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Influence of Alkyl Chain Spacer Length on the Charge Carrier Mobility of Isotactic Poly(N-carbazolylalkyl acrylates)

机译：烷基链间隔物长度对全同立构多（N-咔唑烷基丙烯酸酯）电荷载流子迁移率的影响

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摘要

In the search for semiconducting polymer alternatives to conjugated polymers, stereoregular nonconjugated pendant electroactive polymers (NCPEPs) have recently shown competitive hole mobilities with conjugated polymers and a dramatic increase in mobility relative to atactic analogues. Here we investigate one of the key structural variables of NCPEPs: the flexible alkyl spacer that separates the electroactive pendant from the backbone. We investigate a straightforward postpolymerization fiinctionalization synthetic method to synthesize such polymers with high isotacticity using poly(N-carbazolylalkyl acrylate) as a model system, where the alkyl chain spacer in the NCPEPs is varied from 2 to 12 carbons. We observed that the hole mobility increased from the two-carbon spacer, resulting in the highest mobility upon thermal annealing with a four-carbon spacer for 75% isotactic polymers and with a six-carbon spacer for 87% isotactic polymers. As such, we have demonstrated an important role of the spacer chain in influencing mobility. For all spacer lengths, higher mobilities were measured with the more isotactic polymer. While physical characterization of the largely amorphous polymers yielded little insight into the structure-function relationships, DFT and MD simulations indicated helical structures for the polymers where intermolecular short-range z-stacking is observed and is affected by spacer chain length. This work demonstrates that both the degree of stereoregularity and the spacer chain length play a role in determining the hole mobility in NCPEPs.
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  • 来源
    《ACS Macro Letters》 |2021年第6期|共7页
  • 作者

    Samal Sanket; Thompson Barry C.;

  • 作者单位

    Univ Southern Calif Dept Chem Loker Hydrocarbon Res Inst Los Angeles CA 90089 USA;

    Univ Southern Calif Dept Chem Loker Hydrocarbon Res Inst Los Angeles CA 90089 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
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