钛酸锶纳米纤维表面羟基化处理对聚偏氟乙烯复合材料介电性能和储能性能的影响  

Effects of suface hydroxylated strontium titanate nanofibers on dielectric and energy storage properties of polyvinylidene fluoride composites

作　　者：王娇 刘少辉 周梦 郝好山 翟继卫[2] Wang Jiao;Liu Shao-Hui;Zhou Meng;Hao Hao-Shan;Zhai Ji-Wei(School of Science,Henan Institute of Engineering,Zhengzhou 451191,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]河南工程学院理学院,郑州451191 [2]同济大学材料科学与工程学院,上海201804

出　　处：《物理学报》2020年第21期332-340,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51902088);河南省科技攻关计划(批准号:202102210002,202102210041);河南省大学生创新创业训练计划(批准号:S201911517008)资助的课题.

摘　　要：随着功率型电力电子设备运行负荷的不断增加以及小型化集成化的发展趋势,对电介质电容器提出了更高的要求,其需具有高储能密度、快速充放电速度、易加工成型.钛酸钡基无铅铁电陶瓷具有较高的介电常数的优点,但耐击穿场强低,而聚偏氟乙烯(PVDF)聚合物材料具有良好的柔韧性、击穿场强高、质量轻的优点,但介电常数相对较低,两者的储能密度均受到了限制.为了获得高介电常数、高储能密度介质材料,采用静电纺丝法制备了钛酸锶(SrTiO3)一维纳米纤维作为无机填料,以聚偏氟乙烯(PVDF)为聚合物基体,为了改善SrTiO3一维纳米纤维与PVDF聚合物基体之间的界面情况,利用表面羟基化处理方法对SrTiO3一维纳米纤维进行表面改性,辅以流延法制备了SrTiO3/PVDF复合材料,研究了表面羟基化处理SrTiO3一维纳米纤维对复合材料储能性能的影响.结果表明:表面羟基化处理SrTiO3纳米纤维填料在PVDF聚合物中分散和结合情况良好,复合材料具有良好的介电性能和耐击穿性能;当表面羟基化处理SrTiO3一维纤维填料的填充量为2.5%(体积分数)时,复合材料的储能密度达7.96 J/cm^3.With the rapid development of the electronics industry,the dielectric materials with high energy storage density,fast charge and discharge speed,easy-to-process and easy-to-mold,and stable performance are urgently needed to meet the requirements for lightweight and miniaturization of electronic component equipment.Dielectric ceramics has a high dielectric constant,but low breakdown field strength.Polyvinylidene fluoride(PVDF)has the advantages of good flexibility,high breakdown field strength,and light weight,but its dielectric constant is low.Achieving the ability to tailor the interface between dielectric ceramics filler and PVDF polymer matrix is a key issue for realizing the desirable dielectric properties and high energy density in the nanocomposites.As a result,much effort has been made to prepare the polymer composites through the surface modification of the nanoparticles with high dielectric constant fillers dispersed in a matrix,with the hope of preparing composites containing the high dielectric constant of the ceramic fillers and the high breakdown strength of polymers.In this work,in order to obtain the high dielectric-constant and high-energystorage-density dielectric ceramics,the electrospinning method is used to prepare the SrTiO3 one-dimensional nanofibers as the inorganic fillers and the casting method is adopted to prepare PVDF as the polymer matrix.To improve the interface between inorganic nanofiber fillers and PVDF matrix,the SrTiO3 nanofibers are modified by surface hydroxylation.The effects of suface hydroxylated SrTiO3 nanofibers on the dielectric properties and energy storage properties of PVDF composites are studied.The correlation between interface modification and energy storage performance of composites is investigated to reveal the mechanism of enhanced energy storage performance of SrTiO3 nanofibers/PVDF composites.The results show that the dispersion of surface-hydroxylating SrTiO3 nanofibers in PVDF polymer can be improved.The composites exhibit improved dielectric properties and

关 键 词：钛酸锶 储能性能 纳米纤维 表面改性 

分 类 号：TB33[一般工业技术—材料科学与工程] TM53[电气工程—电器]