were measured, as shown in Table 1.

Example 3

[0020] 83 grams of styrene maleic anhydride (SMA, purchased from the Polyscope, the weight average molecular weight (Mw) is 10000) was added to and dissolved in 115 grams of dimethylacetamide (DMAc) solvent. Then, 40 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-1 was obtained. Then, the physical properties of the oligomer were measured, as shown in Table 1.

Analysis of Properties and Results

[0021] The oligomers prepared in Examples 1 to 3 were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the CO.sub.2NH character peaks of 1701 cm.sup.1 and 1776 cm.sup.1 mean that the furfurylamine was grafted on the styrene maleic anhydride to form the maleimide functional group. The COC character peaks of 1006 cm.sup.1 and 1068 cm.sup.1 and the CC character peak of 1491 cm.sup.1 mean the signals of furan group in the furfurylamine. In addition, the oligomers prepared in Examples 1 to 3 were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 1. The oligomers prepared in Examples 1 to 3 were also analyzed by gel permeation chromatography (RI 830, JASCO) to measure their weight average molecular weight (Mw), as tabulated in Table 1.

TABLE-US-00001 TABLE 1 Compositions SMA Characteristics Mw (g) FA (g) Tg ( C.) Mw Example 1 7,500 60 29.6 121 8,700 Example 2 9,000 60 22.33 112 10,500 Example 3 10,000 83 40 103 11,800

Oligomer Having a Structure Represented by Formula I-2

[0022] ##STR00011##

In Formula I-2, x was 547; and the oligomer had a number average molecular weight of 10006000.

Example 4

[0023] 60 grams of polyphenylene ether (PPE, purchased from the Sabic, Mn: 1600) was added to and dissolved in 60 grams of dimethylacetamide (DMAc) solvent. Then, 6.9 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-2 was obtained. Then, the physical properties of the oligomer were measured, as shown in Table 2.

Example 5

[0024] 60 grams of polyphenylene ether (PPE, purchased from the Sabic, Mn: 2350) was added to and dissolved in 60 grams of dimethylacetamide (DMAc) solvent. Then, 8 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-2 was obtained. Then, the physical properties of oligomer were measured, as showed in Table 2.

Analysis of Properties and Results

[0025] The oligomers prepared in Examples 4 and 5 were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the NH character peak of 3200 cm.sup.1 to 3400 cm.sup.1 means that the furfurylamine was grafted on the polyphenylene ether. The COC character peaks of 1006 cm.sup.1 and 1068 cm.sup.1 and the CC character peak of 1491 cm.sup.1 mean the signals of furan group in the furfurylamine. In addition, the oligomers prepared in Examples 4 and 5 were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 2. The oligomers prepared in Examples 4 and 5 were also analyzed by gel permeation chromatography (RI 830, JASCO) to measure their weight average molecular weight (Mw), as tabulated in Table 2.

TABLE-US-00002 TABLE 2 Compositions PPE Characteristics Mw (g) FA (g) Tg ( C.) Mw Example 4 1,600 60 6.9 142 3,850 Example 5 2,350 60 8 152 5,210

Oligomer Having a Structure Represented by Formula I-3

[0026] ##STR00012##

In formula I-3, z was 520 and the oligomer had a number average molecular weight of 9003000.

Example 6

[0027] 50 grams of epoxy acrylate oligomer (DOUNLEMER1730, purchased from the Double Bond Chemical) was added to 60 grams of dimethylacetamide (DMAc) solvent. Then, 10 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.140 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and an oligomer having a structure represented by Formula I-3 was obtained. Then, the physical properties of the oligomer were measured, as showed in Table 3.

Analysis of Properties and Results

[0028] The oligomer prepared in Example 6 was analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure its IR spectrum. In the IR spectrum data, the NH character peak of 3200 cm.sup.1 to 3400 cm.sup.1 means that the furfurylamine was grafted on the epoxy acrylate oligomer. The COC character peaks of 1006 cm.sup.1 and 1068 cm.sup.1 and the CC character peak of 1491 cm.sup.1 mean the signals of furan group in the furfurylamine. In addition, the oligomer prepared in Example 6 was analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure its glass transfer temperature (Tg), as tabulated in Table 3. The oligomer prepared in Example 6 was also analyzed by gel permeation chromatography (RI 830, JASCO) to measure its weight average molecular weight (Mw), as tabulated in Table 3.

