ATRP法在纳米TiO_2表面接枝PS及其对SBS的改性

通过溶胶-凝胶法制备金红石型纳米二氧化钛(TiO_2),再利用原子转移自由基聚合(ATRP)法在纳米TiO_2表面接枝聚苯乙烯(PS),并以此对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)进行改性。红外光谱、X射线光电子能谱及透射电镜测试结果表明,PS大分子链成功地接枝到纳米TiO_2粒子表面。力学性能、动态力学分析及热重分析测试结果显示,SBS/TiO_2-g-PS复合材料的力学性能与热稳定性均明显优于纯SBS及SBS/TiO_2复合材料。经紫外光老化后,SBS/TiO_2-g-PS复合材料的力学性能保持率最高。

Grafting PS onto Surfaces of Nano Titanium Dioxide via ATRP Reaction & Modification of SBS

The nano rutile titanium dioxide (TiO2) was prepared through sol-gel method and poly (styrene) (PS) was grafted onto the surfaces of the prepared nano TiO2 via atom transfer radical polymerization (ATRP) method.Then,modification of styrene-butadiene-styrene block eopolymer (SBS) with the resulted nano TiO2-g-PS composite particles was studied.The results of Fourier transform infrared spectroscopy (FT-IR),X-ray photoelectron spectroscopy (XPS) and transmission electron microscope (TEM) show that the PS macromolecular chains are successfully grafted onto the surfaces of nano TiO2.Through the measuremems of mechanical properties,dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA),the mechanical property and thermal stability of SBS/TiO2-g-PS composites are better than those of pure SBS and SBS/TiO2 composites.After UV aging test,the mechanical property retention rate of SBS/TiO2-g-PS composites is superior to that of pure SBS and SBS/TiO2 composites.