Polyamides incorporating phosphine oxide groups: IV. Aromatic–aliphatic polymers

• Published in: European polymer journal Vol. 35; no. 2; pp. 209 - 214
• Main Authors: Zhang, Yuehua, Tebby, John C., Wheeler, John W.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.1999; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Inorganic and organomineral polymers; Physicochemistry of polymers; Preparation; Tertiary phosphine oxide; Nylon; Solution polycondensation; Preparation; Aromatic polymer; Soluble compound; Experimental study; Thermal stability; Phosphorus polymer
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/S0014-3057(98)00119-0

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 ( T g) 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 T g 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 (CH 2) 5 and (CH 2) 6 units within the polymer backbone were partially soluble (0.1–1.0%) in several common organic solvents, such as chloroform and acetone.