超支化聚(胺-酯)接枝改性纳米TiO_2的研究

Study on Surface Modification of Nano-TiO_2 Grafted with Hyperbranched Poly(amine-ester)

提出了一种对纳米TiO2表面进行化学改性的新方法,即利用硅烷偶联剂KH550进行表面预处理,得到接枝有KH550的纳米TiO2,在此基础上以改性纳米TiO2为中心核,通过与AB2型单体进行缩聚反应,在纳米TiO2的表面原位接枝超支化聚(胺-酯)(HBP)。红外光谱、热失重和透射电镜的测试结果表明纳米TiO2表面接枝上了超支化聚合物,接枝率约为15%。研究结果表明,纳米TiO2经超支化聚(胺-酯)接枝改性后,在乙醇和氯仿中的分散性和稳定性得到提高。

A new method to chemical modified the surface of nano-TiO2 was studied.Coupling agent KH550 was grafted onto the surface of nano-TiO2.TiO2-g-poly（amine-ester） nanocomposites were synthesized through one-spot polycondensation between AB2 monomer and TiO2-g-KH550.The results of FTIR,TG and TEM showed that the hyperbranched poly（amine-ester）（HBP） was grafted onto the surface of nano-TiO2 and the weight ratio of the hyperbranched polymer grafted on the surface reached 15%.Results indicated that nano-TiO2 grafted with hyperbranched poly（amine-ester） had better dispersion in the ethanol and chloroform than that of unmodified nano-TiO2.