Abstract In recent years, PVDF(polyvinylidene fluoride) and its copolymers have attracted great attention in the development of energy-harvesting devices because of their unique properties such as good flexibility, environmental friendliness, high halogen and acid resistance, lightweight and good biocompatibility. Compared to the most commonly used PZT (lead zirconate titanate), the piezoelectricity of PVDF and its copolymer-based materials is relatively low. To further expand the applications of PVDF, there is an urgent need for efficient methods to prepare high piezoelectric polymers or composites. In this work, the crystal phases are introduced first. Then, the preparation methods of PVDF and its copolymer-based materials are summarized, which are mainly focused on four determining factors of piezoelectricity. The mechanisms of piezoelectric β-phase formation and α- to β-phase transformation are introduced. The influence parameters of each process and their interactions are discussed in detail. In the last section, the progress of the preparation methods is summarized. This work will provide useful information to researchers working on piezoelectric composites.

中文翻译：

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PVDF基压电材料制备的最新进展

摘要 近年来，PVDF（聚偏二氟乙烯）及其共聚物以其柔韧性好、环境友好、高耐卤耐酸、重量轻、生物相容性好等独特性能，在能量收集装置的开发中引起了广泛关注。与最常用的 PZT（锆钛酸铅）相比，PVDF 及其共聚物基材料的压电性相对较低。为了进一步扩大 PVDF 的应用，迫切需要高效的方法来制备高压电聚合物或复合材料。在这项工作中，首先介绍了晶相。然后，总结了PVDF及其共聚物基材料的制备方法，主要集中在压电性的四个决定因素。介绍了压电 β 相的形成机制和 α 到 β 相的转变。详细讨论了每个过程的影响参数及其相互作用。最后一节总结了制备方法的进展。这项工作将为研究压电复合材料的研究人员提供有用的信息。