温度和存储周期对聚(偏氟乙烯-三氟乙烯)超薄膜极化性能的影响  

Effects of temperature and storage period on polarization of poly(vinylidene fluoride- trifluoroethylene)ultrathin films

作　　者：时志 李兴佳 张修丽 孟祥建[2] 黄志强[1] 张丹丹 徐红霞 SHI Zhi;LI Xing-jia;ZHANG Xiu-li;MENG Xiang-jian;HUANG Zhi-qiang;ZHANG Dan-dan;XU Hong-xia(School of Mathematics,Physics and Statistics,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics of the Chinese Academy of Sciences,Shanghai 200083,China;Research Center for Advanced Mirco-and Nano-Fabrication Materials,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学数理与统计学院,上海201620 [2]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083 [3]上海工程技术大学微纳制造新材料研究中心,上海201620

出　　处：《材料工程》2021年第11期90-97,共8页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51503121);中国科学院上海技术物理研究所红外物理国家重点实验室开放课题(M201914);上海市自然科学基金(17 JC1400302);上海工程技术大学人才行动计划(2018RC54)。

摘　　要：研究不同存放周期条件下聚(偏氟乙烯-三氟乙烯)(P(VDF-TrFE))电容器样品的极化反转性能,分析温度和存放周期对极化反转性能的影响规律。研究结果表明,存放5个月的样品,经过60℃,106次化反转测试,其相对剩余极化强度Pr/Pr0仍高达0.70以上,表现出良好的时效稳定性。通过研究P(VDF-TrFE)样品极化反转性能的演化规律,预测了极化反转调控的P(VDF-TrFE)样品时效稳定性模型。通过模拟P(VDF-TrFE)分子链微观结构演变过程,给出了电活性界面层对分子链中氟化氢气体形成的抑制模型,建立存放周期和测试温度对样品极化性能影响的分子链微观结构机制,进一步验证了界面层作用的陷阱电荷密度减小,同时关联的时效稳定性微观动力学行为。本工作的研究结果为柔性电子器件的应用提供理论参考。The polarization switching properties of P(VDF-TrFE) ultrathin films with different storage periods were measured. The dependence of polarization properties on temperature and storage period was investigated. The experimental results suggest that the relative remanent polarization(Pr/Pr0) remains on a relatively high level of 0.70 at 60 ℃, 106 polarzation swiching test, even to the ultrathin film capacitors stored in atmosphere for five months. The time stability model of polarization switching is predicted by the evolution of polarization switching with the number of electric field cycles. Moreover, when the changes of the molecular chain are simulated by different storage periods and testing temperatures, an inhibited hydrogen fluoride(HF) gas formation scheme in the capacitors was proposed. This work further validated the time stability model and microscopic dynamics associated with trapped charge. These results provide an effective method for designing an optimum protocol for flexible electronic devices based on P(VDF-TrFE) copolymer ultrathin films.

关 键 词：聚(偏氟乙烯-三氟乙烯)超薄膜 时效稳定性 抑制氟化氢生成模型 极化反转 

分 类 号：Q484.4[生物学—生理学]