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选用乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)三元共聚物对纳米SiO2表面进行修饰包覆改性,考察改性后纳米SiO2在聚对苯二甲酸丁二醇酯(PBT)基体中的分散情况及对PBT复合材料力学性能的影响。FTIR、TEM、SEM结果表明,E-MA-GMA的环氧基团与纳米SiO2的—OH基团发生反应,破坏了SiO2的链状团聚结构,降低了纳米粒子间氢键等作用力。质量分数为10%~20%E-MA-GMA改性的纳米SiO2在PBT基体中的分散性及其与基体的相容性均得到明显改善,从而提高了PBT基复合材料的弯曲和拉伸性能。与纯PBT相比,SiO2/PBT复合材料的拉伸强度提高了9%,而弯曲强度和模量分别提高了14%和20%。
The surface of nano-SiO2 was modified and coated with ethylene-acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer. The effects of modified nano-SiO2 on the surface of polybutylene terephthalate (PBT) matrix dispersion and the mechanical properties of PBT composites. The results of FTIR, TEM and SEM showed that the epoxy group of E-MA-GMA reacted with the -OH group of nano-SiO2, which destroyed the chain-like aggregation structure of SiO2 and reduced the hydrogen bonding force between nano-particles. The dispersibility of E-MA-GMA modified nano-SiO2 in the matrix of PBT and its compatibility with the matrix were all improved obviously with the mass fraction of 10% ~ 20%, which improved the bending and drawing of the PBT matrix composites performance. Compared with pure PBT, tensile strength of SiO2 / PBT composites increased by 9%, while flexural strength and modulus increased by 14% and 20% respectively.