Study On Composites Of Polymers And Surface-modified TiO₂ Particles

In this article, the surface of anatase TiO2 was modified by irradiation induced graft polymerization, carboxylic acids and coupling agent K11570. The properties of surface modified TiO2 were investigated by some methods. Modified-TiO2 particles were incorporated into polymers via melt compounding. Dispersion of modified TiO2 particles in polymers and thermal stability and UV resistance of the composites were investigated.The experiment results showed that:1. The surface of anatase TiO2 was successfully grafted with maleic andydride (MAH), butyl acrylate(BA) and styrene(St) using y radiation. The testing results showed that: (1)irradiation dose:80KGy, St concentration:10%, graft yield was 5.42%.(2) discussed mechanism of graft polymerization, grafting yield of TiO2 with St was the higher than MAH and BA.(3) the results showed the grafted TiO2 had better compatibility with the polymers matrix. thermal stability and UV resistance of PP/MPP/g-TiO2 and ABS/g-TiO2 composites were higher than PP/TiO2 and ABS/g-TiO2, respectively.2. Surface modification of TiO2 with MAH and Lactic acid (LA) were under certain conditions. The results show that:(1) when TiO2/MAH ratio=1/2, temperature:180℃, time:24h, graft yield was 5.2%. when TiO2/LA ratio=1/2, temperature:180℃, time:48h, graft yield was10.3%.(2) discussed the mechanism of TiO2 modified with carboxylic acids, grafting yield of TiO2 with LA was the higher than MAH.(3) surface of modified TiO2 with different functional groups led to difference in organic solvents.3. TiO2 was pretreated with coupling agent KH570, TiO2-g-PS particles were prepared by y-ray radiation. The results show that:(1) graft yield of TiO2 with KH570 about 2%, when the radiation dose:80KGy, St concentration:10%, graft yield was10.6%.(2) the results showed the grafted TiO2 had better compatibility with the ABS. thermal stability and UV resistance of ABS/TiO2-g-PS composites were higher than ABS/TiO2.