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A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

机译：FTIR临界分析聚偏二氟乙烯中的α，β和γ相

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Poly(vinylidene fluoride) (PVDF) has been widely utilized in scientific research and the manufacturing industry for its unique piezoelectric properties. In the past few decades, the vibrational spectra of PVDF polymorphic polymers via FTIR (Fourier transform infrared spectroscopy) have been extensively investigated and documented. However, reports on the analysis of α, β and γ phases often have conflicting views based on measured data. In this work, we analyze the FTIR vibrational bands of PVDF materials fabricated by different processes with detailed XRD (X-ray diffraction) characterization to identify the structural α, β and γ phases. By examining the results in this work and extensively reviewing published research reports in the literature, a universal phase identification procedure using only the FTIR results is proposed and validated. Specifically, this procedure can differentiate the three phases by checking the bands around 763 and/or 614, 1275, and 1234 cm?1 for the α, β and γ phases, respectively. The rule for assignment of the 840* and 510* cm?1 bands is provided for the first time and an integrated quantification methodology for individual β and γ phase in mixed systems is also demonstrated.
机译：聚偏二氟乙烯（PVDF）因其独特的压电性能而被广泛用于科学研究和制造业。在过去的几十年中，通过FTIR（傅里叶变换红外光谱法）对PVDF多晶型聚合物的振动光谱进行了广泛的研究和记录。然而，基于测量数据，有关α，β和γ相分析的报告常常存在冲突的观点。在这项工作中，我们分析了通过不同工艺制造的PVDF材料的FTIR振动带，并进行了详细的XRD（X射线衍射）表征，以识别结构的α，β和γ相。通过检查这项工作的结果并广泛审查文献中已发表的研究报告，提出并验证了仅使用FTIR结果的通用阶段识别程序。具体来说，此程序可以通过检查763和/或614、1275和1234 cm ？1 的α，β和γ附近的频带来区分三个相位，分别。首次提供了840 *和510 * cm ？1 波段的分配规则，并且为混合系统中单个β和γ相的集成定量方法是也证明了。

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