Synthesis and properties of novel aromatic poly9thioether-ketone)s as sulfur-containing high-performance polymers

摘要

Novel aromatic poly(thioet;her-ketone)s (PTI￡Ks) bearing the 2,6-dimethyl-1,5-naphthylene units were synthesized by the polycc’ndensation of aromatic dihaloketones and aromatic dithiols in the presence of K2C03. PTEKs with molecular weight (M_n approx 65 000, M_w approx 350 000) were obtained in quantitative yields. The molecular weights and yields of PTEKs obtained from aromatic dichloroketone and aromatic dithiols were much higher than those of the corresponding poly(ether-ketone)s (PEKMINs) obtained from aromatic dichloroketone and biphenols and were nearly the same as those of PTEKs obtained from aromatic difluoroketone and aromatic dithiols. The effect of reaction conditions on yield and molecular weight of PTEKs was investigated. The PTEKS had high solubility in ordinary organic solvents. Flexible, transparent, and strong films were cast from CHCl3 solution. PTEK-1 and PTEK-2 had high glass transition temperatures (T_g; PTEK-1 245deg C, PTEK-2 215deg C) and 5% weight loss temperatures (Td5; PTEK-1 435deg C, PTEK-2 436deg C).