Zhang Yan, Liu Xuezhong, Wang Min, Liu Xiaoli, Zhao Jinsheng
Shandong Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Liaocheng University, Liaocheng 252059, China.
Gastrointestinal Surgery, Liaocheng People's Hospital, Liaocheng 252000, China.
Polymers (Basel). 2016 Oct 24;8(10):377. doi: 10.3390/polym8100377.
Four donor⁻acceptor type conducting polymers, namely poly(2,3-bis(4-decyloxy)phenyl)-5,8-bis(4-thiophen-2-yl)pyrido[4,3-b]pyrazine) (P1), poly(2,3-bis(4-decyloxy)phenyl)-5,8-bis(4-butylthiophen-2-yl)pyrido[4,3-b]pyrazine) (P2), poly(2,3-bis(4-(decyloxy)phenyl)-5,8-bis(4-hexyloxythiophen-2-yl)pyrido[4,3-b]pyrazine) (P3) and poly(2,3-bis(4-(decyloxy)phenyl)-5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-7-yl)pyrido[4,3-b]pyrazine) (P4), containing thiophene or its derivative as the donor and pyrido[4,3-b]pyrazine as the acceptor were prepared and characterized by cyclic voltammetry, scanning electron microscopy, and UV-Vis spectroscopy to detect the influence of the donor units' strength on the electrochromic performances. The results demonstrated that all of the polymers could be reversibly reduced and oxidized by p-type doping and n-type doping, and showed near-infrared activities and different color changes in p-type doping process. Especially, P3 and P4 showed lower optical band gap than P1 and P2 due to the strong electron-donating hexyloxythiophen group of P3 and ethylenedioxythiophene group of P4. Besides, P3 and P4 displayed the saturated green color at the neutral state and the desirable transparency at the oxidized state. All the polymers displayed desirable optical contrasts, satisfactory coloration efficiency, excellent stability and short switching time, which made the polymers fascinating candidates in the electrochromic device applications.
制备了四种供体-受体型导电聚合物，即聚(2,3-双(4-癸氧基)苯基)-5,8-双(4-噻吩-2-基)吡啶并[4,3-b]吡嗪)(P1)、聚(2,3-双(4-癸氧基)苯基)-5,8-双(4-丁基噻吩-2-基)吡啶并[4,3-b]吡嗪)(P2)、聚(2,3-双(4-(癸氧基)苯基)-5,8-双(4-己氧基噻吩-2-基)吡啶并[4,3-b]吡嗪)(P3)和聚(2,3-双(4-(癸氧基)苯基)-5,8-双(2,3-二氢噻吩并[3,4-b][1,4]二氧杂环庚-7-基)吡啶并[4,3-b]吡嗪)(P4)，它们以噻吩或其衍生物为供体，吡啶并[4,3-b]吡嗪为受体，并通过循环伏安法、扫描电子显微镜和紫外-可见光谱进行表征，以检测供体单元强度对电致变色性能的影响。结果表明，所有聚合物都可以通过p型掺杂和n型掺杂进行可逆的还原和氧化，并在p型掺杂过程中表现出近红外活性和不同的颜色变化。特别是，由于P3的强给电子己氧基噻吩基团和P4的乙撑二氧噻吩基团，P3和P4的光学带隙比P1和P2低。此外，P3和P4在中性状态下呈现饱和绿色，在氧化状态下具有理想的透明度。所有聚合物都表现出理想的光学对比度、令人满意的着色效率、优异的稳定性和较短的切换时间，这使得这些聚合物成为电致变色器件应用中极具吸引力的候选材料。
