静电纺丝法制备聚偏二氟乙烯-六氟丙烯电解质膜用于电化学执行器  

Preparation of Polyvinylidene Fluoride-Hexafluoropropylene Electrolyte Membrane by Electrospinning Method for Electrochemical Actuators

作　　者：汪莎莎 孟鹏辉 李阳[1] 邓慧婵 郭志翔 刘一任 石乃恩 魏颖[1] 解令海[1] Wang Shasha;Meng Penghui;Li Yang;Deng Huichan;Guo Zhixiang;Liu Yiren;Shi Naien;Wei Ying;Xie Linghai(Centre for Molecular Systems and Organic Devices(CMSOD),State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China;Fujian Cross Strait Institute of Flexible Electronics(Future Technology),Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]南京邮电大学信息材料与纳米技术研究院有机电子与信息显示国家重点实验室分子系统与有机器件研究中心,南京210023 [2]福建师范大学海峡柔性电子(未来科技)研究院,福州350117

出　　处：《化学学报》2024年第6期570-576,共7页Acta Chimica Sinica

基　　金：南京邮电大学自然科学基金(NY222157,NY221085);有机电子与信息显示国家重点实验室(GZR2022010008);江苏省低维材料化学重点实验室开放课题(JSKC20022);国家留学基金(202008320051);国家基础科学中心(62288102)资助。

摘　　要：本研究采用静电纺丝法制备了两种具有不同纤维直径的聚偏二氟乙烯-六氟丙烯(PVDF-HFP)电解质薄膜用于电化学执行器.相比于滴涂薄膜,电纺薄膜具有出色的柔韧性和大量孔隙结构,其中粗纤维薄膜(PVDF-HFP22%(w))表现出更好的拉伸断裂应力(7.52 MPa)、拉伸断裂伸长率(235%)和器件面电容(39.8 mF·cm^(-2)).在±0.5 V, 0.1 Hz的低驱动电压下,粗纤维薄膜制备的电化学执行器的驱动位移为9.6mm,相比于细纤维执行器的6.5mm和滴涂薄膜执行器的2.6 mm分别提升了1.48倍和3.69倍.当电压升高到±2 V, 0.1 Hz时,粗纤维薄膜执行器驱动位移为24.3 mm,分别是细纤维执行器的1.19倍和滴涂样品的1.46倍.该工作为制备大驱动位移电化学执行器提供了新的思路与方法.The microstructure of the electrolyte layer in electrochemical actuators significantly influences ion storage and transport,mechanical properties,and the final actuator deformation performance.In this study,two types of polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)electrolyte films with varying fiber diameters were prepared by electrospinning for electrochemical actuators.We controlled the diameters of the fibers by adjusting the concentrations of the polymer solu-tion,while the film is carefully controlled to a consistent size in length,width,and thickness.Subsequently,the fiber film was immersed in the ionic liquid to achieve excellent electrolyte film performance.A poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)electrode thin film was prepared using a drop coating method.Finally,an electro-chemical actuator was prepared by hot pressing the electrode and electrolyte films.Compared with the drop-coated electro-lyte film,the electrospun counterparts exhibit an excellent flexibility and a porous structure.Among them,the film with a larger fiber diameter(PVDF-HFP 22%(w))reveals better tensile stress(7.52 MPa),tensile strain(235%),porosity(74%)and surface capacitance(39.8 mF•cm^(-2)),and its tip displacement is 9.6 mm at±0.5 V and 0.1 Hz,which is 1.48 times that of the smaller fiber diameter sample(PVDF-HFP 16%(w))and 3.69 times that of the drop-coated sample,respectively.When at±2 V and 0.1 Hz,the displacement is as high as 24.3 mm,which is 1.19 times that of the smaller fiber diameter sample(PVDF-HFP 16%(w))and 1.46 times that of the drop-coated sample,respectively.Under the driving voltage of±0.5 V and 0.1 Hz,after 10000 cycles,the driving displacement of PVDF-HFP 22%(w)electrochemical actuator can still reach 98%compared with the initial state.By improving the microstructures of electrolyte films through electrospinning,we successful-ly realized the preparation of high-performance electrochemical actuators,which provides a new idea for the development of soft robots in the future

关 键 词：静电纺丝 聚偏二氟乙烯-六氟丙烯 电解质膜 电化学执行器 纤维直径 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置] TQ340.64[自动化与计算机技术—控制科学与工程] TB383.2[化学工程—化纤工业]