采用具有不同链长的硅烷偶联剂 KH570 和 KH171 分别对纳米 TiO₂ 粒子进行了表面改性。 采用红外光谱( FT-IR) 、热重分析( TG) 、透射电镜( TEM) 和润湿性实验等测试。 结果表明:硅烷偶联剂有机链长的空间位阻效应对纳米粒子改性起关键作用。 TEM 表明经长链的 KH570 改性纳米 TiO₂ 分散效果更佳;热重分析和润湿性实验表明当长链 KH570 用量为 10% 时,纳米粒子表面接枝率和水接触角均达到最大,分别为 8. 05% 和 76. 6^o;红外光谱表明长链的 KH570 键合强度较 KH171 大。

Nano-TiO₂particles were modified respectively by silane coupling agent KH570 and KH171 with different chain length. The influence of KH570 and KH171 on the graft modifying effect of Nano-TiO₂was studied by FT-IR, TG, TEM techniques . The results show that the organic chain length of silane coupling agent can produce space steric hindrance effect . It plays a key role on modification nanometer particles. TEM show that dispersion effect on modifying nano-TiO₂by long-chain silane coupling agent( KH570 ) is much better. TG and wettability experiments show conent of long-chain silane coupling agent KH570 is 10 % , the coupling agent grafting rate and water contact angle is maximum, respectively 8 . 05 % and 76 . 6 ^o ; FT-IR show that long-chain KH570 bond strength is much stronger than KH171 .