Synthesis and properties of poly(amide-imide)s based on the diimide-diacid condensed from 2,2′- bis(4-aminophenoxy)biphenyl and trimellitic anhydride

✍ Scribed by Chin-Ping Yang; Shu-Huei Jeng; Guey-Sheng Liou

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 171 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199805)36:7<1169::aid-pola14>3.0.co;2-5

✦ Synopsis

A new dicarboxylic acid having a kinked structure was synthesized from the condensation of 2,2 -bis (4-aminophenoxy ) biphenyl and trimellitic anhydride. A series of biphenyl-2,2 -diyl-containing aromatic poly ( amide-imide ) s having inherent viscosities of 0.23 -0.94 dL / g was prepared by the triphenyl phosphite activated polycondensation from the diimide-diacid II with various aromatic diamines in a medium consisting of N-methyl-2-pyrrolidone ( NMP ) , pyridine, and calcium chloride. Most of the resulting polymers showed an amorphous nature and were readily soluble in a variety of organic solvents including NMP and N,N-dimethylacetamide ( DMAc) . Transparent, flexible, and tough films of these polymers could be cast from DMAc or NMP solutions. The glass transition temperatures of these polymers were in the range of 227 -261ЊC and the 10% weight loss temperatures were above 520ЊC in nitrogen.