单体摩尔比对共聚物电化学及电致变色性质的影响

通过电化学聚合法制备了3, 6-(二噻吩基)-9-(二茂铁甲酸己酯基)-咔唑(BTC-H-Fc)与3, 4-乙烯二氧噻吩(EDOT)不同摩尔比下的共聚物,并运用电化学、傅里叶变换红外(FT-IR)光谱及光谱电化学对其结构与性能进行了表征。研究结果表明所得共聚物均能显示良好的电化学特性,光谱电化学测试结果表明,当摩尔浓度比为1时, P(BTC-H-Fc:EDOT)-1中性态下表现浅绿色,且随着施加电压增加转变为绿色和紫色; P(BTC-H-Fc:EDOT)-4则显示了最丰富的颜色,可在中性态的红褐色、棕黄色、绿色、蓝色和紫色五种颜色之间可逆变换;当摩尔比继续增加时, P(BTC-H-Fc:EDOT)-8可以显示红褐色、灰黑色、蓝绿色和天空蓝四种颜色。另外,三种摩尔比的聚合物薄膜还具有不错的光学对比度,转换响应时间及着色效率,该性能为其在电致变色器件的应用提供了潜力。

Effects of Monomer Molar Ratio on the Electrochemical and Electrochromic Properties of Copolymers

Copolymers were prepared by electropolymerization using different feed ratios of 6-(3, 6-di(thiophen-2-yl)-9H-carbazol-9-yl)hexyl ferrocenecarboxylate (BTC-H-Fc) and 3, 4-ethoxylenedioxythiophene (EDOT). The structure and performance of copolymers were characterized by electrochemical measurements, Fourier transform infrared (FT-IR) spectroscopy, and spectroelectrochemistry. The results showed that all the copolymers could exhibit desirable electrochemical features. Spectroelectrochemical studies indicated that P(BTC-H-Fc: EDOT)-1 was light green at the neutral state, and changed to green and then purple with increasing applied potential. P(BTC-H-Fc:EDOT)-4 possessed outstanding color-changing ability; its colors included chocolate brown, yellow brown, green, blue, and purple. P(BTC-H-Fc:EDOT)-8 could be chocolate brown, gray black, blue green, and sky blue. All the copolymer films possessed favorable optical contrast, switching time, and coloration efficiency, laying the foundation for their potential applications in electrochromic device.