碳纳米管/聚甲醛复合材料的结晶形态与力学性能

Crystallite Morphology and Mechanical Properties of Carbon Nanotube/POM Nanocomposites

在对碳纳米管(CNT)进行表面修饰后,采用活性自由基聚合法(ATRP)在其表面接枝聚甲基丙烯酸甲酯(PMMA)。再将接枝上聚合物的碳纳米管添加到聚甲醛中熔融共混制得碳纳米管/聚甲醛纳米复合材料。通过偏光显微镜观察其结晶形态,并研究了功能化碳纳米管的含量对聚甲醛缺口冲击强度的影响,结果表明,CNT-PMMA的加入使聚甲醛球晶细化,复合材料的缺口冲击强度得到提高。

Polymethyl methacrylate（PMMAs） was successfully grafted onto the surface of carbon nanotubes（CNT） by atom transfer radical polymerization（ATRP） following the surface modification of CNT.CNT/POM nanocomposites were prepared by adding CNTPMMA into polyformaldehyde（POM） matrices and using melt processing.Polarized optical microscope was used to observe crystallite morphology of nanocomposites,and study on the impact strength of nanocomposites with different contents CNT-PMMA.The results show that the spherulites become fine and the izod impact strength of nanocomposites increases greatly with addition of CNT-PMMA.