Aggregation of conjugated polymers in aromatic solvent

M. Habibur Rahman, Shao Ching Liao, Hsin Lung Chen, Jean Hong Chen, Viktor A. Ivanov, Peter P.J. Chu, Show An Chen

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


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 π-π 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.

Original languageEnglish
Pages (from-to)1667-1674
Number of pages8
Issue number3
StatePublished - 3 Feb 2009


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