A facile synthesis of soluble polyimides with high glass transition temperature and excellent mechanical properties due to intermolecular hydrogen bonds. (April 2020)

• Record Type: Journal Article
• Authors: Li, Ke; Zhou, Lan; Wu, Simin; Yu, Qiyu; Yang, Long
• Is Part Of: High performance polymers. Volume 32:Number 3(2020)
• Page Start: 316
• Page End: 323
• Publication Date: 2020-04
• Subjects: Soluble polyimide -- high glass transition temperature -- excellent mechanical properties; Polymerization -- Periodicals; Polymers -- Periodicals; 547.7
• DOI: 10.1177/0954008319861141
• Languages: English
• ISSNs: 0954-0083

Abstract

An unsymmetrical heterocyclic diamine monomer containing proton donor (–NH–), 2-(4-aminophenyl)-5-aminobenzimidazole (PABZ), which can form hydrogen bond interactions with carbonyl functional group, was copolymerized with 4, 4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2, 2′-bis(trifluoromethyl)-4, 4′-diaminobiphenyl (TFMB) through two-step synthetic methods to obtain a series of homo- and co-polyimide (PI). The corresponding homo- and co-PI both exhibited good solubility in aprotic polar solvents, such as N, N -dimethylacetamide, N -methyl-2-pyrrolidone, N, N -dimethylformamide, pyridine, and dimethyl sulfoxide. In addition, the PI-containing PABZ units showed excellent tensile strength ranging from 83 to 164 MPa, 130–260% higher than 6FDA/TFMB homo-PIa films. These PIs, especially PABZ/6FDA, showed very high glass transition temperatures, 430°C.