Preparation and characterization of organosoluble copolyimides based on a pair of commercial aromatic dianhydride and one aromatic diamine, 1,4-bis(4-aminophenoxy)-2-tert-butylbenzene, series

✍ Scribed by Chin-Ping Yang; Huei-Wen Yang

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 145 KB
• Volume: 75
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(20000103)75:1<87::aid-app10>3.0.co;2-r

✦ Synopsis

A series of copolyimides (co-PIs) with high molecular weights, excellent mechanical properties, heat-resistant properties, and good solubilities in organic solvents were synthesized from six kinds of commercial dianhydrides (IIa-f) and 1,4-bis(4aminophenoxy)-2-tert-butylbenzene (I). Monomers (IIa-d) for synthesizing insoluble PIs and monomers (IIe,f) for synthesizing soluble PIs were used to synthesize co-PIs with arbitrary solubilities. Nine kinds of soluble co-PIs (IIIa-e and IVa-d) were synthesized through chemical or thermal cyclodehydration. These co-PIs were found to be easily soluble as well as able to be processed by casting from their solutions such as NMP, DMAc, m-cresol, pyridine, THF, and CH 2 Cl 2 . The easily dissolved characteristics of this series of co-PIs stemmed from the t-butyl group and ether group within I. Besides, when the used dianhydride molecules contained the organosoluble groups, the solubilities in organic solvents could be greatly enhanced. The co-PIs could improve the processability of polymers, while increasing their flexible mechanical properties and maintaining their excellent heat-resistant properties.