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.

中文翻译：

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伊利石对聚偏二氟乙烯结晶的影响

通过溶剂浇铸法将聚偏二氟乙烯（PVDF）与十六烷基三甲基溴化铵（CTAB）改性的伊利石混合。详细研究了改性伊利石的含量和温度对γ相PVDF结晶的影响。未改性的伊利石不会影响PVDF的结晶。相反，由于PVDF和改性伊利石之间的静电相互作用，改性伊利石可以有效地促进γ相的成核。对于改性伊利石含量低的PVDF，例如0.5 wt％，与纯PVDF相比，在155°C下获得γ相的能力得到增强。提高结晶温度或改性伊利石的含量有助于形成更多的γ相。不论结晶温度如何，掺合2.0％改性伊利石都会产生纯γ相。