Effect of ionic liquid on crystallization kinetics and crystal form transition of poly(vinylidene fluoride) blends
Effect of ionic liquid on crystallization kinetics and crystal form transition of poly(vinylidene fluoride) blends
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发表时间：
2018
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通讯作者：
Limin Wang
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作者：
Hao Zhang;Weihe Shi;Haidong Cheng;Shuangjun Chen;Limin Wang
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 b phase during the recrystallization process, which is confirmed by FTIR and X-ray scattering. This study gives a clue for the development of highquality gel polymer electrolytes.
