《复合材料学报》优先在线发表论文。

摘要：通过在CNTs表面进行功能化修饰，改善CNTs与聚偏氟乙烯（Polyvinylidene Fluoride，PVDF）的分散性及界面结合程度，从而获得优异的力学性能和电学性能，提高其在传感器、致动器和储能方面的应用性能。采用原位水热合成法，在CNTs表面修饰磁性Fe₃O₄纳米粒子，然后将Fe₃O₄-CNTs加入PVDF中，采用流延工艺制备出Fe₃O₄-CNTs/PVDF复合薄膜。采用SEM、TEM、XRD和DSC研究了Fe₃O₄-CNTs/PVDF复合薄膜的结构和结晶行为，采用DMA、宽带介电谱测试系统和交流击穿场强测试系统研究了Fe₃O₄-CNTs对复合材料力学性能、介电性能及击穿场强的影响。结果表明，由于Fe₃O₄-CNTs的引入，PVDF形成了β晶相，同时抑制了Fe₃O₄-CNTs/PVDF复合材料的结晶度的下降；提高了弹性模量，抑制了阻尼特性下降；提高了介电常数，击穿场强，抑制了介电损耗升高。

关键词：聚偏氟乙烯；Fe₃O₄-CNTs；晶体结构；介电性能；击穿场强

Abstract: CNTs were modified by Fe₃O₄, the dispersibility of CNTs in polyvinylidene fluoride (PVDF) and interfacial adhesion were improved so as to achieve high mechanical properties and electrical properties, better application for sensor, actuator and energy storage with functional performance. Fe₃O₄ modified CNTs were prepared by in situ hydrothermal synthesis method, andFe₃O₄-CNTs/PVDF composite were prepared by the casting process. The structure and crystallization behavior of Fe₃O₄-CNTs/PVDF composite films were studied by SEM, TEM, XRD and DSC. The mechanical properties, the dielectric properties and breakdown field strength of Fe₃O₄-CNTs/PVDF composite were studied by DMA and the broadband dielectric spectrometer. The results show that, due to adding Fe₃O₄-CNTs, the PVDF β crystal phase is observed, the decrease of crystallinity of the Fe₃O₄-CNTs/PVDF composite is inhibited. The storage modulus is increased, the decrease of damping property is inhibited. The dielectric constant is increased, the increase of dielectric loss is inhibited. The breakdown field strength is increased visibly.

Keywords:polyvinylidene fluoride; Fe₃O₄-CNTs; crystal structure; dielectric properties;breakdown field strength

作者：安宁丽等，西安理工大学印刷包装与数字媒体学院，西安

通讯作者：安宁丽，西安理工大学印刷包装与数字媒体学院，西安

全文详见中国知网学术期刊优先数字出版。