A heat-resistant, chemical-resistant polyphenylene sulfide block copolymer containing polyphenylene sulfide units and aromatic polyester units, wherein the polyphenylene sulfide units have a number average molecular weight in the range of 6,000 to 100,000. Provided is a polyphenylene sulfide block copolymer that overcomes the disadvantages of block copolymers including a low-molecular-weight polyphenylene sulfide segment and having poor heat resistance and chemical resistance.

A heat-resistant, chemical-resistant polyphenylene sulfide block copolymer containing polyphenylene sulfide units and aromatic polyester units, wherein the polyphenylene sulfide units have a number average molecular weight in the range of 6,000 to 100,000. Provided is a polyphenylene sulfide block copolymer that overcomes the disadvantages of block copolymers including a low-molecular-weight polyphenylene sulfide segment and having poor heat resistance and chemical resistance.

The present invention relates to a method for manufacturing a polyarylene sulfide resin comprising: reacting a sulfoxide represented by the following formula (1) with a particular aromatic compound to obtain a poly(arylenesulfonium salt) having a particular constitutional unit; and dealkylating or dearylating the poly(arylenesulfonium salt) to obtain a polyarylene sulfide resin having a particular constitutional unit,

##STR00001## wherein R.sup.1 represents an alkyl group having 1 to 10 carbon atoms, etc.; Ar.sup.1 and Ar.sup.2 each independently represent an arylene group optionally having a substituent; and Z represents a direct bond, etc.

The present invention relates to a method for manufacturing a polyarylene sulfide resin comprising: reacting a sulfoxide represented by the following formula (1) with a particular aromatic compound to obtain a poly(arylenesulfonium salt) having a particular constitutional unit; and dealkylating or dearylating the poly(arylenesulfonium salt) to obtain a polyarylene sulfide resin having a particular constitutional unit,

##STR00001## wherein R.sup.1 represents an alkyl group having 1 to 10 carbon atoms, etc.; Ar.sup.1 and Ar.sup.2 each independently represent an arylene group optionally having a substituent; and Z represents a direct bond, etc.

The present invention relates to a method for manufacturing a polyarylene sulfide resin comprising: reacting a sulfoxide represented by the following formula (1) with a particular aromatic compound to obtain a poly(arylenesulfonium salt) having a particular constitutional unit; and dealkylating or dearylating the poly(arylenesulfonium salt) to obtain a polyarylene sulfide resin having a particular constitutional unit, ##STR00001## wherein R.sup.1 represents an alkyl group having 1 to 10 carbon atoms, etc.; Ar.sup.1 and Ar.sup.2 each independently represent an arylene group optionally having a substituent; and Z represents a direct bond, etc.

Disclosed herein are dithiol-based polymers and cyclic compounds that can be formed therefrom. The cyclic compounds also can be used to regenerate recycled polymers. Methods for making native and recycled polymers are described herein, along with methods for using the compounds of the present disclosure to provide crosslinked vitrimer-like products.

Disclosed herein are dithiol-based polymers and cyclic compounds that can be formed therefrom. The cyclic compounds also can be used to regenerate recycled polymers. Methods for making native and recycled polymers are described herein, along with methods for using the compounds of the present disclosure to provide crosslinked vitrimer-like products.