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- 2018
Fe3O4-碳纳米管/聚偏氟乙烯复合材料的制备与性能
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Abstract:
通过在碳纳米管（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，采用动态力学分析（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：Fe3O4-CNTs的引入促使PVDF形成了β晶相，同时抑制了Fe3O4-CNTs/PVDF复合材料结晶度的下降；提高了弹性模量，抑制了阻尼特性下降；提高了介电常数和击穿场强，抑制了介电损耗升高。 Carbon nanotubes(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-CNTs were prepared by in situ hydrothermal synthesis method. Fe3O4-CNTs/PVDF composites 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 the adding of Fe3O4-CNTs, the crystallinity of the composite is improved and the PVDF β crystal phase is observed for adding Fe3O4-CNTs. The dielectric constant is increased, the increase of dielectric loss is inhibited. The breakdown field strength is increased visibly. 国家自然科学基金（51305437）；高等学校博士学科点专项科研基金（20136118120003）
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