HEXAFLUOROISOPROPOXY-CONTAINING POLYESTERS

A series of new polyesters containing the hexafluoro-2-propoxy group w as synthesized by solution polycondensation. The 4-(2-hydroxyhexafluor o-2-propyl)benzoyl chloride was synthesized by dichromate oxidation of commercial available 4-(2-hydroxyhexafluoro-2-propyl)toluene and subs equent reaction with SOCl2. The homopolyester of this acid chloride as well as several copolyesters of 1,3- and 1,4-bis(2-hydroxyhexafluoro- 2-propyl)benzene were synthesized. These highly crystalline polyesters show limited solubility in common organic solvents but are all solubl e in dimethylacetamide-LiCl. Inherent viscosities ranged from 0.12 to 0.85 dl g(-1). All of the polyesters showed similar thermal stabilitie s, exhibited weight loss in a single step and decomposed completely wi th negligible quantity of residue. Copyright (C) 1996 Elsevier Science Ltd.