Since the discovery of piezoelectricity in poly(vinylidene fluoride) (PVDF) 50 years ago, ferroelectric polymers have established their own areas for research and applications due to their unique properties in comparison to single crystals and inorganics. PVDF is a semicrystalline polymer that can crystallize into five different polymorphs. Among them, the polar β-phase is the most interesting one for electroactive properties because it has the highest dipolar moment and the highest piezoelectric response. In the early days, the β-PVDF was typically produced by melt processing, limiting its form to free-standing films. The rapid development of flexible electronics, however, highly requires β-PVDF fabricated from solutions under mild conditions. The objective of this perspective is to summarize the effective methods to produce β-PVDF from solution, to present the approaches for enhancing the electroactive properties through morphological controls, and to discuss the applications of PVDF-based ferroelectric polymers in flexible electronics. In addition, current challenges that may impede the further development of this field are pointed out.

中文翻译：

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用于柔性电子产品的可溶液加工的聚偏二氟乙烯基铁电聚合物

自50年前在聚偏二氟乙烯（PVDF）中发现压电性以来，铁电聚合物由于与单晶和无机物相比具有独特的性能而建立了自己的研究和应用领域。PVDF是一种半结晶聚合物，可以结晶为五个不同的多晶型物。其中，极性β相是电活性性质中最有趣的一种，因为它具有最高的偶极矩和最高的压电响应。早期，β-PVDF通常是通过熔融加工生产的，将其形式限于独立式薄膜。但是，柔性电子产品的快速发展非常需要在温和条件下由溶液制成的β-PVDF。该观点的目的是总结从溶液中制备β-PVDF的有效方法，介绍了通过形态控制增强电活性的方法，并讨论了基于PVDF的铁电聚合物在柔性电子中的应用。此外，指出了可能阻碍该领域进一步发展的当前挑战。