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Synthesis of a hyperbranched polyether epoxy through one-step proton transfer polymerization and its application as a toughener for epoxy resin DGEBA

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Abstract

A novel liquid hyperbranched polyether epoxy (HBPEE) based on commercially available hydroquinone (HQ) and 1,1,1-trihydroxymethylpropane triglycidyl ether (TMPGE) was synthesized through an A2 + B3 one-step proton transfer polymerization. In order to improve the toughness, the synthesized HBPEE was mixed with diglycidyl ether of bisphenol A (DGEBA) in different ratios to form hybrids and cured with triethylenetetramine (TETA). Thermal and mechanical properties of the cured hybrids were evaluated. Results show that addition of HBPEE can improve the toughness of cured hybrids remarkably at < 20 wt% loading, without compromising the tensile strength. However, the glass transition temperature (T g) of the cured hybrids decreases with increasing HBPEE content. Fracture surface images from scanning electron microscope show oriented fibrils in hybrids containing HBPEE. The formation and orientation of the fibrils can absorb energy under impact and lead to an improvement of toughness. Furthermore, based on the morphology of fractured surfaces and the single T g in each hybrid, no sign of phase separation was found in the cured hybrid systems. As a result, the toughening mechanism could be explained by in situ homogeneous toughening mechanism rather than phase separation mechanism.

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Authors and Affiliations

  1. State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Jian-yong Lv & Hai-qiao Wang  (王海侨)

  2. Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China

    Yan Meng, Li-fan He, Xiao-yu Li  (李效玉) & Hai-qiao Wang  (王海侨)

Authors
  1. Jian-yong Lv
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  2. Yan Meng
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  3. Li-fan He
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  4. Xiao-yu Li  (李效玉)
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  5. Hai-qiao Wang  (王海侨)
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Corresponding authors

Correspondence to Xiao-yu Li  (李效玉) or Hai-qiao Wang  (王海侨).

Additional information

This work was financially supported by the Natural Science Foundation of Beijing (No. 2092023), National Natural Science Foundation of China (No. 51173012) and the Fundamental Research Funds for the Central Universities (No. ZZ0912).

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Lv, Jy., Meng, Y., He, Lf. et al. Synthesis of a hyperbranched polyether epoxy through one-step proton transfer polymerization and its application as a toughener for epoxy resin DGEBA. Chin J Polym Sci 30, 493–502 (2012). https://doi.org/10.1007/s10118-012-1166-7

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  • DOI: https://doi.org/10.1007/s10118-012-1166-7

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