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℃。
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 analy-sis (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.
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