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为了提高纳米SiO2粒子与环氧树脂基体的界面作用力,促进其在基体中的分散,选择苯乙烯和马来酸酐作为单体对纳米SiO2粒子进行化学接枝改性。用红外光谱和核磁共振法对接枝的纳米粒子进行表征,用透射电镜和动态光散射对粒子分散性进行研究,结果表明,接枝链通过化学键接在纳米粒子表面,使得粒子分散性能得到提高。对影响接枝效果的引发剂浓度、单体浓度、反应时间、引发剂引发时间等因素进行了优化,得到了纳米粒子接枝的最佳反应条件。
In order to improve the interfacial force between the nano-SiO2 particles and the epoxy resin matrix and promote the dispersion in the matrix, styrene and maleic anhydride were chosen as the monomers to modify the nano-SiO2 particles chemically. The grafted nanoparticles were characterized by FTIR and NMR. The dispersibility of the particles was studied by transmission electron microscopy and dynamic light scattering. The results showed that the dispersion of the grafted chains on the surface of the nanoparticles was improved by chemical bonding . The factors such as concentration of initiator, monomer concentration, reaction time and initiator initiation time were optimized, and the optimal reaction conditions for grafting nanoparticles were obtained.