Effects of 3,4′-oxydianiline on the structures and properties of a novel aromatic polyimide foam

Authors

  • Yin Li,

    1. Ministry of Education Key Laboratory of Aerospace Material and Service, School of Material Science and Engineering, Beihang University, Beijing 100191, China
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  • Xiao-Yan Liu,

    1. Ministry of Education Key Laboratory of Aerospace Material and Service, School of Material Science and Engineering, Beihang University, Beijing 100191, China
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  • Mao-Sheng Zhan,

    Corresponding author
    1. Ministry of Education Key Laboratory of Aerospace Material and Service, School of Material Science and Engineering, Beihang University, Beijing 100191, China
    • Ministry of Education Key Laboratory of Aerospace Material and Service, School of Material Science and Engineering, Beihang University, Beijing 100191, China
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  • Kai Wang

    1. Ministry of Education Key Laboratory of Aerospace Material and Service, School of Material Science and Engineering, Beihang University, Beijing 100191, China
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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 (Tg) 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

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