采用简单的旋涂、喷涂等方法,制备了一种由可溶性聚苯胺为主体电致变色智能热控器件.该器件的基底为聚酯,固体电解质为锂盐/聚丙烯腈.通过电切换调控,该器件发射率能够在0.46-0.75内调控,且红外光谱反射率变化大于38%.研究了厚度、预掺杂酸种类、浓度等对聚苯胺活性层发射特性的影响;考察了导电高分子聚苯胺层厚度、电切换电压等因素对涂层体系发射率调控的影响.结果表明发射率的调控范围与电化学还原的深度密切相关,通过调节材料厚度、掺杂酸种类等可有效提高发射率调控范围.该导电高分子电致变色智能热控涂层在航天器热控制方面展示了良好的应用前景.
In order to develop a smart variable emittance thermal control coating, we here report on a flexible solid-state electrochromic device(ECD) based on soluble polyaniline by simple fabrication process. Devices were as- sembled in sandwich configuration of electrochromic materials on flexible PET substrate and a Li~ doped polyacryloni- trile as a solid polymer electrolyte. The initial surface emissivity characteristics related to oxidation states, doping con- centration, doping agent and thickness were discussed. The smart thermal management of this ECD was characterized by its emittance in view of the thickness of active layer and the applied voltage. The emittance of our ECD can be tuned from 0.46 to 0.75 without any fine optimization, which is similar to that of other solid-state ECDs. The major advantage of this work is that the electrochromic variable emittance coating can be preparedby using simple process, such as spin coating and spray coatings. These methods do not require any special equipments and vacuum working conditions, and are easily applied for large area process as well. This study may open new avenues in the development of flexible electrochromic devices for spacecraft thermal control.
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