TABLE-US-00003 TABLE 3 Compositions Epoxy acrylate oligomer Characteristics Mn (g) FA (g) Tg ( C.) Mw Example 6 ~850 60 8.5 125.3 ~927

Compound Having a Structure Represented by Formula I-4

[0029] ##STR00013##

In Formula I-4, T is CH.sub.2CH(OH)-group or CH.sub.2CH.sub.2-group.

Example 7

[0030] 50 grams of triallyl isocyanurate (TAIC, purchased from the Aldrich Chemical) was added to 60 grams of dimethylacetamide (DMAc) solvent. Then, 19.48 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and a compound having a structure represented by Formula I-4 was obtained.

Example 8

[0031] 50 grams of tris (2,3-epoxy propyl) isocyanurate (TEPIC, purchased from the Nissan Chemical) was added to 60 grams of dimethylacetamide (DMAc) solvent. Then, 23 grams of furfurylamine (FA, purchased from the Aldrich Chemical) was added to the solution, and then heated to 100 C.160 C. and stirred to react. After completing the reaction, the solution was cooled down to room temperature, and a compound having a structure represented by Formula I-4 was obtained.

Analysis of Properties and Results

[0032] The compounds prepared in Examples 7 and 8 were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the NH character peak of 3200 cm.sup.1 to 3400 cm.sup.1 means that the furfurylamine was grafted on the triallyl isocyanurate or the tris(2,3-epoxy propyl) isocyanurate. The COC character peaks of 1006 cm.sup.1 and 1068 cm.sup.1 and the CC character peak of 1491 cm.sup.1 mean the signals of furan group in the furfurylamine. In addition, the compounds prepared in Examples 7 and 8 were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 4.

TABLE-US-00004 TABLE 4 Compositions Characteristics TAIC (g) TEPIC (g) FA (g) Tg ( C.) Example 7 50 0 19.48 143.17 Example 8 0 50 23 152

Preparation Examples of Recyclable Resin Composition

Recyclable Resin Compositions Including Single Type of Furan-Modified Oligomer

Example 9

[0033] 100.47 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1 and 50 grams of bismaleimide compound BMI-1000 (purchased from K.I. Chemical Industry; the molecular weight: 358.35) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition I.

Example 10

[0034] 271.2 grams of the oligomer having a structure represented by Formula I-2 synthesized in example 4 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition II.

Example 11

[0035] 40.18 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1 and 10 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted for 30 minutes at 50 C.60 C. to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition III.

Example 12

[0036] 108.4 grams of the oligomer having a structure represented by Formula I-2 synthesized in example 4 and 10 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted for 30 minutes at 50 C.60 C. to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition IV.

Example 13

[0037] 50.24 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted for 30 minutes at 50 C.60 C. to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition V.

Example 14

[0038] 135.6 grams of the oligomer having a structure represented by Formula I-2 synthesized in example 4 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted for 30 minutes at 50 C.60 C. to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition VI.

Analysis of Properties and Results

[0039] The cross-linked compositions I to VI prepared in Examples 9 to 14 were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the original BMI-1000 character peak of 822 cm.sup.1 disappeared after the reaction, and the signal intensity of the COC character peak on the furan group of 1068 cm.sup.1 was obviously lowered, which means that the cross-linked products were formed. In addition, the cross-linked compositions I to VI prepared in Examples 9 to 14 were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 5. The cross-linked compositions I to VI prepared in Examples 9 to 14 were respectively sampled as 5 mg and analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.), in which each of the samples was heated to 350 C. at a heating rate of 5 C./min to measure the reversible crosslinking temperature (Tr) of the cross-linked compositions I to VI prepared in Examples 9 to 14, as tabulated in Table 5. As seen in the reversible crosslinking temperature (Tr) in Table 5, the cross-linked compositions in Examples were stable at a high temperature of at least 160 C. and were still stable even at a temperature above 260 C.

TABLE-US-00005 TABLE 5 Composition (a) furan- group-containing (b) oligomer (g) bismaleimide (a)/(b) Properties Formula Formula (g) Molar Tg Tr (I-1) (I-2) BMI-1000 ratio ( C.) ( C.) Example 9 100.47 50 1/1 168 230 Example 10 271.2 50 1/1 154 230 Example 11 40.18 10 2/1 175 220 Example 12 108.4 10 2/1 168 230 Example 13 50.24 50 1/2 145 180 Example 14 135.6 50 1/2 132 161

Compositions Including Multiple Types of Furan-Modified Compound and/or Oligomer

Example 15

[0040] 54.24 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1, 135.6 grams of the oligomer having a structure represented by Formula II-2 synthesized in example 4 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition VII.

