Abstract The structure evolution of poly(3-dodecylthiophene) (P3DDT) during heating was investigated by differential scanning calorimetry (DSC) and in-situ wide and small-angle X-ray scattering (WAXS/SAXS). Four regions were classified in the heating process, i.e. below the melting temperature of the side chain (I), side-chain melting region (II), below main chain melting region (III) and the melting of the main chain region (IV). Melting of side chains in region II introduced an expansion of the (1 0 0) plane spacing, resulting in a lower crystalline phase density and therefore a lower crystalline/amorphous density contrast. The reorganization process during heating was observed. The double melting peaks during heating were shown to result from melting and recrystallization. No evidence of liquid crystalline phase or mesophase was observed above the melting temperature of P3DDT.

中文翻译：

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区域规整聚（3-十二烷基噻吩）双熔峰的性质

摘要 通过差示扫描量热法 (DSC) 和原位广角和小角 X 射线散射 (WAXS/SAXS) 研究了聚（3-十二烷基噻吩）（P3DDT）在加热过程中的结构演变。加热过程分为四个区域，即低于侧链熔化温度（I）、侧链熔化区（II）、低于主链熔化区（III）和熔化主链区（IV） . 区域 II 中侧链的熔化引入了 (1 0 0) 平面间距的扩展，导致较低的结晶相密度，从而导致较低的结晶/非晶密度对比度。观察到加热过程中的重组过程。加热过程中的双熔融峰是由熔融和重结晶引起的。