Abstract
The structural and electrophysical characteristics of poly (vinylidene fluoride-hexafluoropropylene) copolymer films with hexafluoropropylene content 8.3 mol%, obtained by low-temperature crystallization from various solvents, have been investigated. X-ray diffraction data indicate that the films crystallized mainly in the α-phase. When acetone is used as a solvent, the degree of crystallinity is the lowest due to the rapid escape of solvent molecules from solution. IR spectroscopic data showed that the amorphous phase of such films is enriched with T3GT3G− isomers. This is accompanied by an increase in their high-voltage conductivity. Despite the crystallization mainly in nonpolar α-phase, a domain structure was recorded in the films by piezo force microscopy. Surface structuring processes, accompanied by the displacement of certain attachment chain defects into the surface, have been recorded using IR spectroscopy. The presence of such intrachain defects is confirmed and characterized by high-resolution 19F NMR.
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Acknowledgements
The NMR spectra were recorded on the spectrometers of the Shared Facility Centers at IGIC RAS and IPCE RAS. The authors are grateful to Dr. N.A. Shmakova (Karpov Institute of Physical Chemistry RAS) for the measurements of IR spectra.
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DSC measurements were performed with the financial support from Ministry of Science and Higher Education of Russian Federation using the equipment from the Center for Molecular Composition Studies of INEOS RAS.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by VVK, MAG, OVG, AAM, IAM, GAK, DAK, RAC, MGT, AIZ, BVL, and MIB. The first draft of the manuscript was written by VVK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Kochervinskii, V.V., Gradova, M.A., Gradov, O.V. et al. Structure formation and electrophysical properties of poly(vinylidene fluoride-hexafluoropropylene) copolymer films at low-temperature solution crystallization. Colloid Polym Sci 300, 721–732 (2022). https://doi.org/10.1007/s00396-022-04983-1
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DOI: https://doi.org/10.1007/s00396-022-04983-1