期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 132, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/app.41456
关键词
crystallization; differential scanning calorimetry (DSC); glass transition; ionic liquids; mechanical properties
资金
- Board of Research in Nuclear Sciences - Department of Atomic Energy (BRNS-DAE), Mumbai
- University Grants Commission (UGC), New Delhi, India
Polymeric gel electrolyte membranes based on the polymer poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HFP)] with different weight percentages of the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate plus 0.3 M lithium tetrafluoroborate (LiBF4) salt were prepared and characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, Fourier transform infrared (FTIR) spectroscopy, complex impedance spectroscopy, pulse echo techniques, and Vickers hardness (H) testing. After the incorporation of the IL plus the salt solution in the P(VdF-HFP) polymer, the melting temperature, glass-transition temperature (T-g), degree of crystallinity, thermal stability, elastic modulus (E), and hardness (H) gradually decreased with increasing content of the IL-salt solution as a result of complexation between the P(VdF-HFP) and IL. This was confirmed by FTIR spectroscopy. A part of the IL and LiBF4 were found to remain uncomplexed as well. The ionic conductivity (sigma) of the polymeric gel membranes was found to increase with increasing concentration of the IL-salt solution. The temperature-dependent sigma s of these polymeric gel membranes followed an Arrhenius-type thermally activated behavior. (C) 2014 Wiley Periodicals, Inc.
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