ATRP法在纳米SiO_2表面接枝PBA及其对PVC的改性

Grafting PBA onto Surfaces of Nano-Silica via ATRP Reaction & Modification of PVC

采用原子转移自由基聚合法(ATRP)在纳米二氧化硅(SiO2)粒子表面接枝聚丙烯酸丁酯(PBA),并以此对聚氯乙烯(PVC)进行改性。红外光谱(FT-IR)、透射电镜(TEM)、扫描电镜(SEM)及力学性能等测试结果表明,所制备的SiO2-g-PBA纳米复合粒子在PVC中分散均匀,使PVC/SiO2-g-PBA复合材料的缺口冲击强度及拉伸强度均明显高于PVC及PVC/SiO2复合材料。当SiO2-g-PBA纳米复合粒子的质量分数为5%时,PVC/SiO2-g-PBA复合材料的冲击强度达到9.5kJ/m2,较纯PVC提高了280%,同时拉伸强度也有一定的提高,达到了65.3MPa。

Poly （butyl acrylate） （PBA） was grafted onto the surfaces of nano-silica （SiO2） via surface-initiated atom transfer radical polymerization （ATRP）,and the modification of poly （vinyl chloride） （PVC） with nano SiO2-g-PBA composited particles was studied.The results of Fourier transform infrared spectra （FT-IR）,transmission electron microscope （TEM）,scanning electron microscope （SEM） and mechanical property measurements show that nano SiO2-g-PBA composited particles are more easily dispersed in the matrix than bare nano-SiO2.Consequently,the impact strength and tensile strength of PVC/SiO2-g-PBA composites are superior to those of PVC and PVC/SiO2 composites,while the mass content of SiO2-g-PBA nano composited particles is 5%,the impact strength of PVC/SiO2-g-PBA composites amounts to 9.5 kJ/m^2,which is 2.8 times more than that of pure PVC.Meantime,the tensile strength can also reach 65.3 MPa.