Aggregation of conjugated polymers in aromatic solvent.
Aggregation of conjugated polymers in aromatic solvent.
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DOI：
10.1021/la802526d
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
M. H. Rahman;Shao-Ching Liao;Hsin‐Lung Chen;Jean-Hong Chen;Viktor Ivanov;P. P. Chu-P.;S. Chen
中科院分区：
文献类型：
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作者：
M. H. Rahman;Shao-Ching Liao;Hsin‐Lung Chen;Jean-Hong Chen;Viktor Ivanov;P. P. Chu-P.;S. Chen
共轭聚合物的链段显示出在含有常见有机溶剂的溶液中聚集的倾向。在这里，我们揭示了共轭聚合物聚(9，9-二(2-乙基己基)荧烯-2，7-二基)(PF2/6)在甲苯中的链段聚集是通过溶剂分子和聚合物链段的pi-pi堆积诱导形成的聚合物-溶剂络合物来稳定的。在这种情况下，当体系降至亚环境温度时，一部分溶剂被困在聚合域中。这些相关的溶剂分子的停留时间变得足够长，以产生单独的前场移位的核磁共振共振。这种共振的线形显示了聚集体中聚合物链段的排列。由于形成了较强的聚合物-溶剂络合物，部分溶剂冻结在致密结构中。
Segments of conjugated polymers display the propensity to aggregate in solutions with common organic solvents. Here we revealed that the segmental aggregation of a conjugated polymer, poly(9,9-bis(2-ethylhexyl)fluorene-2,7-diyl), (PF2/6), in toluene was stabilized by the polymer-solvent complex formation through pi-pi stacking induction of solvent molecules and polymer segments. In this case, a portion of the solvent was trapped inside the aggregate domains upon bringing the system to the subambient temperatures. The residence time of these associated solvent molecules became long enough to yield a separate upfield-shifted NMR resonance. The line-shape of this resonance revealed alignment of the polymer segments in the aggregates. A portion of the solvent was frozen in the compact structure due to the formation of strong polymer-solvent complex.