中文摘要：

以聚丙烯（PP）为基料,将经过表面处理和未经过表面处理的不同质量分数纳米氧化镁（MgO）加入到PP中制得纳米MgO/PP复合材料,观察纳米粒子的分散特性,并对复合材料进行动态热机械分析（DMA）和热重分析（TGA）,观察纳米复合材料的动态机械特性和耐热性。结果表明：纳米MgO在PP中分散均匀,但加入3%未经表面处理的纳米MgO时,纳米复合材料中有轻微团聚现象。纳米MgO/PP复合材料的玻璃化转变温度约为2℃,纳米MgO的加入会提升粘流态转变温度,增大力学损耗因子,经过表面处理的MgO能整体上增加储能模量。低质量分数纳米MgO的加入不能提高PP的耐热性,当纳米MgO质量分数达到3%时,未经过表面处理和经过表面处理的纳米MgO/PP复合材料的初始热分解温度相比于PP分别提高了76℃和148℃。

英文摘要：

A nano-MgO/PP composite was prepared by adding different mass fraction of nano-MgO with surface treated and untreated into polypropylene （PP）. The dispersity of nanoparticles was observed, and the dynamic mechanical properties and heat resistance were studied by dynamic thermo-mechanical analysis （DMA） and thermo gravimetric analysis （TGA）. The results show that the nano-MgO is well dis- persed in the PP, and there is a little agglomeration in the composite with 3% of untreated nanoparticles. The glass transition temperature of the nano-MgO/PP is about 2℃, and the addition of nanoparticels can increase the viscous transition temperature and mechanical loss factor. The storage modulus of the compos- ites with surface-treated nanoparticles increases, but the heat resistance of the composites with low con- tent of nanoparticles can not be improved. When the mass fraction of nano-MgO increases to 3%, the ini- tial thermal decomposition temperature of the composites with surface-untreated and surface-treated nanoparticles increases by 76℃ and 148℃ respectively compared with PP.