Vinylidene fluoride (VDF)/tetrafluoroethylene (TFE) 94/6 copolymer films obtained by low-temperature crystallization from acetone solution and by melt-crystallization under high pressure were studied. As shown in the X-ray diffraction patterns, β- and γ- phases coexist in the sample crystallized from a solution. At melt-crystallization, a number of γ-crystals decrease and spherulitic supramolecular structure is formed. It is accompanied by a decrease of the amorphous phase density in the intra- and inter-spherulite regions, which leads to an increase in the glass transition temperature. Differential scanning calorimetry data indicate a smaller fraction of the amorphous phase for the sample crystallized from the melt. At the same time, the relaxation strength of the mobility in the amorphous phase in this sample is higher. This contradiction is explained by the increased ratio of isomers in planar zigzag conformation, as shown by IR spectroscopy.

中文翻译：

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铁电偏二氟乙烯-四氟乙烯共聚物在不同结晶条件下的结构特性和介电弛豫特性

研究了通过从丙酮溶液中低温结晶和高压熔融结晶获得的偏二氟乙烯 (VDF)/四氟乙烯 (TFE) 94/6 共聚物薄膜。如 X 射线衍射图所示，β 相和 γ 相共存于从溶液中结晶的样品中。在熔融结晶时，许多γ-晶体减少并形成球晶超分子结构。它伴随着球晶内和球晶间区域中非晶相密度的降低，这导致玻璃化转变温度的升高。差示扫描量热法数据表明从熔体结晶的样品的无定形相的比例较小。同时，该样品中非晶相中迁移率的弛豫强度更高。