Add time:08/31/2019         Source:sciencedirect.com

Six novel polyamides, incorporating triarylphosphine oxide groups and aliphatic bridging units, have been prepared. Of these, three were synthesised by a direct melt condensation reaction of bis(4-carboxyphenyl)phenylphosphine oxide (p-BCPPO) with a series of aliphatic diamines. A phosphorylation polycondensation method was used to prepare three polymers from bis[4-(3-aminophenoxy)phenyl] phenylphosphine oxide (m-BAPPO) and a series of aliphatic dicarboxylic acids. The thermal properties of all polyamides were investigated by differential scanning calorimetry and thermogravimetric analysis. Significantly different results were obtained for the two series. Glass transition temperatures (Tg) in the 215–235°C range, together with good thermooxidative stabilities (5% weight loss occurring at >420°C) and high char yields upon prolonged heating at 700°C (40–44%) were observed for the polyamides synthesised from m-BAPPO. The polymers prepared from p-BCPPO incorporated longer aliphatic bridging units and, consequently, demonstrated lower Tg values (184–205°C) and reduced thermooxidative stability (5% weight loss occurring at >370°C). Good solubility in aprotic polar solvents was observed for all polyamides. Additionally, those with (CH2)5 and (CH2)6 units within the polymer backbone were partially soluble (0.1–1.0%) in several common organic solvents, such as chloroform and acetone.

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