2128 異なるモノマーを混合したビスフェノールA型エポキシ樹脂の破壊特性 : 材料特性評価による考察(S12-1 機能材料,S12 先端材料システムの強度・機能評価とメゾメカニックス)

概要

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In the present study, we investigated the effect of adding a high molecular weight monomer to one with low molecular weight on the fracture toughness of epoxy resin in terms of cross-link density and heterogeneity. To characterize the cross-link density and heterogeneity, we evaluated the glass transition temperature, T_g, and fragility, m, from thermo-viscoelastic properties. To confirm the microstructure heterogeneity in the epoxy resins, we analyzed roughness of fracture surfaces with atomic force microscope. Over the range from 0 to 30wt% high molecular weight monomer used in the present work, we found that it induced lower cross-link density (lower T_g) and made epoxy resin more heterogeneous (lower m), and this resulted in higher K_<IC>. This study revealed that both T_g and m are effective for characterizing material in relation to the fracture toughness of the blended epoxy resins.
2007-09-07