ATRP法在纳米SiO2表面接枝PBA及其对POM的改性

本论文研究了原子转移自由基聚合法(ATRP)在纳米二氧化硅(SiO2)表面接枝聚丙烯酸丁酯(PBA)以及其对聚甲醛（POM）进行改性。红外光谱（FTIR）、透射电镜(TEM)及凝胶渗透色谱（GPC）等测试表明：采用ATRP法可制备均匀分散的SiO2-g-PBA纳米复合粒子。力学性能、扫描电子显微镜（SEM）及透射电子显微镜（TEM）等测试表明：纳米SiO2在POM中团聚明显，而SiO2-g-PBA纳米复合粒子POM中分散均匀，导致POM/SiO2-g-PBA纳米复合材料的缺口冲击强度明显高于POM及POM/SiO复合材料，当SiO2-g-PBA纳米复合粒子的质量分数为2%时，POM/SiO2-g-PBA复合材料的冲击强度是POM的8倍多，同时拉伸强度有一定的增加。

Studies on grafting PBA onto surface of nano- silicon dioxide via ATRP reaction & modification of POM

In this paper, poly(butyl acrylate) (PBA) was grafted onto the suface of nano silicon dioxide particles through surface-initiated atom transfer radical polymerization (ATRP). The results of FT-IR spetra, transmission electron microscope (TEM) and gel permeation chromatography (GPC) measurements show that we can prepare well dispersed nano SiO2-g-PBA composited particles by means of ATRP method. Moreover, the effects of nano silicon dioxide (SiO2) particles and nano SiO2-g-PBA composited particles on the of polyoxymethylene (POM) were studied by means of mechanical properties test, scanning electron microscope (SEM) and TEM. The results show that nano SiO2 particles conglomerate in POM matrix, while nano SiO2-g-PBA composited particles can be well dispersed in POM, leading to better notched impact strength of POM/ SiO2-g-PBA composite than that of neat POM or POM/ SiO2 composite. When the content of nano SiO2-g-PBA composited particles is 2%, the impact strength of composited material is 8 times than that of pure POM, and tensile strength is also imoproved .