Cyclic olefin copolymer (COC) is utilized as thermoplastic healing agent in an epoxy resin and the effect of mending temperature on the healing of resulting materials is investigated. Blends are prepared by adding 20 and 30 wt% COC powder in the epoxy resin. They are thermo‐mechanically characterized and fractured samples are thermally mended at various temperatures to evaluate the healing efficiency of the repaired samples. Optical microscopy reveals a homogenous dispersion of COC domains within epoxy matrix, while thermogravimetric analysis shows improved thermal stability of the samples. The immiscibility of the two phases in the blends lead to a decrease of the mechanical properties under flexural and tensile loading modes with respect to neat epoxy. The fracture toughness increases upon COC addition at elevated amounts. Healing efficiency values up to more than 80% are obtained at the lowest investigated temperature of 145°C for samples with 30 wt% of COC.

中文翻译：

---

环氧/环状烯烃共聚物共混物热修补工艺的优化

环烯烃共聚物（COC）在环氧树脂中用作热塑性愈合剂，并研究了修补温度对所得材料愈合的影响。共混物是通过在环氧树脂中添加20和30 wt％的COC粉末来制备的。它们具有热机械特性，并在各种温度下对断裂的样品进行热修复，以评估修复后的样品的愈合效率。光学显微镜显示环氧基质中COC域的均匀分散，而热重分析显示样品的热稳定性得到改善。共混物中两相的不混溶性导致相对于纯环氧，在弯曲和拉伸加载模式下机械性能下降。添加高含量的COC时，断裂韧性会提高。