半胱氨酸改性纳米Ag/PVDF复合材料制备及介电性能研究  

Preparation and dielectric properties of cysteine modified nano Ag/PVDF composite

作　　者：胡立 姚军龙[1] 游峰[1] 江学良[1] 李振强[1] 严立明 祁耀斌[3] HU Li1 ,YAO Junlong1,YOU Feng1,JIANG Xueliang1, LI Zhenqiang1, YAN Liming2 , QI Yaobin2(1. School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205 ,China; 2. Hubei Hongzhao Building Materials Co., Ltd., Macheng 438300, China; 3. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070,Chin)

机构地区：[1]武汉工程大学材料科学与工程学院,武汉430073 [2]湖北宏钊建材有限责任公司,麻城438300 [3]武汉理工大学光纤传感技术国家工程实验室,武汉430070

出　　处：《功能材料》2018年第5期5151-5155,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51273154);湖北省自然科学基金资助项目(2017CFB289)

摘　　要：以半胱氨酸为改性剂,对纳米Ag进行表面修饰,制备了系列改性纳米Ag/PVDF复合材料;通过对复合材料的介电性能进行研究,结果表明,改性后纳米Ag在PVDF基体中的填充量能够得到迅速提高,体积分数可达到25%以上而不发生导电现象;当改性纳米Ag/PVDF复合材料中纳米Ag体积含量达到20%时,复合材料的相对介电常数达到了115,介电损耗保持在0.09以下;通过扫描电子显微镜、傅立叶红外光谱和X射线衍射图谱分析表明,这种高介电常数,低介电损耗的性质来源于纳米Ag在聚合物基体中分散性的提高,改性纳米Ag表面连接的半胱氨酸改善了纳米Ag粒子与PVDF基体的界面相容性,提高了PVDF结晶体和纳米Ag在基体中的分散均一性,降低了聚合物基体内纳米Ag团聚和导电网络的形成几率,有效改善了金属/聚合物介电材料的加工条件,提高了聚合物的介电性能。A series of modified nano-Ag/PVDF composites were prepared by modifying the surface of nano-Ag with cysteine as modifiers.The dielectric properties of the composites were studied.The results show that the loading of modified nano-silver in PVDF matrix can be rapidly increased,and the volume fraction can reach more than 25% without conducting phenomenon.The modified Ag/PVDF composite has a high dielectric constant above 115 and a low dielectric loss below 0.09 when the content of modified Ag in the composite reaches20 vol%.The results of scanning electron microscopy（SEM）,Fourier transform infrared spectroscopy（FT-IR）and X-ray diffraction（XRD）show that the better dielectric properties of the modified-Ag/PVDF composites are due to the good dispersivity of the modified nano-Ag in the polymer matrix.The cysteine connected in the surface of Ag ameliorates the interface compatibility of Ag and PVDF,improving the dispersion uniformity of nano-Ag in the PVDF matrix,and reducing the probability of the agglomeration of nano-Ag and the formation of conductive paths in the polymer matrix.The processing conditions of metal/polymer dielectric materials have been effectively improved,which improves the dielectric properties of polymers.

关 键 词：半胱氨酸 改性纳米Ag PVDF 介电常数 介电损耗 

分 类 号：TB332[一般工业技术—材料科学与工程]