The effects of chlorotrifluoroethylene (CTFE) units on the dielectric and energy storage properties of P(VDF-CTFE)

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Haoran Xie, Xi Yuan, Hang Luo, Dou Zhang
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Abstract

Polyvinylidene fluoride-based ferroelectric polymers are favoured in the field of advanced high-energy-storage dielectric capacitors due to their strong spontaneous polarisation and high dielectric constant (εr). It has been confirmed that the ferroelectric behaviour and energy storage performance can be regulated by copolymerising polyvinylidene fluoride with bulky monomers such as chlorotrifluoroethylene, and hexafluoropropylene. Past research based on these copolymers mostly focused on the preparation of composites, yet with limited discussion on the effect of copolymer composition. In this work, a series of P(VDF-CTFE) films with different chlorotrifluoroethylene contents were fabricated through a solution-casting method. The introduction of bulky chlorotrifluoroethylene units can tune the polymer crystal structure and crystallinity, alter the state of polymer chains and the response of dipoles to electric fields, and lead to dramatic changes in dielectric properties, breakdown strength (Eb), and energy storage density (Ue). As a result, the copolymer with a chlorotrifluoroethylene content of 15 wt% obtained the best overall performance, and the Ue reached 16.73 J/cm3 at 650 kV/mm. This work provides a basis for the optimisation of the properties of polyvinylidene fluoride-based ferroelectric polymers and the development of high Ue dielectric.

Abstract Image

三氟氯乙烯 (CTFE) 单元对 P(VDF-CTFE) 介电和储能特性的影响
聚偏氟乙烯基铁电聚合物具有强自发极化性和高介电常数(εr),因此在先进的高储能介质电容器领域备受青睐。研究证实,聚偏氟乙烯与氯三氟乙烯和六氟丙烯等大体积单体共聚可调节铁电行为和储能性能。以往基于这些共聚物的研究大多集中于复合材料的制备,但对共聚物成分的影响讨论有限。在这项研究中,我们通过溶液浇铸法制备了一系列氯代三氟乙烯含量不同的 P(VDF-CTFE)薄膜。引入大体积的三氟氯乙烯单元可以调整聚合物晶体结构和结晶度,改变聚合物链的状态和偶极子对电场的响应,并导致介电性能、击穿强度(Eb)和储能密度(Ue)发生巨大变化。结果,氯三氟乙烯含量为 15 wt% 的共聚物获得了最佳的综合性能,在 650 kV/mm 时,Ue 达到 16.73 J/cm3。这项研究为优化聚偏氟乙烯基铁电聚合物的性能和开发高 Ue 介电体奠定了基础。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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