Syntheses and properties of organosoluble polyimides based on 5,5′-bis[4-(4-aminophenoxy)phenyl]-4, 7-methanohexahydroindan

✍ Scribed by Chin-Ping Yang; Jyh-An Chen

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 234 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990601)37:11<1681::aid-pola14>3.0.co;2-7

✦ Synopsis

A series of organosoluble aromatic polyimides (PIs) was synthesized from 5,5Ј-bis[4-(4-aminophenoxy)phenyl]-4,7-methanohexahydroindan (3) and commercial available aromatic dianhydrides such as 3,3Ј,4,4Ј-biphenyltetracarboxylic dianhydride (BPDA), 4,4Ј-oxydiphthalic anhydride (ODPA), 4,4Ј-sulfonyl diphthalic anhydride (SDPA), or 2,2Ј-bis(3,4-dicarboxyphenyl) hexafluoropropanic dianhydride (6FDA). PIs (III c-f ), which were synthesized by direct polymerization in m-cresol, had inherent viscosities of 0.83-1.05 dL/g. These polymers could easily be dissolved in N,NЈ-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), pyridine, m-cresol, and dichloromethane. Whereas copolymerization was proceeded with equivalent molar ratios of pyromellitic dianhydride (PMDA)/6FDA, 3,3Ј,4,4Ј-benzophenonetetracarboxylic dianhydride (BTDA)/6FDA, or BTDA/SDPA, or 1 2 for PMDA/ SDPA, copolyimides (co-PIs), derived from 3 and mixed dianhydrides, were soluble in NMP. All the soluble PIs could form transparent, flexible, and tough films, and they showed amorphous characteristics. These films had tensile strengths of 88 -111 MPa, elongations at break of 5-10% and initial moduli of 2.01-2.67 GPa. The glass transition temperatures of these polymers were in the range of 252-311°C. Except for III e , the 10% weight loss temperatures (T d ) of PIs were above 500°C, and the amount of carbonized residues of the PIs at 800°C in nitrogen atmosphere were above 50%.