用溶胶-凝胶法制备纳米二氧化钛(TiO2),并用硅烷偶联剂y-甲基丙烯酰氧基丙基三甲氧基硅烷(CG570)和油酸(OA)对其进行表面改性,提高了其亲油性;将改性TiO2对聚丙烯(PP)进行共混改性制备得到PP复合材料.分别研究改性剂类型和CG57O-TiO2用量对PP复合材料力学性能、耐热性能和结晶性能的影响.研究表明,CG570-TiO2对PP共混改性效果相对较好;当CG570-TiO2的用量为3%时,PP复合材料的综合性能最佳;相比于纯PP,其热分解温度、结晶温度和力学性能均有所提高,其中冲击强度提高了35%.
Nano-titanium dioxide (TiO2) was prepared by sol-gel method and it was modified by γ-methacryloxypropyltrimethoxysilane (CG570) and oleic acid (OA) respectively.The modified TiO2 with good lipophilicity was used for blending modification of polypropylene (PP),and the PP composites were prepared.The effects of modifier type and the amount of CG570-TiO2 on the mechanical properties,heat resistance and crystallization properties of PP composites were investigated respectively.The results shows that CG570-TiO2 has a relative good modification effect on PP blending;when the amount of CG570-TiO2 is 3%,the comprehensive performance of PP composite material is the best.Compared with pure PP,the thermal decomposition temperature,crystallization temperature and mechanical properties of the PP composites are improved;particularly,the impact strength is increased by 35%.