Example 16

[0041] 54.24 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1, 42.38 grams of the compound having a structure represented by Formula I-4 synthesized in example 7 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition VIII.

Example 17

[0042] 135.6 grams of the oligomer having a structure represented by Formula I-2 synthesized in example 4, 42.38 grams of the compound having a structure represented by Formula I-4 synthesized in example 7 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition IX.

Example 18

[0043] 33.5 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1, 90.4 grams of the oligomer having a structure represented by formula (I-2) synthesized in example 4, 28.3 grams of the compound having a structure represented by Formula I-4 synthesized in example 7 and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were reacted at 50 C.60 C. for 30 minutes to form a varnish (reversible cross-linking reaction composition). Then, the varnish was put in an oven and reacted at 170 C.190 C. to obtain cross-linked composition X.

Analysis of Properties and Results

[0044] The cross-linked compositions VII to X prepared in Examples 15 to 18 were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the original CC character peak on BMI-1000 of 822 cm.sup.1 disappeared after the reaction, and the signal intensity of the COC character peak on the furan group of 1068 cm.sup.1 was obviously lowered, which means that the cross-linked products were formed. In addition, the cross-linked compositions VII to X prepared in Examples 15 to 18 were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 6. The cross-linked compositions VII to X prepared in Examples 15 to 18 were respectively sampled as 5 mg and analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.), in which each of the samples was heated to 350 C. at a heating rate of 5 C./min to measure the reversible crosslinking temperature (Tr) of the cross-linked compositions VII to X prepared in Examples 15 to 18, as tabulated in Table 6. As seen in the reversible crosslinking temperature (Tr) of Table 6, the cross-linked compositions in Examples could be stable at a high temperature of at least 160 C. and is still stable at a temperature above 300 C.

TABLE-US-00006 TABLE 6 Composition (a) furan-group- (b) containing bismalei- oligomer (g) mide (a)/ For- For- For- (g) (b) Properties mula mula mula BMI- molar Tg Tr (I-1) (I-2) (III-1) 1000 ratio ( C.) ( C.) Example 15 54.24 135.6 50 1/1 185 200 Example 16 54.24 42.38 50 1/1 169 250 Example 17 135.6 42.38 50 1/1 251 300 Example 18 33.5 90.4 28.3 50 1/1 237 290

Test and Result of Reversible Reaction

[0045] The cross-linked compositions I to X prepared in Examples 9 to 18 were crushed. The cross-linked compositions were heated to about 250 C.300 C. to crack the crosslinking bondings and reverse back to varnish state, and then cooled to 60 C.80 C. to further harden to bulks. The bulks were analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure their IR spectra. In the IR spectra data, the original CC character peak on BMI-1000 of 822 cm.sup.1 reappeared, and the signal intensity of the COC character peak on the furan group of 1068 cm.sup.1 was obviously enhanced, which means that the crosslinking bondings of the cross-linked compositions were cracked, thereby recovering back to the compositions of furan group-containing oligomer and/or compound and BMI-1000.

Discussion on the Results of Analysis

[0046] For the reversible crosslinking reactant compositions in Examples, the two maleimide groups of the bismaleimide compound could react with the furan groups of two furan group-containing oligomer or compound through the 1,2-addition reaction. When the steric structure achieved a specific temperature, the bondings formed from the 1,2-addition reaction would be cracked, thereby breaking the bridge between the furan group-containing oligomer/compound and the bismaleimide compound for recovering back to original reactants. The above properties are beneficial to recycle and reuse the compositions. According to the result of the Examples, the reversible crosslinking reactant compositions of the disclosure had a stable structure, high thermal resistance, and high reversible temperature, which were beneficial for use in high-temperature processes. For example, the composition serving as the insulation resin material for PCB should be intact during the reflow process, such that the reversible temperature of the composition was preferably higher than or equal to 250 C.

Synthesis and Analysis of Composite Material

Example 19

[0047] 33.5 grams of the oligomer having a structure represented by Formula I-1 synthesized in example 1, 90.4 grams of the oligomer having a structure represented by formula (I-2) synthesized in example 4, 28.3 grams of the compound having a structure represented by Formula I-4 synthesized in example 7, and 50 grams of BMI-1000 (purchased from K.I. Chemical Industry) were added to 75 grams of dimethylacetamide (DMAc) solvent, and reacted at 50 C.60 C. for 30 minutes to form a varnish. A glass fiber cloth was impregnated in the varnish, and then backed at 140 C.170 C. to prepare a prepreg. The prepregs were laminated with copper foil to form copper clad laminate.

