Abstract
A series of phosphorus‐containing copolyesters was prepared by polycondensation of 2‐(6‐oxido‐6H‐dibenzo<c,e><1,2>oxaphosphorin‐6‐yl)1,4‐benzenediol, 1 , or of an equimoleculare amount of 1 and different bisphenols 2 , such as: hydroquinone, 4,4′‐(hexafluoroisopropylidene)diphenol, 4,4′‐isopropylidenediphenol, 4,4′‐(1,4‐phenylene‐diisopropylidene)bisphenol, 2,7‐dihydroxynaphthalene, 4,4′‐dihydroxybiphenyl, 9,9‐bis‐(p‐hydroxyphenyl)fluorene, with an aromatic diacid chloride containing two preformed ester groups 3 , namely terephthaloyl‐bis‐(4‐oxybenzoyl‐chloride). The copolyesters exhibited thermal stability having the decomposition temperature above 350°C and char yield at 700°C in the range of 19–41%. The glass transition temperature was in the range of 131–164°C. Some of the polymers exhibited thermotropic liquid crystalline behavior.
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