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Abstract
Four novel polyamides have been prepared in high yields by the polycondensation reactions of bis(3-carboxyphenyl)- and bis(4-carboxyphenyl)phenylphosphine oxide with 3,3'- and 4,4'-diaminodiphenylsulfone. The thermal properties of these materials were studied using differential scanning calorimetry and thermogravimetric analysis. It was found that the presence of both phosphine oxide and sulfonyl groups within the polymer backbone brought about remarkable modifications in the thermal behavior. Glass transition temperatures 40-50°C lower than those of conventional polyamides i.e., in the range 170-200°C, were recorded. However, we observed greater thermooxidative stability (5% weight loss at >410°C) and high char yield upon prolonged heating at 800°C (20-34%). Also, good solubility in polar aprotic solvents was observed for all polyamides together with some solubility in aqueous solvent mixtures, e.g. tetrahydrofuran/water (95:5).
Published Version
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Schedule a callMore From: Journal of Polymer Science Part A: Polymer Chemistry
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