Optimizing Strategy for the Dielectric Performance of Topological-structured Polymer Nanocomposites by Rationally Tailoring the Spatial Distribution of Nanofillers

Liang Sun,1

Liang Liang,1

Zhicheng Shi,1,*Email

Huanlei Wang,1

Peitao Xie,2,*Email 

Davoud Dastan,3

Kai Sun4

Runhua Fan4

1School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

2State Key Laboratory of Bio-fibers and Eco-textiles, Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China

3Department of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia-30332, USA

4Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

Abstract

There is a mindset that functional fillers tend to be as homogeneous as possible to achieve high dielectric constant and low loss when designing polymer dielectric composites. This study breaks the mindset by proposing a novel inhomogenous design in a topological-structured polymer nanocomposite, the dielectric performance is optimized by rationally controlling the spatial distribution of nanofillers. We prepared layered composites where BaTiO3 and TiN nanoparticles were dispersed in the top and bottom section of the P(VDF-HFP) composites, respectively. Interestingly, the layered inhomogenous composites exhibit obviously enhanced dielectric permittivity (1.5 times as high), suppressed loss (a 70 % drop) and improved breakdown strengths (4.2 times as high) compared with their single-layer homogenous counterparts. This dielectric optimization is mainly attributed to the design of multilevel interfaces and the redistribution of polarization charges in the inhomogenous topological structure. This research provides a novel optimizing strategy and will promote the development of dielectrics.

Optimizing Strategy for the Dielectric Performance of Topological-structured Polymer Nanocomposites by Rationally Tailoring the Spatial Distribution of Nanofillers