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Hybrid cationic ring-opening polymerization of epoxy resin/glycidyloxypropyl-polyhedral oligomeric silsesquioxane nanocomposites and dynamic mechanical properties

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Abstract

Glycidyloxypropyl-polyhedral oligomeric silsesquioxanes (G-POSS) were prepared from 3-glycidyloxypropyl-trimethoxysilane (GTMS) by hydrolytic condensation. The hybrid cationic thermal polymerization of G-POSS with bisphenol A epoxy resin (E-51) using diphenyliodonium fluoride borate (DPI·BF4) as a cationic initiator and benzoyl peroxide (BPO) as a co-initiator was investigated by DSC and FTIR. The structure of G-POSS was characterized by liquid chromatography–mass spectrometry (LC/MSD), FTIR and NMR. The effect of BPO content on reaction system, the distribution of G-POSS in the curing system, curing reaction activation energy E a and dynamic mechanical properties of the E51/G-POSS nanocomposites were characterized. The results showed that octa(3-glycidyloxypropyl)-POSS (G-POSS) had been synthesized and displayed uniform dispersion in E51/G-POSS curing system. The DPI·BF4, which was capable to initiate the thermal ring-opening curing of epoxy resin, showed an initial curing temperature of epoxy resin decreased by 54.7 °C when the added amount of BPO was 2 wt%. The reaction process was well accorded with Kissinger’s kinetics model, and the average curing reaction activation energy E a was increased as the content of G-POSS increased. The T g and storage modulus of the E-51/G-POSS nanocomposites reached its optimum when the content of G-POSS was 2 wt%. The T g of nanocomposite was 8.3 °C higher than that of the pure epoxy resin. The T g and storage modulus decreased with the further increasing of G-POSS content.

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Acknowledgments

The authors gratefully acknowledge the financial support of the Nature Science Foundation (No: E2007000204) and High Level Talents Foundation (No. A201400504) of Hebei Province, China.

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Authors and Affiliations

  1. College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, People’s Republic of China

    Guixiang Hou, Na Li, Hongzhe Han, Li Huo & Jungang Gao

  2. College of Materials Science and Engineering, Hebei United University, Tangshan, 063009, China

    Guixiang Hou

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  1. Guixiang Hou
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  2. Na Li
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Correspondence to Guixiang Hou.

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Hou, G., Li, N., Han, H. et al. Hybrid cationic ring-opening polymerization of epoxy resin/glycidyloxypropyl-polyhedral oligomeric silsesquioxane nanocomposites and dynamic mechanical properties. Iran Polym J 24, 299–307 (2015). https://doi.org/10.1007/s13726-015-0321-8

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  • DOI: https://doi.org/10.1007/s13726-015-0321-8

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