A method for preparing a compound and a method for preparing a polymer employing the same are provided. The method for preparing a compound includes reacting a compound having a structure represented by Formula (I) with a compound having a structure represented by Formula (III) in the presence of a compound having a structure represented by Formula (II) to obtain a compound having a structure represented by Formula (IV)

##STR00001##

wherein Ar.sup.1 is substituted or unsubstituted aryl group; X is O, S, or NH; R.sup.1 is independently hydrogen or C.sub.1-6 alkyl group; R.sup.2 is hydroxyl group, C.sub.1-6 alkyl group, phenyl group, or tolyl group; and R.sup.3 is independently C.sub.1-6 alkyl group, C.sub.5-8 cycloalkyl group, or C.sub.2-6 alkoxyalkyl group.

A method for forming a polydisulfide polymer is described. In various implementations, the method includes forming a mixture including one or more thiols, agitating the mixture, precipitating the mixture, and extracting a polydisulfide polymer from the mixture. In various implementations, the polydisulfide polymer has a refractive index of at least 1.7.

The present invention aims to provide a method for producing a sulfur-containing polymer such as polyarylene sulfide which has few by-products in the polymerization reaction and little effect caused by the catalyst residue used, on optical properties or other properties. The present invention relates to a method for producing a sulfur-containing polymer, the method including polymerizing a monomer component containing at least one of a disulfide compound or a thiol compound using a catalyst, the catalyst containing an iron-containing substance, an amount of iron in the iron-containing substance being 50 mol % or less relative to 100 mol % of the monomer component.

Compounds include polythioaminals of the formula: ##STR00001##
Each instance of R may be hydrogen or an electron withdrawing group. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000. Compounds also include polythioaminals of the formula: ##STR00002##
Each instance of R may be independently selected from the group consisting of H, F, CF.sub.3, and NO.sub.2. Each instance of R may be independently selected from the group consisting of cycloalkyl, alkyl, alkylene glycol, acrylate, and siloxane. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000.

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.

Compounds include polythioaminals of the formula:

##STR00001##

Each instance of R may be hydrogen or an electron withdrawing group. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000. Compounds also include polythioaminals of the formula:

##STR00002##

Each instance of R may be independently selected from the group consisting of H, F, CF.sub.3, and NO.sub.2. Each instance of R may be independently selected from the group consisting of cycloalkyl, alkyl, alkylene glycol, acrylate, and siloxane. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000.

Compounds include polythioaminals of the formula: ##STR00001## Each instance of R may be hydrogen or an electron withdrawing group. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000. Compounds also include polythioaminals of the formula: ##STR00002## Each instance of R may be independently selected from the group consisting of H, F, CF.sub.3, and NO.sub.2. Each instance of R may be independently selected from the group consisting of cycloalkyl, alkyl, alkylene glycol, acrylate, and siloxane. n may be an integer such that the number average molecular weight (Mn) or weight average molecular weight (Mw) is between about 2,000 to about 80,000.

A method for forming a polydisulfide polymer is described. In various implementations, the method includes forming a mixture including one or more thiols, agitating the mixture, precipitating the mixture, and extracting a polydisulfide polymer from the mixture. In various implementations, the polydisulfide polymer has a refractive index of at least 1.7.