采用表面接枝十六烷烃的方法对多壁碳纳米管（MWCNTs）进行改性,通过溶液共混法制备多壁碳纳米管/聚丙烯（MWCNTs/PP）复合材料,并研究了MWCNTs/PP的结晶行为。结果表明,3%（质量分数）表面接枝十六烷烃的MWCNTs在PP基体中分散良好,达到纳米级的分散。加入接枝MWCNTs后,PP的结晶结构未发生改变,依然是α晶型。接枝MWCNTs对PP有异相成核的作用,加入接枝MWCNTs使PP的成核及晶体生长方式发生变化。加入3%（质量分数）接枝MWCNTs以后,PP的结晶温度升高了8℃,结晶速率提高了1倍,结晶度提高了3%,球晶尺寸减小。
Multi-walled carbon nanotubes（MWCNTs） were modified through grafting C16 alkyl chains.MWCNTs/polypropylene（PP） composites were prepared through solution blending.The crystallization behaviors of MWCNTs/PP composites were studied.The experimental results show that 3%（mass fraction） grafted MWCNTs with C16 alkyl chains could be dispersed very well in PP matrix.The grafted MWCNTs could be dispersed on nano-scale.The presence of the grafted MWCNTs does not change the α-crystal form of PP.The introduction of the grafted MWCNTS induces the heterogeneous nucleation of PP in the grafted MWCNTs/PP composites,which will affect the mechanism of nucleation and the crystal growth of PP.After the addition of 3%（mass fraction） grafted MWCNTs in the PP matrix,the crystallizing temperature is increased by 8 ℃,the crystallizing rate is improved one time,and the crystallinity of PP matrix is increased by 3%.Moreover,the spherulity size decreases.
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