Tuning ferroelectricity of polymer blends for flexible electrical energy storage applications  

聚合物共混薄膜的铁电特性调控及其柔性储能应用

作　　者：Xin Zhang Yanda Jiang Ruoqi Gao Xinhui Li Zhonghui Shen Bao-Wen Li Qingfeng Zhang Shujun Zhang Ce-Wen Nan 张鑫;江彦达;高若棋;李昕蕙;沈忠慧;李宝文;张清风;张树君;南策文(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Center of Smart Materials and Devices,Wuhan University of Technology,Wuhan 430070,China;International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Lab of Ferro&Piezoelectric Materials and Devices,School of Materials Science&Engineering,Hubei University,Wuhan 430062,China;Institute for Superconducting and Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,North Wollongong,NSW 2500,Australia;School of Materials Science and Engineering,State Key Lab of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,China)

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Center of Smart Materials and Devices,Wuhan University of Technology,Wuhan 430070,China [2]International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [3]Hubei Key Lab of Ferro&Piezoelectric Materials and Devices,School of Materials Science&Engineering,Hubei University,Wuhan 430062,China [4]Institute for Superconducting and Electronic Materials,Australian Institute of Innovative Materials,University of Wollongong,North Wollongong,NSW 2500,Australia [5]School of Materials Science and Engineering,State Key Lab of New Ceramics and Fine Processing,Tsinghua University,Beijing 100084,China

出　　处：《Science China Materials》2021年第7期1642-1652,共11页中国科学（材料科学（英文版）

基　　金：supported by the Basic Science Center Program of the National Natural Science Foundation of China(51788104);the National Natural Science Foundation of China(51802237,52072280,51872214 and 51872079);the Young Elite Scientists Sponsorship Program by CAST(2018QNRC001);the Open Fund of Hubei Key Laboratory of Ferro&Piezoelectric Materials and Devices(K201807);the Fundamental Research Funds for the Central Universities(193201002,183101005 and 182401004)。

摘　　要：Ferroelectric polymers are the mainstay of advanced flexible electronic devices.How to tailor the ferroelectric polymer films for various applications via simple processing approaches is challenging.Here we demonstrate the tuning of ferroelectric responses can be achieved in polymer blends of poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE))and polymethyl methacrylate(PMMA)prepared via a simple two-step process.The proposed two-step process endows the polymer blends with a random distribution of P(VDF-TrFE)crystalline phase,hence decoupling the coherent ferroelectric domain interactions between continuous ordered crystalline phases that ubiquitously existed in common P(VDF-TrFE)film.The incorporation of the miscible non-crystalline PMMA chains with low-polarity results in reversal dipoles and a transition from ferroelectric to antiferroelectric-like behavior,overcoming the trade-off between the polarization and depolarization fields.In particular,resultant excellent mechanical and electrical properties of the polymer blend films give rise to remarkably improved breakdown strength and energy storage performance,surpassing P(VDF-TrFE)and commercial biaxial-oriented polypropylene films.This work provides a simple and effective strategy to tailor the ferroelectric response of polymeric materials with great potential for flexible electrical energy storage applications.铁电聚合物在先进柔性电子器件中通常扮演重要角色,如何调控铁电聚合物薄膜的性能来满足其多样化应用是一个挑战.本文中,我们通过两步法制备了聚偏氟乙烯-三氟乙烯(P(VDFTrFE))与聚甲基丙烯酸甲酯(PMMA)的聚合物共混薄膜并对共混薄膜的铁电特性进行了调控.不同于常规P(VDF-TrFE)薄膜中铁电晶相的连续有序分布,两步法工艺可以实现聚合物共混薄膜中P(VDF-TrFE)晶相的随机分布,进而打破常规铁电聚合物薄膜中相邻晶相铁电畴间的耦合作用;在此基础上,共混薄膜非晶区内的低极性PMMA组分可以通过降低去极化电场来调节偶极子的翻转行为,使共混薄膜由铁电特性转变为类反铁电特性;此外,铁电聚合物共混薄膜优异的力学与电学性能可以显著提升其击穿强度,最终获得明显优于纯P(VDF-TrFE)薄膜和商业双轴拉伸聚丙烯薄膜的超高储能密度.本论文提出了一种调控聚合物材料铁电特性的有效策略,为高储能密度铁电聚合物薄膜材料的发展带来巨大潜力.

关 键 词：ferroelectric polymers ANTIFERROELECTRICITY energy density breakdown strength DIELECTRIC 

分 类 号：TQ317[化学工程—高聚物工业] TB383.2[一般工业技术—材料科学与工程]