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 (—COOH) or amine group (—NH 2 ).

1 . A polyarylene sulfide of which at least part of end groups of the main chain is carboxyl group (—COOH) or amine group (—NH 2 ). 
     
     
         2 . The polyarylene sulfide according to  claim 1 , showing the peak of 1600 to 1800 cm −1  or 3300 to 3500 cm −1 , in a FT-IR spectrum. 
     
     
         3 . The polyarylene sulfide according to  claim 2 , wherein the relative height intensity of the peak of 1600 to 1800 cm −1  or 3300 to 3500 cm −1  is 0.001 to 10%, when the height of the ring stretch peak shown at 1400 to 1600 cm −1  is assumed as the intensity of 100%, in the FT-IR spectrum. 
     
     
         4 . The polyarylene sulfide according to  claim 1 , wherein the melting temperature is 265 to 290° C. 
     
     
         5 . The polyarylene sulfide according to  claim 1 , wherein the number average molecular weight is 5,000 to 50,000. 
     
     
         6 . The polyarylene sulfide according to  claim 1 , wherein the melt viscosity measured with a rotational viscometer at 300° C. is 10 to 50,000 poise. 
     
     
         7 . The polyarylene sulfide according to  claim 1 , wherein the tensile strength measured according to ASTM D 638 is 100 to 900 kgf/cm 2 . 
     
     
         8 . The polyarylene sulfide according to  claim 1 , wherein the elongation measured according to ASTM D 638 is 1 to 10%. 
     
     
         9 . The polyarylene sulfide according to  claim 1 , wherein the flexural strength measured according to ASTM D 790 is 100 to 2,000 kgf/cm 2 . 
     
     
         10 . The polyarylene sulfide according to  claim 1 , wherein the impact strength measured according to ASTM D 256 is 1 to 100 J/m. 
     
     
         11 . A method of preparing the polyarylene sulfide according to  claim 1 , including the steps of:
 polymerizing a reactant including a diiodoaromatic compound and sulfur element; and   adding a compound having carboxyl group or amine group thereto while carrying out the polymerization step.   
     
     
         12 . The method according to  claim 11 , wherein the compound having carboxyl group or amine group includes one or more compounds selected from the group consisting of 2-iodobenzoic acid, 3-iodobenzoic acid, 4-iodobenzoic acid, 2,2′-dithiobenzoic acid, 2-iodoaniline, 3-iodoaniline, 4-iodoaniline, 2,2′-dithiodianiline, and 4,4′-dithiodianiline. 
     
     
         13 . The method according to  claim 11 , wherein the compound having carboxyl group or amine 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. 
     
     
         14 . The method according to  claim 11 , wherein the compound having carboxyl group or amine 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. 
     
     
         15 . The method according to  claim 11 , wherein the diiodoaromatic compound is one more compounds selected from the group consisting of diiodobenzene, diiodonaphthalene, diiodobiphenyl, diiodobisphenol, and diiodobenzophenone. 
     
     
         16 . The method according to  claim 11 , wherein polymerizing step 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. 
     
     
         17 . The method according to  claim 11 , further including the step of melt-mixing the reactant including the diiodoaromatic compound and sulfur element, before the polymerizing step. 
     
     
         18 . A shaped article, including the polyarylene sulfide according to  claim 1 . 
     
     
         19 . The shaped article according to  claim 19 , which is a form of film, sheet, or fiber.