Abstract
A diamine monomer II, 2,5-bis(4-aminophenoxy)biphenyl, was prepared through a nucleophilic substitution reaction of phenylhydroquinone and p-chloronitrobenzene in the presence of potassium carbonate in N,N-dimethylformamide, followed by catalytic reduction with hydrazine and Pd/C. A series of all-aromatic, organosoluble polyimides bearing pendent phenyl groups were synthesized from the diamine with six kinds of commercial dianhydrides via a conventional two-stage process. For improving solubility of polypyromellitimide, copolypyromellitimides with arbitrary solubilities were prepared from II and a pair of dianhydrides, which were mixed at certain molar ratios. These polymers showed good solubilities in N-methyl-2-pyrrolidone and m-cresol. The softening temperatures of these polyimides were recorded between 206 and 269 °C. Polymers had glass-transition temperatures at 230–286 °C and 10% weight-loss temperatures above 521 °C in air or nitrogen atmospheres. Their films had high tensile moduli and strengths. Excellent properties of these polyimides are attributed to the incorporation of the pendent phenyl group in diamine II. © 2002 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 429–438, 2002; DOI 10.1002/pola.10116
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More From: Journal of Polymer Science Part A: Polymer Chemistry
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