Abstract
Synthesis of poly-p-phenylenesulfone (PPS) from 1, 3-cyclohexadiene (1, 3-CHD) polysulfone has been studied.
PPS was obtained both by 1) pyrolysis of brominated 1, 3-CHD polysulfone and 2) dehydrobromination of reaction product obtained from 1, 3-CHD polysulfone with N-bromosuccimide (NBS).
Dehydrobromination (1) by LiCl-dimethylformamide system took place efficiently, however, in radical reaction (pyrolysis (1) and substitution by NBS) degradation of polymers seemed to occur to some extent.
Infrared spectra of PPS obtained by both methods show a intensive peak at 810cm-1 which is assigned para-substituted aromatic compounds. PPS obtained by (1) was black, while one by (2) was yellow. And those were resistant to aqueous alkali solution (10% NaOH) and exhibited considerably good thermal stability till about 300°C, but those were insoluble in ordinary solvents.
