聚甲基丙烯酸甲酯改性碳纳米管及其在聚合物中的应用

摘要

In this work,azodiisobutyronitrile was used to induce the polymerization of methl methacrylate on the surface of carbon nanotubes as a initiator,resulting CNTs grafted by polymethylmethacrylate(PMMA),improving the interfacial adhesion between CNTs and PVDF matrix,which was of benefit to the dispersion of CNTs in PVDF matrix.PVDF/CNTs and PVDF/CNTs-PMMA composites were fabricated by melt blending.As a result of the modification of CNTs,the dispersion of CNTs was better,the conduc-tive percolation threshold percolation threshold was reduced from 0.7 vol%for the PVDF/CNTs composites to 0.28 vol%for the PVDF/CNTs-PMMA composites,corresponding to 60%reduction in the amount of CNTs.It was proved that the chemical modifica-tion of fillers was an effective way to reduce the conductive percolation threshold.%本文利用引发剂偶氮二异丁腈(AIBN)在碳纳米管(CNTs)表面引发甲基丙烯酸甲酯(MMA)聚合,使CNTS表面接枝聚甲基丙烯酸甲酯(PMMA),提高CNTs与基体的界面粘结力,改善CNTs在基体中的分散状态.通过熔融共混法制备PVDF/CNTs和PVDF/CNTs-PMMA复合材料.结果表明改性后的CNTs在PVDF中的分散更好,PVDF/CNTs复合材料的导电逾渗阈值为0.7 vol%,PVDF/CNTs-PMMA复合材料的导电逾渗阈值为0.28 vol%,降低了60%.这表明通过对填料化学改性是一种降低复合材料逾渗阈值的有效方法.