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Manipulation of crystallization and dielectric relaxation dynamics via hot pressing and copolymerization of PVDF with Hexafluoropropylene

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Abstract

PVDF and its copolymers have gained much interest recently as they can be utilized in a wide range of technological applications. In present work the effect on the physical properties via variation in the synthesis conditions and copolymerization of PVDF is discussed in detail. PVDF and P(VDF-HFP) free standing films have been synthesized by solvent casting and hot-pressing methods. Structural and electrical properties reveal that α-phase is dominantly present when the PVDF is processed via hot pressing technique. Addition of HFP significantly degrades the crystallinity of the polymers. While hot pressing significantly effects the crystallinity, phase type and dielectric properties. In solvent casting technique the molecular interaction between PVDF and solvent is a key parameter for observation of β-phase and low crystallinity. In solvent casted films single relaxation peak along with the Maxwell–Wagner like response, have been observed in the dielectric response. In hot press samples, an additional dielectric relaxation peak known as αc-relaxation has been observed which exhibits higher activation energy. αc-relaxation arise due to the dipole molecular movements in crystalline region of PVDF. The first relaxation peak is associated with the glass transition temperature, while improved crystalline nature with hot pressing and dominance of α-phase, confirms that the second relaxation arises due to the dipoles present in this crystal region.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

GHJ acknowledges the support of the Pakistan Science Foundation for funding this research work (Project No. PSF/TUBITAK-III/Biomed/C/QAU).

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  1. Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan

    G. Hassnain Jaffari, M. Shahid Iqbal Khan, Fiza Mumtaz & Nawazish Ali Khan

  2. School of Materials Science and Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei, Nanjing, 210094, China

    Y. Wang

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Jaffari, G.H., Khan, M.S.I., Mumtaz, F. et al. Manipulation of crystallization and dielectric relaxation dynamics via hot pressing and copolymerization of PVDF with Hexafluoropropylene. J Polym Res 30, 11 (2023). https://doi.org/10.1007/s10965-022-03395-7

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