Abstract A new magenta-to-transmissive electrochromic polymer, poly(3,4-bis(3-bromopropoxy)thiophene) (PBBrPOT) was synthesized by electrochemical polymerization and its electrochromic properties were characterized in detail. Compared with the representative “large-volume alkyl substituents” strategy, herein we use bromines as the end-capping groups of two propoxyl substituents on the 3- and 4- position of the thiophene ring to introduce more steric repulsion within the polymer chains, and therefore obtain a magenta neutral state of the polymer. The PBBrPOT film shows a set of reasonable electrochromic features, including low driving potentials (−0.1 V and 0.9 V), appropriate transmittance change (38% at 556 nm), but a relatively longer response time in bleaching process (t95 = 6.5 s).

中文翻译：

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基于 3, 4-二氧噻吩的洋红色至透射电致变色聚合物的合成和光电化学性能

摘要 采用电化学聚合方法合成了一种新的洋红色至透射电致变色聚合物聚(3,4-双(3-溴丙氧基)噻吩) (PBBrPOT)，并对其电致变色性能进行了详细表征。与代表性的“大体积烷基取代基”策略相比，本文使用溴作为噻吩环 3- 和 4- 位上两个丙氧基取代基的封端基团，以在聚合物链内引入更多的空间排斥，并且因此获得聚合物的品红色中性状态。PBBrPOT 薄膜显示出一组合理的电致变色特性，包括低驱动电位（-0.1 V 和 0.9 V）、适当的透射率变化（556 nm 处为 38%），但漂白过程中的响应时间相对较长（t95 = 6.5 s） .