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Aromatic polybenzoxazoles bearing ether and isopropylidene or hexafluoroisopropylidene units in the main chain
Author(s) -
Hsiao ShengHuei,
Yu ChouHuan
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980701)199:7<1247::aid-macp1247>3.0.co;2-y
Subject(s) - ether , condensation polymer , polymer chemistry , phenylene , chemistry , chloride , thermal stability , glass transition , diphenyl ether , nitrogen , organic chemistry , polymer
A series of poly( o ‐hydroxyamide)s having high molecular weights were synthesized by means of low‐temperature solution polycondensation of 4,4′‐[isopropylidenebis(1,4‐phenylene)dioxy]dibenzoyl chloride ( 1 ) and 4,4′‐[hexafluoroisopropylidenebis(1,4‐phenylene)dioxy]dibenzoyl chloride ( 2 ) with three bis( o ‐aminophenol)s. Subsequent thermal cyclodehydration of the poly( o ‐hydroxyamide)s afforded polybenzoxazoles. All poly( o ‐hydroxyamide)s are readily soluble in a variety of solvents, whereas the polybenzoxazoles are insoluble with one exception. The polybenzoxazoles exhibit glass transition temperatures in the range of 218–231°C and are stable up to 500°C in air or nitrogen, with the 10% weight loss temperatures being recorded between 553–607°C in nitrogen.