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Title: Imidazolium-substituted ionic (co)polythiophenes: Compositional influence on solution behavior and thermal properties
Authors: GHOOS, Toon 
Brassinne, Jeremy
Fustin, Charles-Andre
Gohy, Jean-Francois
Defour, Maxime
Van den Brande, Niko
Van Mele, Bruno
LUTSEN, Laurence 
MAES, Wouter 
Issue Date: 2013
Source: POLYMER, 54 (23), p. 6293-6304
Abstract: A series of ionic polythiophenes, in homopolymer and random copolymer configurations, is prepared via the Grignard metathesis (GRIM) polymerization protocol and subsequent substitution on the bromohexyl side chains with N-methylimidazole. The introduced structural variations comonomer ratio, side chain composition, counter ions allow tuning of the thermal properties and solution behavior of the resulting conjugated polymers. As expected, the solubility depends majorly on the number of ionic groups and the counter ions. The most peculiar behavior is observed for the P3HT-P3(MIM)HT-Br 50/50 random copolymer, which shows organization of the polymer chains in solution and thin film dependent on the preparation conditions. Dynamic light scattering studies confirm that the ordered solid-state structure is somewhat maintained when the copolymer is dissolved in a bad solvent mixture. The ionic (co)polythiophenes are generally more resistant to thermal degradation than their precursors. The precursor polymers all show a clear semi-crystalline behavior, with a decrease in crystallinity upon decreasing the number of regular 3-hexylthiophene units. On the other hand, the studied ionic (co) polythiophenes are fully amorphous. Changes in the counter ions have dramatic effects on the thermal properties. Bromine counter ions render the polymers strongly hygroscopic. The novel materials are of particular appeal in the field of organic photovoltaics, in which the imidazolium-substituted (co)polythiophenes can be beneficially applied as constituents of either active layers or electron transport layers. Their processability from green solvents is also of major importance for the field. (C) 2013 Elsevier Ltd. All rights reserved.
Keywords: Ionic (co)polythiophenes; Solution behavior; Thermal analysis
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ISSN: 0032-3861
e-ISSN: 1873-2291
DOI: 10.1016/j.polymer.2013.09.049
ISI #: 000326140800004
Category: A1
Type: Journal Contribution
Validations: ecoom 2014
Appears in Collections:Research publications

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