Polyamides incorporating phosphine oxide groups. II. Aromatic polymers containing sulfone functionality

✍ Scribed by Yuehua Zhang; John C. Tebby; John W. Wheeler

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 584 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199702)35:3<493::aid-pola12>3.0.co;2-j

✦ Synopsis

novel polyamides have been prepared in high yields by the polycondensation reactions of bis(;~-carboxypheny l)-and bis(4-carboxypheny l)phenylphosphine oxide with 3,3'-and 4,4'-diaminodipheny lsulfone. 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. C,lass 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 8000(' (20-34% ). Also, good volubility in polar aprotic solvents was observed for all polyamides together with some volubility in aqueous solvent mixtures, e.g. tetrahydrofuran/water (95 : 5). c ]997 John Wiley & Sons, Inc. Keywords: phosphine oxide q diary lsulfone q polyamide q polycondensation q thermal properties Journal o! I>d>mer Science l%! A, P(iwner ('he n)jstrv, V(J 3.',, 49:{ 497 11997) II I!WT John WLle\ & S,m.. [n. ('('{ (lw7-l+24x /9?/(K104Y)-05°R