Abstract
Abstract Poly(quinazolone-imide)s (III) were prepared from poly(quinazolone-amic acid)s (II), which were obtained from pyromellitic dian-hydride (PMDA), benzophenonetetracarboxylic acid dianhydride (BTDA), or 1,2,3,4-butanetetracarboxylic dianhydride (BTCA), and diaminoquinazolones (I). the latter were synthesized from 6, 6′-methylenebis(2-methylbenzoxazin-4-one) and various other aromatic diamines. Many of the resulting films of III were flexible and tough. the electrical, mechanical, and thermal properties of these polymer films were determined. the glass-transition temperatures of III obtained from PMDA and BTDA were 265-323°C, i.e., higher than the Tg of polyquinazolone, and lower than that of polyimide. It has been found that the bisquinazolone structure is more effective than imide in decreasing Tg. Comparison of III obtained from PMDA and BTDA showed the former to have higher Tg. It is evident from the mechanical strength results, thermogravimetric analysis, and IR spectra that bisquinazolone structure is less resistant toward thermal oxidation than the imide unit.
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