Thermotropic Behavior, Packing, and Thin Film Structure of an Electron Accepting Side-Chain Polymer

Titelangaben

Kohn, Peter ; Ghazaryan, Lilit ; Gupta, Gaurav ; Sommer, Michael ; Wicklein, André ; Thelakkat, Mukundan ; Thurn-Albrecht, Thomas:
Thermotropic Behavior, Packing, and Thin Film Structure of an Electron Accepting Side-Chain Polymer.
In: Macromolecules. Bd. 45 (2012) Heft 14 . - S. 5676-5683.
ISSN 1520-5835
DOI: https://doi.org/10.1021/ma3010197

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Abstract

We report on the phase behavior and the structure of poly(perylene bisimide acrylate), an electron accepting semiconductor polymer with disclike side-chain units, in comparison to the corresponding low molecular weight perylene bisimide. By combination of DSC, optical microscopy, and temperature-dependent small-angle and wide-angle X-ray scattering, we show that both compounds display a lamello-columnar packing. While the perylene bisimide model compound crystallizes, the polymeric architecture of poly(perylene bisimide acrylate) suppresses order, leading to a 2D lamello-columnar liquid crystalline phase. The structure of the side-chain polymer in thin films with different thermal treatments as observed by GIWAXS correlates well with previously observed largely different electron mobilities. Such a polymeric, liquid crystalline compound combines the advantages of molecular order and easy processability, together with the film forming properties of polymeric materials.