Core@Double-Shell Structured Nanocomposites: A Route to High Dielectric Constant and Low Loss Material.
This work reports the advances of utilizing a core@double-shell nanostructure to enhance the electrical energy storage capability and suppress the dielectric loss of polymer nanocomposites. Two types of core@double-shell barium titanate (BaTiO3) matrix-free nanocomposites were prepared using a surface initiated atom transfer radical polymerization (ATRP) method to graft a poly(2-hydroxylethyle methacrylate)-block-poly(methyl methacrylate) and sodium polyacrylate-block-poly(2-hydroxylethyle methacrylate) block copolymer from BaTiO3 nanoparticles. The inner shell polymer is chosen to have either high dielectric constant or high electrical conductivity to provide large polarization, while the encapsulating outer shell polymer is chosen to be more insulating as to maintain a large resistivity and low loss. Finite element modeling was conducted to investigate the dielectric properties of the fabricated nanocomposites and the relaxation behavior of the grafted polymer. It demonstrates that confinement of the more conductive (lossy) phase in this multishell nanostructure is the key to achieving a high dielectric constant and maintaining a low loss. This promising multishell strategy could be generalized to a variety of polymers to develop novel nanocomposites.
Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University , Shanghai 200240, China.|Department of Materials Science and Engineering, Rensselaer Polytechnic Institute , Troy, New York 12180, United States.
Yanhui
Y
Huang
Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University , Shanghai 200240, China.
Xingyi
X
Huang
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute , Troy, New York 12180, United States.
Linda S
LS
Schadler
State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University , Beijing 100084, China.
Jinliang
J
He
Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University , Shanghai 200240, China.
Pingkai
P
Jiang
ATRP; BaTiO3; core@double-shell; high dielectric constant; low loss; nanocomposites