Effect of temperature and water as additive on the MW and thermal properties of copoly(p-phenylene/biphenylene sulfide)s

✍ Scribed by Lee Soon Park; Soo Chang Lee; Je Ill Nam

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 392 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199608)34:11<2117::aid-pola4>3.0.co;2-w

✦ Synopsis

Copoly(p-phenylene/biphenylene sulfide)s, PPBS were prepared from sodium sulfide trihydate(Na,S . 3H20), p-dichlorobenzene (DCB), and 4,4'-dibromobiphenyl (DBB) comonomers in N-methyl-2-pyrrolidinone (NMP) solvent using an autoclave. The molecular weights of PPBS copolymers were determined by high temperature (210°C) GPC in 1chloronaphthalene solvent. The reaction temperature had little effect on the molecular weights of PPBS copolymers with water as additive at the level of 3 mol H 2 0 per 1 mol Na,S. PPBS copolymer, however, showed maximum molecular weight of M , = 24.1 X lo3 with the total water content of 9 mol H 2 0 per 1 mol Na2S at an optimum polymerization temperature of 270OC. The resulting PPBS copolymer sample showed higher Tg (by 30°C) and lower T,,, (by 10°C) than PPS homopolymer prepared under similar conditions. 0 1996