含氟高分子涂料的合成及电润湿性能研究进展

Synthesis and Electrowetting Properties of Fluorine-containing Polymer Coating:a Review

含氟高分子涂料具有优异的物化特性,被广泛应用于微电子、电子信息显示和各种光学器件等产业领域。特别的是,含氟高分子膜具有不黏附性、耐化学腐蚀性、极强的稳定性等性能,这些特性使其可用作疏水层并应用在新一代电润湿电子纸显示领域。电润湿作用是通过改变液滴与含氟疏水层之间电压来改变液滴在基板上的润湿性,使液滴发生形变、位移,是一种新的显示驱动机制。电润湿显示器件的性能和寿命与含氟高分子涂层介电性能直接相关。含氟高分子溶液或涂层存在溶剂选择范围小、玻璃化转化温度高、介电常数低、容易击穿等限制,这阻碍了电润湿显示器件的发展。这些在此之前还未见评价和综述。鉴于未来电子材料将向多品种、高质量发展,含氟高分子是能满足这一要求的功能材料,让研究者充分了解含氟高分子涂料的特征、合成、介电润湿性能,以及电润湿显示器件对相关材料的性能的要求,显得尤其重要。本文详细论述了近年来含氟高分子疏水材料的结构特点、性能及合成方法,综述了当前含氟高分子电润湿显示的研究进展,详细探讨了含氟高分子膜的关键物化性质包括介电常数、击穿电压、漏电流、润湿性能等及其对介电润湿性能的影响机制,总结了含氟聚合物材料的应用瓶颈和含氟聚合物涂料在电润湿显示器件上的应用现状,对含氟高分子今后的研究方向做了简单的展望。

Fluorinated polymer coatings have excellent physical properties and are widely used in the fields of microelectronics,electronic information dis-play and various opticaldevices. In particular,fluorinated polymer films bear properties such as non-adhesiveness,highly chemical resistance,high stability,etc.,which make it highly applicable as a hydrophobic layer material in electrowetting displays( EWD). The electrowetting( EW) is a new display driving mechanism by applying a direct voltage between a droplet and the fluorinated polymer based hydrophobic layer so that the droplet can be deformed and displaced.The properties and lifetime of the EWD device is directly related to the dielectric properties of the fluorinated polymer layer. The fluorinated polymer solution or coating is limited by narrow solvent selection range,high glass conversion temperature,low dielectric constant and easy breakdown,which hinders the development of EWD devices. To our knowledge,these have not been evaluated and reviewed. Given that electronic materials are moving towards multi-variety and high-quality development,and fluorinated polymeric material is a functional material to meet these requirements,it appears particularly important to let researchers fully understand the characteristics,synthesis methods and dielectric wetting performance of fluorinated polymer coatings,as well as the performance requirements of EWD devices upon relevant materials.This paper discusses the structural characteristics,performance and synthesis methods of fluorinated polymer hydrophobic materials,reviews the research progress of fluorinated polymer EWD in recent years,elaborates the key physicochemical properties of fluorinated polymer films,including dielectric constants,breakdown voltage,leakage current,wetting performance and their impacts on EW properties,summarizes the bottlenecks of fluorinated polymers and the application status of its coating on EWD devices,and prospects briefly its future research direction.