The Role of Tie Chains on the Mechano‐Electrical Properties of Semiconducting Polymer Films
The Role of Tie Chains on the Mechano‐Electrical Properties of Semiconducting Polymer Films
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DOI：
10.1002/aelm.201901070
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发表时间：
2020-02
影响因子：
6.2
通讯作者：
Kaichen Gu;J. Onorato;C. Luscombe;Y. Loo
中科院分区：
文献类型：
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作者：
Kaichen Gu;J. Onorato;C. Luscombe;Y. Loo
研究了聚(3-己基噻吩基)薄膜的力-电性能与其链段含量的关系。在应变诱导的结构取向和应变方向的电荷输运增强方面，结合链起着不可或缺的作用。在缺乏足够的结合链的情况下，外部机械力不能引起任何显著的聚合物主干局部排列或在介观尺度上的微晶重新取向。相反，这些样品在变形时会发生脆性断裂，裂缝垂直于应变方向形成，因此阻碍了该方向的电荷传输。这种对应变对齐的机械洞察力表明，利用结链分数作为实用的调谐旋钮来影响共轭聚合物系统的机械力-电学性质是有希望的。
The mechano‐electrical properties of poly(3‐hexylthiophene) thin films are investigated as a function of their tie‐chain content. Tie chains play an indispensable role in enabling strain‐induced structural alignment and charge‐transport enhancement in the strain direction. In the absence of sufficient tie chains, the external mechanical force cannot induce any significant polymer backbone alignment locally or crystallite reorientation at the mesoscale. These samples instead undergo brittle fracture on deformation, with cracks forming normal to the direction of strain; charge transport in this direction is hindered as a consequence. This mechanistic insight on strain alignment points to the promise of leveraging tie‐chain fraction as a practical tuning knob for effecting the mechano‐electrical properties in conjugated polymer systems.