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Issue 7, 2016
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Influence of side chains on the self-alignment capability of electroluminescent polyfluorenes

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Abstract

We report a significant role of side chains in the propagation of molecular orientation upon annealing the liquid crystal phase of polyfluorenes. Direct rubbing of poly(9,9-di(octyl)fluorene) led to the orientation of polymer segments in the top-most region of the film and enhanced propagation of this orientation along the rubbing direction was observed upon annealing. In contrast, the rubbing-induced molecular orientation of poly(9,9-di(ethylhexyl)fluorene) segments completely disappeared upon annealing in the nematic melt state. The higher order of the side chain structures in poly(9,9-di(octyl)fluorene) were found to allow the propagation of the three-dimensional molecular alignment. From integrated experimental and density functional theory studies, we propose that side chain interdigitation generates a unique alignment behavior of poly(9,9-di(octyl)fluorene).

Graphical abstract: Influence of side chains on the self-alignment capability of electroluminescent polyfluorenes

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Article information


Submitted
03 Dec 2015
Accepted
24 Dec 2015
First published
24 Dec 2015

Soft Matter, 2016,12, 1983-1988
Article type
Paper
Author version available

Influence of side chains on the self-alignment capability of electroluminescent polyfluorenes

S. Lee, Y. Yang, S. Kwon and Y. Jung, Soft Matter, 2016, 12, 1983
DOI: 10.1039/C5SM02927A

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