Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)-Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications |
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Authors: | Liwei Zhang Shuangfeng Li Zhiwen Zhu Guanchun Rui Bin Du Dazhu Chen Yan-Fei Huang Lei Zhu |
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Affiliation: | 1. College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055 P. R. China;2. Engineering Research Center of Novel Equipment for Polymer Processing, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou, 510641 P. R. China;3. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106-7202 USA |
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Abstract: | Poly(vinylidene fluoride) (PVDF)-based polymers demonstrate great potential for applications in flexible and wearable electronics but show low piezoelectric coefficients (e.g., ?d33 < 30 pC N?1). The effective improvement for the piezoelectricity of PVDF is achieved by manipulating its semicrystalline structures. However, there is still a debate about which component is the primary contributor to piezoelectricity. Therefore, current methods to improve the piezoelectricity of PVDF can be classified into modulations of the amorphous phase, the crystalline region, and the crystalline–amorphous interface. Here, the basic principles and measurements of piezoelectric coefficients for soft polymers are first discussed. Then, three different categories of structural modulations are reviewed. In each category, the physical understanding and strategies to improve the piezoelectric performance of PVDF are discussed. In particular, the crucial role of the oriented amorphous fraction at the crystalline–amorphous interface in determining the piezoelectricity of PVDF is emphasized. At last, the future development of high performance piezoelectric polymers is outlooked. |
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Keywords: | electrostriction ferroelectric phase oriented amorphous fraction piezoelectricity poly(vinylidene fluoride) |
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