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<p>Epoxy resins (EPs) have gained widespread industrial adoption due to their exceptional mechanical properties, chemical resistance, and electrical insulation characteristics. However, their inherent brittleness caused by highly cross-linked networks significantly limits their application under impact loading conditions. This study demonstrates a solvent-free strategy for significantly enhancing the toughness of epoxy resins while maintaining their mechanical strength and thermal stability through incorporation of hyperbranched epoxy resins (HPEs). At an optimal 20 wt% loading, the HPE-modified epoxy system exhibits a remarkable 276% improvement in impact strength with simultaneous enhancement of tensile and flexural properties, accompanied by the reduction in glass transition temperature. Comprehensive characterization reveals that this exceptional performance stems from three synergistic mechanisms: free volume fraction (0.2623% to 0.5708%), stress-induced microvoid formation, and optimized crosslinking via terminal group interactions, offering new insights for developing high-performance epoxy composites through sustainable processing.</p>

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Study on toughening and strengthening of bisphenol a epoxy resin with aromatic polyether type hyperbranched epoxy

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Anzhong Deng,
  • Haoyang Jiang,
  • Na Liu

摘要

Epoxy resins (EPs) have gained widespread industrial adoption due to their exceptional mechanical properties, chemical resistance, and electrical insulation characteristics. However, their inherent brittleness caused by highly cross-linked networks significantly limits their application under impact loading conditions. This study demonstrates a solvent-free strategy for significantly enhancing the toughness of epoxy resins while maintaining their mechanical strength and thermal stability through incorporation of hyperbranched epoxy resins (HPEs). At an optimal 20 wt% loading, the HPE-modified epoxy system exhibits a remarkable 276% improvement in impact strength with simultaneous enhancement of tensile and flexural properties, accompanied by the reduction in glass transition temperature. Comprehensive characterization reveals that this exceptional performance stems from three synergistic mechanisms: free volume fraction (0.2623% to 0.5708%), stress-induced microvoid formation, and optimized crosslinking via terminal group interactions, offering new insights for developing high-performance epoxy composites through sustainable processing.