Polyarylene sulfide and a preparation method thereof

Abstract

The present invention relates to a polyarylene sulfide having more improved miscibility with other polymer materials or fillers, and a method of preparing the same. At least part of end groups of the main chain of the polyarylene sulfide is carboxyl group (—COON) or amine group (—NH2).

1 - 19 . (canceled) 
     
     
         20 . A method of preparing a polyarylene sulfide, including:
 melt-polymerizing a reactant including a diiodoaromatic compound and elemental sulfur; and   adding a compound having carboxyl group while carrying out the melt-polymerization,   wherein the compound having carboxyl group is added thereto when the degree of the polymerization reaction is progressed 90% or more, wherein the degree of polymerization reaction is determined by the ratio of present viscosity to target viscosity.   
     
     
         21 . The method of  claim 20 , wherein in the polyarylene sulfide, at least part of end groups of the main chain is carboxyl group (—COOH), and the remainder of the end groups is iodine group or unsubstituted aryl group. 
     
     
         22 . The method of  claim 20 , wherein an FT-IR spectrum of the polyarylene sulfide shows a first peak between 1400 and 1600 cm −1  and a second peak between 1600 and 1800 cm −1 , wherein a height intensity of the second peak is between about 0.5% and about 10% of a height intensity of the first peak. 
     
     
         23 . The method of  claim 20 , wherein the compound having carboxyl group includes one or more compounds selected from the group consisting of 2-iodobenzoic acid, 3-iodobenzoic acid, 4-iodobenzoic acid, and 2,2′-dithiobenzoic acid. 
     
     
         24 . The method of  claim 20 , wherein the compound having carboxyl group is added thereto in the amount of 0.0001 to 5 parts by weight, based on 100 parts by weight of the diiodoaromatic compound. 
     
     
         25 . The method of  claim 20 , wherein the diiodoaromatic compound is one more compounds selected from the group consisting of diiodobenzene, diiodonaphthalene, diiodobiphenyl, diiodobisphenol, and diiodobenzophenone. 
     
     
         26 . The method of  claim 20 , wherein the melt-polymerization is carried out for 1 to 30 hours by varying the temperature and pressure from the initial reaction condition of 180 to 250° C. and 50 to 450 torr to the final reaction condition of 270 to 350° C. and 0.001 to 20 torr. 
     
     
         27 . The method of  claim 20 , further including melt-mixing the reactant including the diiodoaromatic compound and sulfur element, before the melt-polymerization.