尼龙12微球在苯并口恶嗪树脂中的增韧机理  

Toughening Mechanism of Nylon12 Microspheres in Polybenzoxazine Resin

作　　者：赵春霞[1] 周俊萍[1] 曾凯[1] 何达[1] 李姝靓 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500

出　　处：《高分子材料科学与工程》2017年第1期63-67,共5页Polymer Materials Science & Engineering

基　　金：西南石油大学过学术关项目(201131010068);西南石油大学大学生开放实验重点项目(KSZ15111);四川省教育厅重大培育项目(13CZ0027)

摘　　要：采用双酚A型苯并口恶嗪单体(Ba)和平均粒径为10μm的尼龙12(Nylon12)微球,制备了苯并口恶嗪树脂/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Tg。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. 10μm）. 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 nylonl2 can significantly enhance the toughness of PBa, while does not reduce Tg o~ 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.

关 键 词：尼龙12微球 苯并嗯嗪树脂 增韧机理 裂纹扩展 

分 类 号：TQ316.62[化学工程—高聚物工业]