Electrostriction-enhanced giant piezoelectricity via relaxor-like secondary crystals in extended-chain ferroelectric polymers
Electrostriction-enhanced giant piezoelectricity via relaxor-like secondary crystals in extended-chain ferroelectric polymers
复制标题
通过长链铁电聚合物中的弛豫类二次晶体实现电致伸缩增强巨压电性
DOI：
10.1016/j.matt.2021.09.008
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发表时间：
2021
期刊：
影响因子：
18.9
通讯作者：
Zhu Lei
中科院分区：
文献类型：
--
作者：
Zhu Zhiwen;Rui Guanchun;Li Qiong;Allahyarov Elshad;Li Ruipeng;Soulestin Thibaut;Dos Santos Fabrice Domingues;He Hezhi;Taylor Philip L.;Zhu Lei
铁电聚合物中的压电性源自与剩余极化相结合的电致伸缩效应。然而，其结构起源仍存在争议，目前尚不清楚改变电致伸缩如何进一步提高聚合物的压电性。在这里，我们报道了在取向无定形部分（SCOAF）中含有长链初级晶体和松弛剂状次级晶体的极化聚（偏二氟乙烯-三氟乙烯）[P(VDF-TrFE)]无规共聚物中的电致伸缩可以显着增强。由于 SCOAF 中偶极子和铁电纳米域的高极化性，P(VDF-TrFE) 55/45 共聚物在 55°C 时的逆压电系数 d31 高达 77 ± 5 pm/V。这一发现不仅扩展了我们对聚合物压电性的理解，而且为未来进一步增强铁电聚合物的压电性提供了指导。
Piezoelectricity in ferroelectric polymers originates from the electrostrictive effect coupled with a remanent polarization. However, its structural origin remains controversial, and it is not clear how modifying the electrostriction can further improve piezoelectricity for polymers. Here, we report that electrostriction can be significantly enhanced in poled poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] random copolymers containing extended-chain primary crystals and relaxor-like secondary crystals in the oriented amorphous fraction (SCOAF). As a result of the high polarizability of dipoles and ferroelectric nanodomains in the SCOAF, the inverse piezoelectric coefficient d31reaches as high as 77 ± 5 pm/V for the P(VDF-TrFE) 55/45 copolymer at 55°C. This finding not only extends our understanding of piezoelectricity in polymers but also provides guidance for further enhancing the piezoelectricity of ferroelectric polymers in the future.