偶联剂表面处理纳米SiO_2填充CE/BMI体系的力学性能  

Mechanical Properties of Nano-SiO_2 Treated by Coupling Agent Filled CE/BMI

作　　者：方芬[1] 颜红侠 李倩[1] 雷平森 

机构地区：[1]西北工业大学理学院应用化学系 [2]西仪集团有限责任公司,陕西西安710082

出　　处：《材料科学与工程学报》2007年第5期731-734,共4页Journal of Materials Science and Engineering

基　　金：陕西省自然科学基金资助项目(N5CS0003);西北工业大学研究生创业种子基金资助项目(Z200665)

摘　　要：本文研究了纳米二氧化硅(nano-SiO2)的含量对nano-SiO2/氰酸酯(CE)/双马来酰亚胺的预聚体(BMI)复合材料力学性能的影响;测量了用不同的硅烷偶联剂处理的nano-SiO2对水和甘油的相对接触角,利用Fowkes-Good几何方程计算了nano-SiO2的表面自由能,考察了经不同硅烷偶联剂处理的nano-SiO2对nano-SiO2/CE/BMI复合材料力学性能的影响。并通过扫描电镜分析nano-SiO2在基体中的分散性及增韧机理。结果表明,nano-SiO2对CE/BMI有增韧增强效果,当nano-SiO2含量为2.0wt%时复合材料的冲击、弯曲强度均最好;硅烷偶联剂处理可以增强纳米nano-SiO2的疏水性并降低其表面能,改善了其在基体中的分散性,有利于提高nano-SiO2/CE/BMI复合材料的冲击强度。The effect of the different content of nano-SiO_2 on the mechanical properties of the nano-SiO_2/ cyanate ester(CE)/ prepolymer of bismaleimide (BMI) composites was studied.The relative contact angles between the nano-SiO_2 treated by different silane coupling agents and water and glycerin were measured.The surface energies of the different nano-SiO_2 were calculated by Fowkes-Good equation.The effect of nano-SiO_2 treated by different silane coupling agent on the mechanical properties of the nano-SiO_2/CE/BMI composites was studied.The dispersion of the nano-SiO_2 in the CE/ BMI matrix and the toughening mechanism were analyzed by the scanning electron microscope.The results show that when the content of the nano-SiO_2 was 2.0wt%,the impact strength and flexural strength of the nano-SiO_2/CE/BMI composites reached the best.The hydrophobic property of nano-SiO_2 was increased and the surface free energy was decreased by treated with silane coupling agents.The impact strength of the nano-SiO_2/CE/BMI composites was increased due to the distributed improvement of nano-SiO_2 treated by the silane coupling agent.

关 键 词：纳米二氧化硅 偶联剂 表面自由能 氰酸酯 双马来酰亚胺 

分 类 号：TQ327[化学工程—合成树脂塑料工业]