Synthesis and properties of new organo-soluble and strictly alternating aromatic poly(ester-imide)s from 3,3-bis[4-(trimellitimidophenoxy)phenyl]phthalide and bisphenols

✍ Scribed by Chin-Ping Yang; Guey-Sheng Liou; Ruei-Shin Chen; Ching-Yne Yang

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 182 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(20000401)38:7<1090::aid-pola6>3.0.co;2-p

✦ Synopsis

A series of new strictly alternating aromatic poly(ester-imide)s having inherent viscosities of 0.20 -0.98 dL/g was synthesized by the diphenylchlorophosphate (DPCP) activated direct polycondensation of the preformed imide ring-containing diacid, 3,3-bis[4-(trimellitimidophenoxy)phenyl]phthalide (I), with various bisphenols in a medium consisting of pyridine and lithium chloride. The diimide-diacid I was prepared from the condensation of 3,3-bis[4-(4-aminophenoxy)phenyl]phthalide and trimellitic anhydride. Most of the resulting polymers showed an amorphous nature and were readily soluble in a variety of organic solvents such as N-methyl-2-pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc). Transparent and flexible films of these polymers could be cast from their DMAc solutions. The cast films had tensile strengths ranging 66 -105 MPa, elongations at break from 7-10%, and initial moduli from 1.9 -2.4 GPa. The glass-transition temperatures of these polymers were recorded between 208 -275 °C. All polymers showed no significant weight loss below 400 °C in the air or in nitrogen, and the decomposition temperatures at 10% weight loss all occurred above 460 °C.