Synthesis and characterization of novel benzhydrol-containing poly(amide-imide)s

✍ Scribed by Liaw, Der-Jang; Liaw, Been-Yang; Sillion, Bernard; Mercier, Régis; Thiria, Remi; Sekiguchi, Hikaru

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 96 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199906)48:6<473::aid-pi173>3.0.co;2-j

✦ Synopsis

A series of novel benzhydrol-containing poly(amide-imide)s (PAIs) have been prepared from a new diimide-dicarboxylic acid, N,N'-bis(4-hydroxycarbonyl)-benzhydrol-3,3',4,4'-tetracarboxydiimide (BHTDA-DIA), with various diamines by direct polycondensation using triphenyl phosphite and pyridine as condensing agents. The polymers obtained had inherent viscosities of 0.35± 0.96 dl g À1 . All these PAIs, except polymer PAI-2, were soluble in N-methyl-2-pyrrolidinone and N,Ndimethylacetamide containing LiCl (1 wt%). Tough and ¯exible PAI ®lms could be obtained by casting PAIs from their DMAc or NMP solutions, except for polymer PAI-2. The polymer ®lms had a tensile strength of 93±111 MPa, an elongation at break range of 4±6%, and an initial modulus range of 2.7± 3.8 GPa. The glass transition temperatures of most polymers were found to be above 255 °C. These polymers were fairly stable up to a temperature around or above 400 °C, and lost 10% weight in the range 426±507 °C in nitrogen and 423±515 °C in air.