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The application of highly soluble amine-terminated aromatic polyimides with pendent tert-butyl groups as a tougher for epoxy resin

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Abstract

Polyimides (PIs) with various molecular weights synthesized via the reaction of aromatic diamine monomer containing tert-butyl groups with aromatic dianhydride were highly soluble in common organic solvents and some epoxy resins at room temperature. These PIs can be incorporated in the absence of organic solvent into epoxy resin E51 with the loading below 2 wt% forming EP-PI composites. No phase separation is observed by SEM on cryogenically fractured surfaces of EP-PI composites. The PI can improve mechanical properties, especially impact strength. Adding 2 wt% PI-1.5W, the impact strength reaches to 55 kJ/m2 with the increase in tensile and flexural strengths by 14% and 3%, respectively. SEM analyses for the fracture surface suggest that PI reduces the crosslink density, improves the plasticity of epoxy resin and changes the mode of fracture from fragile to ductile. Moreover, the glass transition temperature of EP-PI composites was found to increase to a significant extent.

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Authors and Affiliations

  1. Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, China

    Qing Zhao & Xing-yi Wang  (王幸宜)

  2. Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Yan-hong Hu  (扈艳红)

Authors
  1. Qing Zhao
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  2. Xing-yi Wang  (王幸宜)
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  3. Yan-hong Hu  (扈艳红)
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Corresponding authors

Correspondence to Xing-yi Wang  (王幸宜) or Yan-hong Hu  (扈艳红).

Additional information

Electronic Supplementary Material Supplementary material is available in the online version of this article at http://dx.doi.org/10.1007/s10118-015-1685-0.

This work was financially supported by the Shanghai key R&D Program ( No. DZ1100105).

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Zhao, Q., Wang, Xy. & Hu, Yh. The application of highly soluble amine-terminated aromatic polyimides with pendent tert-butyl groups as a tougher for epoxy resin. Chin J Polym Sci 33, 1359–1372 (2015). https://doi.org/10.1007/s10118-015-1685-0

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  • DOI: https://doi.org/10.1007/s10118-015-1685-0

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