期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 73, 期 -, 页码 85-92出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2015.02.015
关键词
Polymer-matrix composites (PMCs); Electrical properties; Mechanical properties; Atomic force microscopy
资金
- National Natural Science Foundation of China [51173112, 21274095]
- Special Funds for Major State Basic Research Projects of China [2011CB606006]
Graphene with polydopamine (PDA) coating layer which displays promoted dispersibility in organic solvent was prepared through self-polymerization of dopamine onto graphene oxide (GO) and subsequent chemical reduction. The PDA coated reduced GO (RDGO) is homogeneously incorporated into poly(vinylidene fluoride) (PVDF) matrix, which exhibit a percolation threshold at 0.643 wt%. The dielectric constant of PVDF with 0.70 wt% RDGO increases to 176, about 17 times of neat PVDF. Importantly, the loss tangent is suppressed to 0.337 due to reduction of the concentration and mobility of ionizable carboxylic groups by PDA. The enhancement of dielectric constant probably rises from duplex interfacial polarization induced by graphene-semiconductor interface, and semiconductor-insulator interface. The composites displays advantages in excellent dielectric properties and good flexibility and processability guaranteed by low loading of RDGO, which is suitable for the development of dielectric materials for energy storage. (C) 2015 Elsevier Ltd. All rights reserved.
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