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- Title
Effects of 3,4′-oxydianiline on the structures and properties of a novel aromatic polyimide foam.
- Authors
Li, Yin; Liu, Xiao-Yan; Zhan, Mao-Sheng; Wang, Kai
- Abstract
Aiming at the low volumetric shrinkage, a novel aromatic polyimide foam is successfully prepared from polymethane polyphenyl isocyanate (PAPI) and a poly(amic-acid) precursor which has been synthesized from 3,4′-oxydianiline (3,4′-ODA) and pyromellitic dianhydride (PMDA). In this research, five polyimide foams, with different contents of 3,4′-ODA, are comparatively studied including structural, thermal, mechanical, shrink, and degradation properties. The results indicate that the content of 3,4′-ODA has minor influence on chemical structures, but significant influence on cell structures of the foams. With the increase of 3,4′-ODA, the volumetric shrinkages, apparent densities and the compressive and flatwise tensile strengths of the materials decrease. The glass transition temperatures ( T g) decrease from 301°C to 279°C, and the 5% weight loss temperatures ( T5%) increase from 323°C to 340°C. Through TG-FTIR analysis, we can observe that the addition of 3,4′-ODA has no influence on the pyrolysis mechanism of polyimide foams. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
- Subjects
POLYIMIDES; ISOCYANATES; THERMOPHYSICAL properties; MECHANICAL behavior of materials; PYROLYSIS; CHEMICAL reactions
- Publication
Journal of Applied Polymer Science, 2012, Vol 125, Issue 5, p4128
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.35683