Polyarylene sulfide resin composition and formed article

A polyarylene sulfide resin composition, including a polyarylene sulfide including a disulfide repeating unit in the repeating units of the main chain and having a target viscosity;

• and at least one component selected from the group consisting of a thermoplastic resin, a thermoplastic elastomer, and a filler,
• wherein the polyarylene sulfide includes carboxyl group (—COOH) bonded to at least part of end groups of the main chain,
• wherein the polyarylene sulfide is prepared by a method comprising the steps of:
• (a) melt-polymerizing a reactant comprising a diiodoaromatic compound and elemental sulfur while adding a polymerization inhibitor, and (b) adding a compound having a carboxyl group only when a degree of polymerization of the melt-polymerizing step as determined by a ratio of present viscosity to the target viscosity is at least about 90% to 95%;
• and
• wherein an FT-IR spectrum of the polyarylene sulfide shows a first peak between 1400 cm and 1600 cm−1 and a second peak between 1600 cm 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.