【摘要】 碳纤维增强树脂复合材料具有诸多优异性能，但由于碳纤维与树脂基体（EP）间热膨胀系数不一致使得复合材料成型冷却后在界面处产生残余应力诱发应力集中导致复合材料界面性能下降。通过制备多醛化聚轮烷（PR）作为水性环氧的添加剂对碳纤维进行上浆，在界面相中构建了分子滑轮，得到了同时增强增韧界面的效果，并释放了界面残余应力。此外，还探讨了分子滑轮对复合材料界面增强增韧的机制。实验结果表明，相比于CF-desized/EP,CF-SD-PR/EP复合材料的横向纤维束测试强度、界面剪切强度和界面韧性分别得到了提升，界面残余应力从（1.60±0.04）GPa下降到（0.80±0.05）GPa。更多还原

【Abstract】 Carbon fiber reinforced resin matrix composites have many excellent properties. However,the inconsistent thermal expansion coefficients between carbon fibers and the epoxy resin(EP) matrix lead to residual stresses at the interphase,inducing stress concentration and resulting in a decrease in the mechanical performance of the carbon fiber reinforced polymers. Therefore,multi-aldehyde polyrotaxane(PR) was prepared as an additive of water-based epoxy to size carbon fiber,and molecular pulleys were constructed in its interphase,which simultaneously improved the interfacial strength and toughness and released the interfacial residual stress. Additionally,schematic models of interphase reinforcing mechanisms were proposed. The results indicate that the transverse fiber bundle’s tensile strength,interfacial shear strength,and interfacial toughness of CF-SD-PR/EP composite have increased compared to CF-desized/EP. The interfacial residual stress decreases from(1.60±0.04) GPa to(0.80±0.05) GPa.更多还原