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Imidazole and chromium acetylacetonate as additives for the cure and fracture toughness of epoxy resins and their composites
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机译：Imidazole and chromium acetylacetonate as additives for the cure and fracture toughness of epoxy resins and their composites
AbstractThe effects of additives such as 2‐undecyl‐imidazole (C11Z) and chromium acetylacetonate (Cr(acac)3) were examined on the curing behavior and fracture toughness of tetraglycidyldiaminodiphenyl methane/diaminodiphenyl sulphone (TGDDM/DDS) epoxy resins and their composites. The C11Z additive alone reacted with TGDDM epoxy resins at about 127°C and increased the resin viscosity, resulting in an acceptable resin content for composite processing. Further addition of Cr(acac)3to TGDDM/DDS/C11Z formulation increased the fracture toughness 5.7 times compared to the typical TGDDM/DDS/BF3MEA epoxy formulation used for the preparation of laminates. The interlaminar fracture toughness of the laminates prepared by TGDDM/DDS/C11Z/Cr(acac)3formulation was only twice as much as that prepared by typical TGDDM/DDS/BF3MEA. This was due to the fiber bridging contribution to the interlaminar fracture toughness. Based on the experiment, this fiber bridging contribution was only dependent on the fiber content. Thus, the interlaminar fracture toughness is approximated by the sum of the fracture toughness of epoxy matrix and the estimated fiber bridging contribu
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