Comparative Example

[0048] 100 wt % of Epoxy resin 828 (BE-188, commercially available from Chang Chun Chemical Co., Ltd.), 5 phr of dicyandiamide (commercially available from Echo Chemical Co., Ltd), and 500 ppm of 2-methylimidazole (2-MI, commercially available from Echo Chemical Co., Ltd.) were added to methyl ethyl ketone (MEK, commercially available from Echo Chemical Co., Ltd) to prepare a varnish with a solid content of 70%. A glass fiber cloth was impregnated in the varnish, and then backed at 170 C. to prepare a prepreg. The prepregs were laminated with copper foil to form copper clad laminate. The lamination process was performed at a temperature of 170 C.190 C. for 1 hours to 2 hours under a pressure of 350 psi-450 psi. The prepared copper clad laminate was FR-4 plate for general PCB.

Analysis of Properties and Results

[0049] The copper clad laminates in Examples 19 and Comparative Example were analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their glass transfer temperature (Tg), as tabulated in Table 7. The copper clad laminates in Examples 19 and Comparative Example were analyzed by thermomechanical analyzer (Q400, TA Instrument Co., Ltd.) under the standard IPC-TM-650.2.4.24 to measure their coefficient of thermal expansion (CTE), as tabulated in Table 7. The copper clad laminates in Examples 19 and Comparative Example were analyzed by thermogravimetric analysis (Q500, TA Instrument Co., Ltd.) under the standard IPC-TM-650 2.3.40 to measure their degradation temperature (Td), as tabulated in Table 7. The copper clad laminates in Examples 19 and Comparative Example were respectively sampled as 5 mg and analyzed by differential scanning calorimeter (Q10, TA Instrument Co., Ltd.), in which each of the samples was heated to 350 C. at a heating rate of 5 C./min to measure the reversible crosslinking temperature (Tr) of the copper clad laminates in Examples 19 and Comparative Example, as tabulated in Table 7. The copper clad laminates in Examples 19 and Comparative Example were analyzed by resonant cavity type microwave dielectrometer (AET company, Japan) under the standard JIS-compliant 1641 to measure their dielectric constant (Dk) and dissipation factor (Df), as tabulated in Table 7. As shown in Table 7, the copper clad laminates in Example 19 and Comparative Example had similar dielectric constant and similar dissipation factor. Compared to Comparative Example, the copper clad laminate in Example 19 had a reversible crosslinking temperature of 300 C. The resin in the copper clad laminate in Example 19 can be reversible cross-linked by heating to about 300 C., thereby forming the furan-group-containing oligomer and/or compound and the bismaleimide compound for being recycled.

TABLE-US-00007 TABLE 7 Tg XY-CTE Td Tr ( C.) (ppm/ C.) ( C.) ( C.) Dk Df Example 19 180~212 16~20 360 300 3.75 0.012 Comparative 140 30 350 n/a 4.2 0.015 example

Reversible Reaction Test and Result

[0050] The copper clad laminate in Example 19 was etched to remove the copper foils, and then put into a solution of about 250 C. to 300 C. to dissolve and recycle the composition. The recycled resin composition was collected and analyzed by reflection IR spectroscopy (Spectrum One-54415, PERLIN ELMER) to measure its IR spectrum. In the IR spectrum data, the CC character peak on BMI-1000 of 822 cm.sup.1 reappeared, and the signal intensity of the COC character peak on the furan group of 1068 cm.sup.1 was obviously enhanced, which means that the crosslinking bondings of the resin compositions were cracked, thereby recovering back to the original furan group-containing oligomer or compound and BMI-1000. In addition, the recycled resin composition was cured again, and the cured resin composition had the same Tg as that of the cured original resin composition (Example 18). It further proves that the composite material in Example 19 can be recycled to be reused.

Discussion on the Results of Analysis

[0051] The composites prepared by methods of Examples included reversible crosslinking reactant compositions, thereby increasing the recycling ratio of the composites. For example, utilizing the compositions with a reversible crosslinking temperature higher than or equal to 250 C. may improve the recycling ratio of PCB, therefore reducing the CO.sub.2 emission amounts. In addition, the recycled compositions can be repeatedly used as the insulation resin during fabricating PCB or sub-quality raw material for achieving the circular economy.

[0052] It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.