Preparation of a Star Network PEG-based Gel Polymer Electrolyte and Its Application to Electrochromic Devices

A star network polymer with a pentaerythritol core linking four PEG-block polymeric arms was synthesized, and its corresponding gel polymer electrolyte based on lithium perchlorate and plasticizers EC/PC with the character being colorless and highly transparent has been also prepared. The polymer host was characterized and confirmed to be of a star network and an amorphous structure by FTIR, ^1H NMR and XRD studies. The polymer host hold good mechanical properties for pentaerythritol cross-linking. Maximum ionic conductivity of the prepared polymer electrolyte has reached 8.83 × 10 ^-4 S·cm^-1 at room temperature. Thermogravimetry （TG） of the polymer electrolyte showed that the thermal stability was up to at least 150 ℃. The gel polymer electrolyte was further evaluated in electrochromic devices fabricated by transparent PET-ITO and electrochromically active viologen derivative films, and its excellent performance promised the usage of the gel polymer electrolyte as ionic conductor material in electrochrornic devices.     

P(VAc-MA)/PMMA为基体的聚合物电解质制备及其在电致变色器件中的应用

以醋酸乙烯酯(VAc)和丙烯酸甲酯(MA)为单体, 采用半连续种子乳液聚合法制备了无规共聚物P(VAc-MA), 以PMMA与P(VAc-MA)的共混物为基体制备了聚合物电解质. 用红外光谱(FTIR)、X射线衍射(XRD)、热重分析(TG)、紫外光谱(UV)、力学性能测试及电化学交流阻抗等方法研究了聚合物、聚合物膜和聚合物电解质的性质. 结果表明, VAc与MA通过打开各自的CC键聚合生成P(VAc-MA); P(VAc-MA)与PMMA共混后结晶状态发生了变化, 增加了无定形相区, 降低了链段运动的能量壁垒, 提高了热稳定性和拉伸强度. 以P(VAc-MA)/PMMA为基体的聚合物电解质膜具有很高的透明性, 最大室温电导率达到1.17×10-3 S/cm; 离子电导率随着温度的升高而迅速增加, 电导率-温度曲线符合Arrhenius方程; 将此电解质用于全固态电致变色显示器件显示出优良的性能.     

烯烃取代的紫罗精合成及全固态电致变色器件

合成了2种烯烃取代的紫罗精分子,通过核磁、红外和紫外测试技术对其结构进行了确证。循环伏安表明,它们都有2个明显的可逆氧化还原峰;并以PEO胶体聚电解质为离子导电层组装出了基于所合成化合物,低能耗、无辐射的全固态电致变色器件,总厚度约2.35mm,同溶液型电致变色器件相比较,全固态化可以提高器件在变色-褪色和开路延时记忆等方面的性能,且固态电致变色器件制作工艺相对简单,便于规模化生产。经优化后制作的电致变色器件施加1.1～3V的电压可产生明显的蓝色或紫色,断电后开路延时记忆可以达到3d。实验测试出大多数器件响应时间小于50ms,循环次数在百万次以上,主要性能指标已经达到电子墨水的显示要求。