Tailoring the polarity of polymer shell on BaTiO_(3) nanoparticle surface for improved energy storage performance of dielectric polymer nanocomposites  

作　　者：Hongfei Li Liwei Wang Yingke Zhu Pingkai Jiang Xingyi Huang 

机构地区：[1]Shanghai Key Laboratory of Electrical Insulation and Thermal Aging,The State Key Laboratory of Metal Matrix Composites,Department of Polymer Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Chemical Letters》2021年第7期2229-2232,共4页中国化学快报（英文版）

基　　金：The financial support from National Natural Science Foundation of China(No.51877132)。

摘　　要：Nanocomposites comprising flexible polymers and high dielectric constant inorganic nanoparticles are considered to be one of the promising candidates for electrostatic capacitor dielectrics.However,the effect of interfacial property on electrical ene rgy storage of dielectric polymer nanocomposites is still not clear.Herein,the role of the polarity of the interfacial region is investigated.For this purpose,three polymers with different polarity,polymethyl methacrylate(PMMA),polyglycidyl methacrylate,and polymethylsulfonyl ethyl methacrylate(PMSEMA)are attached onto BaTi0_(3)(BT)na noparticle surface via surface-initiated reversible addition-fragmentation chain transfer polymerization.It is found that the polarity of shell polymers shows an apparent effect on the dielectric and energy storage of dielectric polymer nanocomposites.For example,PMSEMA@BT(shell polymer possesses the highest polarity)increases dielectric loss and decreases the breakdown strength of the nanocomposites,leading to lower ene rgy storage capability.However,PMMA@BT(shell polymer possesses the lowest polarity)can induce higher breakdown strength of the nanocomposites.As a result,the PMMA@BT nanocomposite exhibits the highest electrical energy sto rage capability among the three nanocomposites.This re search provides new insight into the design of core-shell nanofillers for dielectric energy storage applications.

关 键 词：CORE-SHELL Dielectric constant Polarity Space charge Energy density 

分 类 号：TB332[一般工业技术—材料科学与工程] TM53[电气工程—电器]