A Phenomenological Model for Predicting Thermochromism of Regioregular and Nonregioregular Poly(3-alkylthiophenes)
A Phenomenological Model for Predicting Thermochromism of Regioregular and Nonregioregular Poly(3-alkylthiophenes)
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DOI：
10.1021/ma9604799
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发表时间：
1996-09
期刊：
影响因子：
5.5
通讯作者：
Cheng Yang;F. Orfino;S. Holdcroft
中科院分区：
文献类型：
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作者：
Cheng Yang;F. Orfino;S. Holdcroft
研究了具有不同头-尾（HT）二联体含量（70−100%）的聚（3-烷基噻吩）（P3 AT，A =己基、辛基、十二烷基和十六烷基）的一系列流延膜的热致变色性。发现其热致变色行为受HT二联体含量和侧链长度的控制。具有中等HT二联体含量的P3 AT产生清楚的热致变色等吸光点，而与烷基侧链的长度无关。HT二联体含量>90%的区域规则聚合物表现出连续的热致变色蓝移或等吸光点，这取决于烷基侧链长度。不同的热致变色特性归因于聚合物之间的细微形态差异。DSC和X射线衍射研究表明，具有中等HT规则性的P3 AT样品是形式上非晶态的，准有序相分散在连续的无序畴中。具有高HT规则性的P3 AT由结晶相、准有序相和无序相组成。对于短链聚合物，
Thermochromism of a series of cast films of poly(3-alkylthiophenes) (P3ATs, A = hexyl, octyl, dodecyl, and hexadecyl) with different head-to-tail (HT) diad content (70−100%) was studied. The thermochromic behavior is found to be controlled by the HT diad content and the side chain length. P3ATs with moderate HT diad content give rise to a clear thermochromic isosbestic point irrespective of the length of the alkyl side chain. Regioregular polymers possessing a >90% HT diad content exhibit either a continuous thermochromic blue shift or an isosbestic point, depending on the alkyl side chain length. The different thermochromic characteristics are attributed to subtle morphological differences between the polymers. DSC and X-ray diffraction studies indicate that P3AT samples with moderate HT regularity are formally amorphous with a quasi-ordered phase dispersed in continuous disordered domains. P3ATs with high HT regularity consist of crystalline, quasi-ordered, and disordered phases. For polymers with short...