Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/64622

TitleInfluence of cation and anion type on the formation of the electroactive β-phase and thermal and dynamic mechanical properties of poly(vinylidene fluoride)/ionic liquids bends
Author(s)Correia, D. M.
Costa, Carlos Miguel Silva
Lizundia, E.
Sabater I Serra, R.
Gómez-Tejedor, J. A.
Biosca, L.T.,
Meseguer-Dueñas, J. M.
Gomez Ribelles, J. L.
Lanceros-Méndez, S.
Issue date2019
PublisherACS Publications
JournalThe Journal of Physical Chemistry C
Abstract(s)Films based on poly(vinylidene fluoride) (PVDF) blended with ionic liquids (ILs) comprising different cations and anions were developed to investigate the IL influence on the resulting PVDF crystalline phase. Blends with 25 wt % IL content were produced by solvent casting followed by solvent evaporation at 210 °C in an air oven. Five different ILs containing the same cation 1-ethyl-3-methylimidazolium [Emim] and five ILs containing the same anion bis(trifluoromethylsulfonyl)imide [TFSI] were selected. The formation of the different phases and the resulting thermal and dynamic mechanical properties were studied by Fourier transform infrared spectroscopy, differential scanning calorimetry, and dynamic mechanical analysis. The incorporation of [Emim]-based ILs successfully directs the PVDF crystallization from the nonpolar α-phase toward the electroactive and highly polar β-phase. On the contrary, blends containing [TFSI] as a common anion yield a mixture of α and β phases. Overall, the induced β-phase ranges between 14 and 95% depending on the incorporated IL type. Interestingly, 1-ethyl-3-methylimidazolium chloride [Emim][Cl] is the most effective IL among the studied ones to significantly enhance the β-phase content, showing also a marked nucleating effect. The results suggest that ions favorably interact with PVDF chains and are located occupying the amorphous interlamellar PVDF regions. Furthermore, the studied ILs act as plasticizers, yielding lower glass-transition temperatures of the amorphous phase and decreasing mechanical storage modulus at room temperature.
TypeArticle
URIhttp://hdl.handle.net/1822/64622
DOI10.1021/acs.jpcc.9b07986
ISSN1932-7447
e-ISSN1932-7455
Publisher versionhttps://pubs.acs.org/doi/10.1021/acs.jpcc.9b07986
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:FUNCTIONAL AND SMART MATERIALS AND SURFACES FOR ADVANCED APPLICATIONS (2018 - ...)
CDQuim - Artigos (Papers)

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