Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 1153–1165 | Cite as

Effect of ionic liquid on crystallization kinetics and crystal form transition of poly(vinylidene fluoride) blends

  • Hao Zhang
  • Weihe Shi
  • Haidong Cheng
  • Shuangjun Chen
  • Limin Wang
Article
  • 47 Downloads

Abstract

Semicrystalline poly(vinylidene fluoride) (PVDF) incorporated with ionic liquids(IL) exhibits applicability as electrolyte. In this paper, crystallization kinetics and crystal form transition of PVDF blending with ionic liquid (1-hexyl-3-methylimidazolium chloride, [HMIM]Cl) were studied by using differential scanning calorimetry, Fourier transform infrared spectroscopy (FTIR), and X-ray scattering. Tg of the PVDF/[HMIM]Cl blends are higher than that of the pure PVDF, suggesting the strong interaction between [HMIM]Cl and molecular chains of PVDF. With the ionic liquid content increased, both the conductivities of solvent casting and reheated films increased with little difference between them when the [HMIM]Cl content is same. For normalization, we introduce relative time tr to replace t to eliminate the influence of cooling rate. Pure PVDF had the fastest crystallization rate through the crystallization kinetics. By addition of the [HMIM]Cl, the tr1/2 has a positive correlation, while the XtA has negative correlation with the degree of crystallization of the PVDF/[HMIM]Cl blends. What’s more, [HMIM]Cl promotes the formation of PVDF β phase during the recrystallization process, which is confirmed by FTIR and X-ray scattering. This study gives a clue for the development of high-quality gel polymer electrolytes.

Keywords

Poly(vinylidene fluoride) Electrolyte Ionic liquid Crystallization kinetics Crystal form transition 

Notes

Acknowledgements

The authors are grateful to National Natural Science Foundation of China (No. 21504042) for financial support of this work. This project is also funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringNanjing Tech UniversityNanjingPeople’s Republic of China

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