吲哚类导电聚合物的电化学合成及其电致变色性能研究
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摘要
高性能吲哚类导电聚合物的制备和电致变色性能研究是目前研究的热点。电化学方法是制备导电聚合物的一种重要方法。本论文主要研究了三种吲哚衍生物在中性溶剂中的电化学聚合,分别制备了聚(5-醛基吲哚)、聚(6-羧基吲哚)和5-氰基吲哚和3,4二氧乙撑噻吩的共聚物,并对相应聚合物的电致变色性能及其在电致变色器件中的应用进行了研究。
     1.通过直接电化学氧化5-醛基吲哚(5FIn)单体合成了一种新型的可溶性的聚吲哚衍生物—聚(5-醛基吲哚)(P5FIn)。由于醛基的引入,制备的聚合物膜具有良好的电化学活性和热稳定性,电导率为2.43×10~(-2) Scm~(-1)。光谱电化学研究表明,聚(5-醛基吲哚)具有良好的电致变色性能,透过率高,响应时间短。基于聚(5-醛基吲哚)和聚(3,4-二氧乙撑噻吩)研制的电致变色器件能够在绿色和深蓝色之间进行颜色转化,且具有快速的响应时间、高对比度和良好的开路记忆效应。
     2.通过直接电化学氧化6-羧基吲哚(I6CA)单体合成了一种具有纳米结构的聚吲哚衍生物—聚(6-羧基吲哚)(PI6CA)。制备的聚合物膜具有良好的电化学活性和热稳定性,电导率为0.28Scm~(-1)。光谱电化学研究表明,聚合物膜具有良好的电致变色性能。组装了基于聚(6-羧基吲哚)和聚(3,4-二氧乙撑噻吩)的电致变色器件,并研究了相应的电致变色性能。研究表明,该器件能够在绿色和蓝色之间进行颜色转化,且具有快速的响应时间、高对比度和良好的开路记忆效应。
     3.研究了5-氰基吲哚(CNIn)和3,4-二氧乙撑噻吩(EDOT)的电化学共聚。研究表明,该共聚物薄膜具有良好的电化学活性和稳定性。光谱电化学分析表明5-氰基吲哚和3,4-二氧乙撑噻吩的共聚物薄膜能在棕色和蓝色之间转化。此外,基于共聚物构建了相应的电致变色器件,研究表明,该器件能够在深棕色和深蓝色之间进行颜色转化,且具有快速的响应时间、高对比度和良好的开路记忆效应。
The preparation of high-performance conductive polyindole and the study of itselectrochromic properties has been the current research focus. Electrochemicalpolymerization has been proved to be one of the most useful approaches forconducting polymer synthesis. In this dissertation, poly(indole-6-carboxylic acid)(PI6CA), Copolymer of 5-cyanoindole (CNIn) with 3,4-ethylene dioxythiophene(EDOT), poly(5-formylindole) (P5FIn) were successfully prepared by electrochemicalpolymerization in acetonitrile (ACN). The electrochromic properties of thesehigh-qualitycorrespondingpolymers werealsoinvestigated.
     1. The electrosyntheses of a novel high-quality polyindole derivative,poly(5-formylindole) (P5FIn) in acetonitrile are reported. It is interesting that P5FInfilm with high fluorescence quantum yields and photochemical stabilityfor the importof aldehyde group. The conductivities of the film is tested to be 2.43×10~(-2) S cm~(-1).Spectroelectrochemical studies manifest that P5FIn with high transmissivityand shortswitch time. Furthermore, a dual type electrochromic device (ECD) based on P5FInand poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed and itselectrochromic properties were investigated. The ECD exhibits color changed fromgreen (neutral) to dark blue (oxidized) with a good open circuit memory and robustcyclelife.
     2. Poly(indole-6-carboxylic acid) (PI6CA) film, a novel soluble nanostructuredpolyindole derivative, was synthesized electrochemically by direct oxidation ofindole-6-carboxylic acid (I6CA) in acetonitrile + 0.1 mol L~(-1) TBATFB. The resultingpolymer were performed good electrochemical stability and thermostability. The conductivities of the sample is tested to be 0.28 S cm~(-1). Furthermore, thespectroelectrochemical and electrochromic properties of the polymer films wereinvestigatedwithUV–visspectroscopy .Inaddition,adualtypeelectrochromicdevicebased on PI6CA and PEDOT was constructed and its spectroelectrochemicalproperties were investigated. The electrochromic device exhibits color change fromgreen to dark bluein a short switching time and visible constract together with a goodopencircuitmemory.
     3.Copolymer of 5-cyanoindole(CNIn) with 3,4-ethylene dioxythiophene (EDOT)was electrochemically synthesized and characterized. Resulting copolymer film hasgood electrochemical stability and thermostability.In addition, the copolymer showdistinct electrochromic properties, could change bewteen brown and blue.And itsapplication in electrochromic devices (ECDs) are discussed. The electrochromicdevice exhibits color change from green to dark blue in a short switching time andvisibleconstracttogetherwithagoodopencircuitmemory.
引文
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