An organic frame material having zinc containing isopoly-molybdic acid metal, a method of manufacturing the same, and the application thereof are provided. The organic frame material having zinc containing isopoly-molybdic acid metal includes a three-dimensional network structure in which the zinc ions coordinate with 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene ligands and trinuclear molybdate anions. The organic frame material having zinc containing isopoly-molybdic acid metal exhibits high catalytic activity, thermal stability, low toxicity, ease of synthetization and use, and strong reproducibility.

An organic frame material having a cobalt-containing isopoly-molybdic acid metal, a method of manufacturing the same, and applications thereof are provided. The organic frame material having a cobalt-containing isopoly-molybdic acid metal includes a three-dimensional network structure comprising cobalt ions coordinated with 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene ligands and trinuclear molybdate anions. The organic frame material having a cobalt-containing isopoly-molybdic acid metal has higher catalytic activity towards the bulk ring-opening of p-dioxanone. The resulting poly(p-dioxanone) has a weight average molecular weight exceeding 70,000 and is capable of being applied in the field of high polymer materials.

An object of the present disclosure is to provide a method for producing an aliphatic polyester resin which substantially does not contain impurities, such as metals, and which has high molecular weight, particularly a polylactic acid having high molecular weight and high optical purity. The method for producing an aliphatic polyester resin of the present disclosure has a step of contacting a solution containing a cyclic ester with a cyclic amine catalyst and a polymerization initiator to initiate a reaction, a step of conducting the reaction by flow-type polymerization, and a step of subjecting the product obtained in the flow-type polymerization to further reaction by postpolymerization by stirring.

Provided is a copolymer comprising an irregularly arranged structure of a repeating unit of the following Chemical Formula 1 and a repeating unit of the following Chemical Formula 2, and a repeating unit of the following Chemical Formula 3 present at least at one end of the structure:

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and is characterized by having an improved elongation and also having a high weight average molecular weight while maintaining intrinsic properties of a polylactic acid. Also provided are methods of preparing the copolymer.

A method for preparing high molecular weight poly(L-lactic acid) with high performance, including: a) providing a biogenic guanidine (BG) as a catalyst, and a nontoxic acid salt of an essential metal trace element as an activator (Act), and adding the catalyst, the activator, and L-lactide monomer to a polymerization reactor; b) evacuating under vacuum and charging the polymerization reactor with nitrogen for three consecutive times to remove air, and allowing the L-lactide monomer to undergo bulk polymerization under vacuum. The bulk polymerization includes a first reaction stage and a second reaction stage, which are separately carried out at different temperatures, pressures, and reaction times.

The present invention relates to a process for the preparation of a block copolymer comprising a first type of polyolefin block and at least one type of second polymer block, the process comprising the steps of: A) polymerizing at least one type of olefin monomer using a catalyst system to obtain a first polyolefin block containing a main group metal on at least one chain end; the catalyst system comprising: i) a metal catalyst or metal catalyst precursor comprising a metal from Group 3-10 of the IUPAC Periodic Table of elements; and ii) at least one type of chain transfer agent; and iii) optionally a co-catalyst; B) reacting the first polyolefin block containing a main group metal on at least one chain end obtained in step A) with at least one type of oxidizing agent and subsequently at least one type of metal substituting agent to obtain a first polyolefin block containing at least one functionalized chain end; C) forming at least one second polymer block on the first polyolefin block, wherein as an initiator the functionalized chain end of the first polyolefin block obtained in step B) is used to obtain the block copolymer.

An isopoly-molybdic acid coordination polymer catalyst for manufacturing polycaprolactone and method of manufacturing the same are provided. It relates to a field of catalysts from polycaprolactone. The chemical formula of the isopoly-molybdic acid coordination polymer catalyst is [Cu.sub.2(trz).sub.2(γ-Mo.sub.8O.sub.26).sub.0.5(H.sub.2O).sub.2]. In the chemical formula, trz is 1,2,4-triazole negative monovalent anion, and [γ-Mo.sub.8O.sub.26] is a γ type octamolybdate anion. This synthesis method offers higher yield with strong reproducibility. The resulting crystal products have higher purity. The isopoly-molybdic acid coordination polymer catalyst shows high catalytic activity towards the bulk ring-opening polymerization of caprolactone. The resulting polycaprolactone has a weight average molecular weight exceeding 50,000 and a narrow molecular distribution. The polycaprolactone has great potential in the application of low- to medium-temperature thermoplastic medical materials.

An isopoly-vanadic acid coordination polymer catalyst, method of manufacturing the same, and application thereof are provided. The isopoly-vanadic acid coordination polymer catalyst has a chemical formula of [Co(atrz)(V.sub.2O.sub.6)]. The atrz is a 4-amino-1,2,4-triazole ligand, and [V.sub.2O.sub.6] is a binuclear vanadate anion. The isopoly-vanadic acid coordination polymer catalyst shows strong thermal stability, and it is easy to synthesize with high reproducibility. The isopoly-vanadic acid coordination polymer catalyst has a good catalytic activity towards the bulk ring-opening of p-dioxanone. The resulting poly(p-dioxanone) is stable and uniform. The high molecular weight of the resulting poly(p-dioxanone) has great potential in high polymer materials, in particular the field of medical high polymer materials.

The present invention relates to the technical field of the production of polylactic acid, and in particular to a production method for preparing polylactic acid by means of a ring-opening polymerization method, and a prepolymer mixture and the polylactic acid. The production method comprises: (1) enabling an initiator, a catalyst and a monomer I to be in contact in a production device to undergo a ring-opening polymerization reaction, so as to generate a prepolymer mixture containing a polylactic acid prepolymer; and (2) enabling the prepolymer mixture and a monomer II to be in contact with one another to undergo a reaction, so as to generate a high molecular weight polylactic acid. The monomer I and the monomer II are the same or are different, and each independently comprises lactide. The production method provided by the present invention can reduce the fluctuation in the feeding quality of the initiator and the catalyst, and can improve the production stability during the production process.

An organic frame material having isopoly-molybdic acid metal for manufacturing polylactic acid and method of manufacturing the same is provided. The chemical formula of the organic frame material having isopoly-molybdic acid metal is [Cu(tfbtb).sub.0.5(β-Mo.sub.8O.sub.26)0.5(H.sub.2O)]. tfbtb is a 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene ligand, and [β-Mo.sub.8O.sub.26] is a β type octamolybdate anion. Sodium molybdate dihydrate, copper salt and organic ligand 2,3,5,6-tetrafluoro-bis (1,2,4-triazole-1-methyl) benzene undergo hydrothermal reaction in a closed condition to form the organic frame material having copper containing isopoly-molybdic acid metal that has a three-dimensional structure. The synthesis method is simple with high yield and reproducibility. The organic frame material having isopoly-molybdic acid metal shows high catalytic activity towards the ring-opening polymerization of lactide. The resulting polylactic acid has a weight average molecular weight exceeding 60,000. The polylactic acid has great potential in the fields of packaging materials and medical high polymer materials.