CONFORMATIONAL-CHANGES OF POLY(3-ALKYLTHIOPHENE)S WITH TEMPERATURE AND PRESSURE
CONFORMATIONAL-CHANGES OF POLY(3-ALKYLTHIOPHENE)S WITH TEMPERATURE AND PRESSURE
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DOI：
10.1016/0379-6779(94)90256-9
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发表时间：
1994-03-31
期刊：
影响因子：
4.4
通讯作者：
MATSUZAKI, S
中科院分区：
文献类型：
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作者：
IWASAKI, K;FUJIMOTO, H;MATSUZAKI, S
通过电子吸收和红外光谱研究了聚(3-己基噻吩)和聚(3-十二烷基噻吩)流延膜的热致变色现象。从 FT-IR 光谱推导出的亚甲基侧链构象变化的角度讨论了转变的可能机制。使用金刚石砧池在高压下测量聚（3-己基噻吩）薄膜的电子吸收和振动光谱。吸收边能量随着压力增加至 3 GPa 而下降，然后趋于平稳并随后增加。这种减少可能是由于亚甲基侧链的紧密堆积导致噻吩主链的共轭长度增加。另一方面，边缘能量的增加归因于相邻聚合物链之间的空间位阻引起的平面聚合物结构的扭曲。聚（3-己基噻吩）薄膜的电导率表现出与吸收边平行的压力依赖性。
Thermochromism of cast films of poly(3-hexylthiophene) and poly(3-dodecylthiophene) was studied by electronic absorption and FT-IR spectra. A possible mechanism for the transition is discussed from the viewpoint of conformational changes of the methylene side chains deduced from the FT-IR spectra. Electronic absorption and vibrational spectra of poly(3-hexylthiophene) films were measured at high pressures by use of a diamond anvil cell. The absorption edge energy decreased with increasing pressure up to 3 GPa and then showed leveling off and subsequent increase. The decrease is probably due to an increased conjugation length of the thiophene main chain caused by a compact packing of methylene side chains. On the other hand, the increase in the edge energy is attributed to a distortion of a plane polymer structure caused by the steric hindrance between neighboring polymer chains. Electric conductivity of a poly(3-hexylthiophene) film showed the pressure dependence parallel to that of the absorption edge.