改性环氧树脂接枝纳米二氧化硅的机理

为了改善纳米二氧化硅易聚集成团且与有机基体之间结合力差的缺陷,结合环氧树脂具有较多活性基团、良好的油溶性等特点,将环氧树脂扩链并接枝到纳米二氧化硅的表面.通过调节反应温度、改变对-氨基苯甲酸和环氧树脂的配比优化出最佳改性方案,利用沉降实验、吸水实验和红外光谱分析来衡量改性效果,并对改性前后纳米二氧化硅的表面极性、分散能力等性能进行分析,得出对-氨基苯甲酸和环氧树脂E-44的摩尔比为1∶1、改性温度为100℃时改性效果最好.最后,建立微观模型,分析改性机理.

Modification Mechanism of Nano-silicon Dioxode Grafted by the Modified Epoxy Resin

Toimprove the easily aggregated characteristics of nano-silicon dioxide, the poor bonding force between nano-silicon dioxide and the organic substrate, the epoxy resin was grafted onto the surface of nano-silicon dioxide, which was treated by the prior chain-extending reaction, taking full use of the advantages of epoxy resin such as many active groups and better hydrophobic. The best formula was obtained by the adjustment of the reactive temperature and the ratio of between epoxy resin and para-amino benzoic acid. Sedimentation experiments, water absorption measurements and infrared absorption ( IR ) were used to verify the modification effects, and the surface state, dispersion ability of the unmodified and modified nano-silicon dioxide were also analyzed. Results show that the best modification parameters are the molar ratio is 1;1 between epoxy resin E-44 and para-amino benzoic acid, and the perfect reactive temperature is 100 ℃. Finally, the microscopic model was created to clarify the modification mechanism.