Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.eurpolymj.2009.07.018
Title: Cationic polyfluorene: Conformation and aggregation in a "good" solvent
Authors: Wågberg, T.
Liu, B. 
Orädd, G.
Eliasson, B.
Edman, L.
Keywords: Aggregation
Conformation
Conjugated polyelectrolyte
Hydrophilic
Hydrophobic
Solvent
Issue Date: Nov-2009
Citation: Wågberg, T., Liu, B., Orädd, G., Eliasson, B., Edman, L. (2009-11). Cationic polyfluorene: Conformation and aggregation in a "good" solvent. European Polymer Journal 45 (11) : 3230-3235. ScholarBank@NUS Repository. https://doi.org/10.1016/j.eurpolymj.2009.07.018
Abstract: The conjugated polyelectrolyte (CPE) poly{9,9′-bis[6″-(N,N,N-trimethylammonium)-hexylfluorene-alt-co-phenylene] dibromide} (PFPN+Br-) demonstrates a high solubility in methanol in comparison to other more hydrophilic or hydrophobic solvents. We have employed a combination of pulsed-field-gradient-NMR, photoluminescence (PL), and Raman spectroscopy to establish the conformation and aggregation behavior of PFPN+Br- in methanol, with the aim to attain information on how to design CPEs with a high solubility in a preferred solvent. We find that the diffusion coefficient and PL spectrum of PFPN+Br-, as well as the Raman-active methyl rocking mode of methanol, all exhibit a strong dependence on PFPN+Br- concentration. We rationalize our findings with a model in which PFPN+Br- forms aggregates via π-π interactions between main-chain segments, while the ionic side chains are surrounded and electrostatically screened by the methanol solvent. Accordingly, the notably high solubility of PFPN+Br- in methanol is rationalized by favorable interactions between the ionic side chains and the methanol molecules. We propose that an appropriate design of a high-solubility CPE should consider a matching of the mixed hydrophobic/hydrophilic character of the ionic side chain with that of the preferred solvent. © 2009 Elsevier Ltd. All rights reserved.
Source Title: European Polymer Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/88626
ISSN: 00143057
DOI: 10.1016/j.eurpolymj.2009.07.018
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