Co-modulated interface binding energy and electric field distribution of layer-structured PVDF–LDPE dielectric composites with BaTiO3: experiment and multiscale simulations  

作　　者：Ruitian Bo Chunfeng Wang Yongliang Wang Peigang He Zhidong Han 

机构地区：[1]School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [3]Key Laboratory of Engineering Dielectrics and Its Application(Ministry of Education),Harbin University of Science and Technology,Harbin 150080,China

出　　处：《Frontiers of Materials Science》2023年第3期155-167,共13页材料学前沿（英文版）

基　　金：supports from the Key projects of Natural Science Foundation of Heilongjiang Province(ZD2020E007).

摘　　要：The layer-structured composites were built by the dielectric and insulating layers composed of polyvinylidene fluoride(PVDF)and low-density polyethylene(LDPE)composites containing barium titanate(BT)to modulate the dielectric and energy storage properties of the composites.The simulations on the interface models for molecular dynamics and the geometric models for finite element analysis were performed together with the experimental characterization of the morphology,dielectric,and energy storage properties of the composites.The results revealed that polyethylene as an insulating layer played a successful role in modulating dielectric permittivity and breakdown strength while BT particles exerted positive effects in improving the miscibility between the composed layers and redistributing the electric field.The strong interface binding energy and the similar dielectric permittivity between the PVDF layer and the BT20/LDPE layer made for the layer-structured composites with a characteristic breakdown strength(Eb)of 188.9 kV·mm^(−1),a discharge energy density(Ud)of 1.42 J·cm^(−3),and a dielectric loss factor(tanδ)of 0.017,which were increased by 94%,141%,and decreased by 54%in comparison with those of the BT20/PVDF composite,respectively.

关 键 词：dielectric composite layer structure low-density polyethylene polyvinylidene fluoride molecular dynamics simulation finite element analysis 

分 类 号：TB3[一般工业技术—材料科学与工程]