期刊
CARBON
卷 81, 期 -, 页码 329-338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.09.065
关键词
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资金
- Converging Research Center Program [2014M3C1A8048834]
- Basic Research Laboratory Program through the Ministry of Science, ICT & Future Planning [2014R1A4A1008140]
- Basic Science Research Program through the National Research Foundation (NRF) [2013R1A1A2011608]
- Ministry of Education of Korea
Sulfonated poly(ether-ether-ketone) functionalized graphene oxide (SPG)/poly(vinylidene fluoride) (PVDF) composites have been prepared by a solvent evaporation technique. The -SO3H group of SPG interact with the >CF2 dipole of PVDF to integrate graphene uniformly into a PVDF matrix. The cross-sectional field emission scanning electron microscopy micrograph shows folded-chain lamella of spherulitic PVDF crystallites spread outwards from the growth center. The spherulitic crystallites decrease with the incorporation of SPG into the PVDF matrix and the composite containing 3 wt.% SPG (SPG3) does not show spherulite, but fiber-like crystallites. Fourier transform infrared spectroscopy, wide angle X-ray scattering and differential scanning calorimetry (DSC) results suggest that piezoelectric b-polymorph formation begins with the incorporation of SPG into the PVDF matrix, and SPG3 shows the formation of the fully b-polymorph. DSC cooling curves show that SPG acts as an effective nucleating agent for the crystallization of PVDF. Study of the mechanical properties shows that there is a simultaneous enhancement of the stress and the strain at break indicating the enhanced toughness of the PVDF composites compared to pure PVDF. Young's modulus increases 160% and the oxygen permeability coefficient decreases by 91% in the SPG3 composite film compared to pure PVDF. (C) 2014 Elsevier Ltd. All rights reserved.
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