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Effect of Illite on Crystallization of Poly(vinylidene fluoride)

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journal contribution
posted on 17.02.2020, 20:34 by Tiantian Song, Shaojuan Wang, Haijun Wang, Xiaoli Sun, Huihui Li, Shouke Yan
Poly­(vinylidene fluoride) (PVDF) was blended with cetyltrimethylammonium bromide (CTAB)-modified illite through a solvent-casting method. The effects of the content of modified illite and temperature on γ-phase PVDF crystallization were studied in detail. Unmodified illite does not affect the crystallization of PVDF. By contrast, modified illite can effectively boost the nucleation of the γ-phase due to the electrostatic interaction between PVDF and modified illite. For PVDF with low contents of modified illite, for example, 0.5 wt %, the ability to obtain the γ-phase is enhanced at 155 °C compared with neat PVDF. Increasing the crystallization temperature or the content of modified illite facilitates to form more γ-phase. Blending of 2.0% modified illite generates a pure γ-phase regardless of crystallization temperature. The technique to prepare pure γ-phase PVDF materials has a huge potential application in the fabrication of cheap pyro- or piezoelectric devices.