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.

中文翻译：

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领带链对半导体聚合物薄膜的机电性能的作用

研究了聚（3-己基噻吩）薄膜的机电性能随其键链含量的变化。系链在实现应变诱导的结构对齐和增强应变方向上的电荷传输方面起着不可或缺的作用。在没有足够的键链的情况下，外部机械力不能在中尺度上引起任何明显的聚合物骨架局部排列或微晶重新取向。相反，这些样品在变形时会发生脆性断裂，并形成与应变方向垂直的裂纹。结果，阻碍了沿该方向的电荷传输。对应变对准的这种机械洞察力表明了利用绑链分数作为影响共轭聚合物系统中机电性能的实用调节旋钮的希望。