半导体polymer中π共轭和构象的小角X射线散射研究
pi-Conjugation and conformation in a semiconducting polymer: small angle x-ray scattering study
摘要：
小角X射线散射（SAXS）研究了聚[2-甲氧基-5-（2-乙基己氧基）-1，4-亚苯基亚乙烯基]（MEH-PPV）溶液中π电子共轭对控制链构象和组装的重要作用。通过将共轭程度从30%增加到100%，持续长度（l_p）从20增加到66埃。此外，在完全共轭链中，在较大的长度尺度上观察到对分布函数中的明显的第二峰。这一特征表明，随着沿链的共轭增加，链段倾向于自组装。二甲苯增强了PPV主链的刚性，形成伸展结构，而四氢呋喃溶剂化侧基，形成紧凑的螺旋，其中l_p更短。
英文摘要：
Small angle X-ray scattering (SAXS) in poly[2-methoxy-5-(2-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) solution has shown the important role of pi-electron conjugation in controlling the chain conformation and assembly. By increasing the extent of conjugation from 30 to 100 %, the persistence length (l_p) increases from 20 to 66 Angstrom. Moreover, a pronounced second peak in the pair distribution function has been observed in fully conjugated chain, at larger length scales. This feature indicates that the chain segments tend to self-assemble as the conjugation along the chain increases. Xylene enhances the rigidity of PPV backbone to yield extended structures, while tetrahydrofuran solvates the side groups to form compact coils in which the l_p is much shorter.
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