采用双酚A型苯并嗪单体(Ba)和平均粒径为10 μm的尼龙12 (Nylon12)微球,制备了苯并嗪树脂/尼龙12(PBa/Nylon12)复合材料.通过差示扫描量热仪分析了Nylon12对Ba固化行为的影响;采用动态力学分析仪对纯PBa和PBa/Nylon12复合材料储能模量和玻璃化转变温度(Tg)进行了测试;在万能材料实验机上,对试样进行了单缺口三点弯曲(SEN-3PB)和双缺口四点弯曲(DN-4PB)测试.结果表明,Nylon12可以有效提高PBa的韧性,但不降低PBa的t.通过光学显微镜、激光扫描共焦电镜和扫描电镜分析了试样断面微观形貌及裂纹扩展状态.力学性能测试结果和裂纹扩展过程分析结果表明,Nylon12微球在PBa基体中的增韧机理为裂纹偏转和裂纹锚钉协同效应.
Polybenzoxazine/nylon12 (PBa/Nylon12) composites were prepared based on bisphenol-A type benzoxazine (Ba) and nylon12 microspheres (ave.10 μm).Differential scanning calorimetry (DSC) was employed to detect the effect of nylon12 on curing behaviors of Ba.The storage modulus and glass transition temperature (Tg) of the pristine PBa and PBa/nylon12 composite were measured through dynamic thermomechanical analysis apparatus (DMA).The single-edge-notch three-point-bending (SEN-3PB) and double-notch four-point-bending (DN-4PB)test were carried out on a universal material testing machine.The results demonstrate that nylon12 can significantly enhance the toughness of PBa,while does not reduce Tg of PBa.The crack propogation state and the morphologies of fracture surfaces were measured by optical microscopy (OM),laser scanning confocal microscope (LSM) and scanning electron microscopy (SEM).The combination analysis of mechanical properties and crack propogation process confirm that nylon12 possesses a synergistic toughening mechanism of crack ground-anchor and crack deflection in PBa matrix.
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