title: Graphene encapsulated rubber latex composites with high dielectric constant, low dielectric loss and low percolation threshold.
abstract: A dielectric composite with high dielectric constant, low dielectric loss and low percolation threshold was prepared by using the combined strategy of encapsulating of graphene oxide nanosheets (GONS) on carboxylated nitrile rubber (XNBR) latex particles and the in situ thermal reduction in GONS at a moderate temperature. The encapsulation of GONS on XNBR latex particles was mainly realized via the hydrogen bonding interactions between GONS and XNBR during latex mixing. A segregated graphene network was obtained at a low content of thermally reduced graphene (TRG), resulting in a low percolation threshold (0.25 vol.%). The dielectric constant at 100 Hz obviously increased from 23 for pure XNBR to 2211 and 5542 for the composite with 0.5 vol.% and 0.75 vol.% of TRG, respectively. The dielectric loss of the composites retained at a low value (less than 1.5). Meanwhile, the elastic modulus only slightly increased with the presence of 0.1-0.5 vol.% of TRG, keeping the good flexibility of the dielectric composites. This study provides a simple, low-cost and effective method to prepare high performance dielectric composites, facilitating the wide application of dielectric materials.
authors: State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Ming
authors: M
authors: Tian
authors: Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Jing
authors: J
authors: Zhang
authors: State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Liqun
authors: L
authors: Zhang
authors: Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Suting
authors: S
authors: Liu
authors: Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
authors: Xiaoqing
authors: X
authors: Zan
authors: Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, Japan.
authors: Toshio
authors: T
authors: Nishi
authors: State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: ningny@mail.buct.edu.cn.
authors: Nanying
authors: N
authors: Ning
keywords: Dielectric properties; Graphene; Latex mixing; Percolation threshold