双稳态电致变色离子凝胶的制备及其在织物上的应用

Preparation of bistable electrochromic ion gels and their applications for fabric display devices

为研制一种具有高弹性和双稳态特性的电致变色材料用于柔性电子显示器件,采用溶液聚合法制备了一种基于氢键交联网络的聚丙烯酸2-羟乙酯(PHEA)离子凝胶。借助荧烷染料内酯环与聚合物羟基单元之间形成的氢键作用赋予了荧烷染料颜色稳态性。采用拉力试验机测试了PHEA离子凝胶的力学性能;联用电化学工作站和分光光度仪表征了离子凝胶器件的透明度、电致变色性能和双稳态性能。结果表明:PHEA离子凝胶具有出色的拉伸强度(537 kPa)和拉伸回弹性(436%);组装得到的器件具备优异的响应性(16.5 s)、高颜色对比度(>80%)、稳态时间(45 h)以及可逆变色性(>1000次循环)。该离子凝胶在可拉伸电子显示器和智能可穿戴纺织品的开发与研制方面都具有良好的应用价值。

In order to develop a highly elastic and bistable electrochromic material for flexible electronic display devices,poly(2-hydroxyethyl acrylate)(PHEA)ionic gel based on hydrogen bond cross-linking network structure was prepared by solution polymerization.The hydrogen bond between the fluorane dye lactone ring and the polymer hydroxyl unit gave the fluorane dye color steadiness.The mechanical properties of PHEA ionic gel were tested by tensile testing machine.The transparency,electrochromic performance and bistable performance of the ionic gel device were characterized by potentiostat and spectrophotometer.The results show that PHEA ionic gel has tensile strength of 537 kPa and tensile resilience of 436%.The resulting electrochromic device is found to have responsiveness of 16.5 s,high coloration contrast of>80%,bistability of 45 h,and reversibility of>1000 cycles,all of which are regarded as excellent.The ionic gel offers good application value in the development of stretchable electrochromic display and intelligent wearable electronic textiles.