摘要/Abstract

近年来，基于给体-受体（D-A）型共轭聚合物的电致变色器件表现出响应速率快、颜色可调、良好的循环稳定性等诸多优点，受到广泛关注.设计了一类以三苯胺为电子给体，喹喔啉衍生物为电子受体的新型给体-受体-给体（D-A-D）型化合物5，8-二（4-（二苯基氨基）苯基）-2，3-二甲基喹喔啉（Q1）和6，9-二（4-（二苯基氨基）苯基）-1，2，3，4-四氢吩嗪（Q2），通过电化学聚合制备了D-A型聚合物聚（5，8-二（4-（二苯基氨基）苯基）-2，3-二甲基喹喔啉）（PQ1）和聚（6，9-二（4-（二苯基氨基）苯基）-1，2，3，4-四氢吩嗪）（PQ2）.研究表明，该类新型的D-A型聚合物在中性时为浅黄色，且随着电压的增大呈现多种颜色变化.该类电致变色材料具有响应时间快、着色效率较高、循环稳定性良好等优点，且其在780 nm附近的最大光学对比度均超过70%，具有潜在的应用价值.
关键词: 给体-受体(D-A)型, 三苯胺, 喹喔啉, 电化学聚合, 电致变色
Recently, electrochromic devices based on donor-acceptor (D-A) type conjugated polymers have received great attention, owing to their fast response rate, tunable color, good cycle stability, and so on. Two novel donor-acceptor-donor (D-A-D) type monomers N-(4-(5-(4-(diphenylamino)phenyl)-2,3-dimethylquinoxalin-8-yl)phenyl)-N-phenylbenzenamine (Q1) and N-(4-(6-(4-(diphenylamino)phenyl)-1,2,3,4-tetrahydrophenazin-9-yl)phenyl)-N-phenylbenzenamine (Q2) using triphenylamine as electron donor and quinoxaline-based moiety as electron acceptors were designed, which were further electrochemical polymerized to prepare D-A type electrochromic polymers poly(N-(4-(5-(4-(diphenylamino)phenyl)-2,3-dimethyl-quinoxalin-8-yl)phenyl)-N-phenylbenzenamine) (PQ1) and poly(N-(4-(6-(4-(diphenylamino)phenyl)-1,2,3,4-tetrahydrophe-nazin-9-yl)phenyl)-N-phenylbenzenamine) (PQ2), respectively. The as-prepared D-A type polymers exhibited pale yellow in the neutral state, and multicolor change with the increase of the applied potentials. These novel electrochromic materials showed fast switch rate, good cycle stability as well as good coloration efficiency. Moreover, the highest contrast ratio of both exceeded 70% around 780 nm, which guaranteed their potential practical applications.
Key words: donor-acceptor (D-A) type, triphenylamine, quinoxaline, electrochemical polymerization, electrochromic


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