Effects of linear and branched side chains on the redox and optoelectronic properties of 3,4-dialkoxythiophene polymers,Polymer Chemistry

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Effects of linear and branched side chains on the redox and optoelectronic properties of 3,4-dialkoxythiophene polymers
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020/02/21 , DOI: 10.1039/c9py01720h
Melony A. Ochieng _{1,

2,

3,

4,

5} , James F. Ponder _{1,

2,

3,

4,

5} , John R. Reynolds _{1,

2,

3,

4,

5}

Affiliation

Identification of relevant structure–property relationships on solution-processable conjugated polymers have been shown to improve the performance of various redox active devices. While most research efforts have focused on the conjugated backbone, less focus has been given to the relative impact of side chain structure. Here, we report a side chain variation study tuning the optoelectronic properties on a series of 3,4-dioxythiophene-based polymers with a common conjugated backbone and differing alkyl side chains. Using a range of analysis methods, it was determined that changing from linear to branched alkyl side chains affects ionization potential, optical bandgap, perceived color, electrochromic contrast, switching speed, and switching stability. Specifically, the polymers with branched side chains have higher onsets of oxidation and optical bandgaps, and demonstrate sudden coloration change compared to polymers bearing linear side chains. This work provides a foundation for establishing structure–property relationships on the effects of alkyl side chains on the next generation of electrochromic conjugated polymers.

中文翻译：

直链和支链侧链对3,4-二烷氧基噻吩聚合物的氧化还原和光电性能的影响

在溶液可加工的共轭聚合物上鉴定相关的结构-性质关系已被证明可以改善各种氧化还原活性器件的性能。尽管大多数研究工作都集中在共轭骨架上，但侧链结构的相对影响却很少。在这里，我们报告了一个侧链变异研究，该研究对具有共同共轭骨架和不同烷基侧链的一系列3,4-二氧噻吩基聚合物的光电性能进行了调整。使用一系列分析方法，确定了从直链烷基支链变为支链烷基侧链会影响电离电势，光学带隙，感知的颜色，电致变色对比度，转换速度和转换稳定性。特别，与带有线性侧链的聚合物相比，具有支链侧链的聚合物具有更高的氧化和光学带隙发作，并表现出突然的颜色变化。这项工作为建立关于烷基侧链对下一代电致变色共轭聚合物的影响的结构-性质关系提供了基础。

更新日期：2020-03-24

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