Some composites of alkali treated jute fibers and vinylester-isocyanate/urethane hybrid resin were fabricated. The mechanical, thermo-mechanical, fractographic and aging behavior of these composites were studied and compared with the parent vinylester resin (VER) matrix composites. Using hybrid resin matrix, the impact strength of jute composites was increased by ∼20% over the VER matrix composites. It was, however, accompanied by the marginal improvement in their tensile and flexural properties. Dynamic mechanical analysis showed increased storage modulus and broadened tan δ peak when VER-isocyanate hybrid resin was used as a matrix material compared with the parent VER matrix in jute composites showing its superior stiffness and flexibility. In humid environment, a decrease in the weight gain and swelling thickness was observed for VER-isocyanate hybrid matrix jute composites after 60 days exposure when compared with the parent VER matrix composites. Under accelerated water aging, the drop of 12–24% in the tensile strength was noticed for VER-isocyanate hybrid matrix jute composites as compared to ∼29% for VER matrix composites. The changes in the mechanical response of all composites can be well co-related with their fractographic evidences existed onto the tensile fracture surfaces in both dry and wet conditions.

制备了一些碱处理过的黄麻纤维和乙烯基酯-异氰酸酯/聚氨酯杂化树脂的复合材料。研究了这些复合材料的机械、热机械、断口和老化行为，并与母体乙烯基酯树脂 (VER) 基复合材料进行了比较。使用混合树脂基体，黄麻复合材料的冲击强度比 VER 基复合材料提高了约 20%。然而，伴随着它们的拉伸和弯曲性能的边际改善。动态力学分析表明，与黄麻复合材料中的母体 VER 基体相比，当使用 VER-异氰酸酯杂化树脂作为基体材料时，储能模量增加，tanδ 峰变宽，显示出其优异的刚度和柔韧性。在潮湿的环境中，与母体 VER 基复合材料相比，在暴露 60 天后，观察到 VER-异氰酸酯杂化基黄麻复合材料的重量增加和膨胀厚度减少。在加速水老化下，VER-异氰酸酯杂化基黄麻复合材料的拉伸强度下降了 12-24%，而 VER 基复合材料的拉伸强度下降了 29%。所有复合材料机械响应的变化都与它们在干燥和潮湿条件下拉伸断裂表面上存在的断口证据密切相关。