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Electrografting onto ITO substrates of poly(thiophene)-based micelles decorated by acrylate groups.

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Ouhib, Farid [Université de Liège] Desbief, Simon [Université de Mons] Lazzaroni, Roberto [Université de Mons] Melinte, Sorin [UCL] Dutu, Constantin Augustin [UCL] Detrembleur, Christophe [Université de Liège]

We report on a simple process for the chemisorption of poly(thiophene)-based block copolymers onto ITO substrates. Two poly(thiophene) block copolymers functionalized by acrylates on the second block are prepared by the Grignard Metathesis (GRIM) process. The !rst block is composed of poly(3-hexylthiophene) (P3HT) and the second block is either a polythiophene bearing an acrylate group on each monomer unit (PAcET), or a polythiophene bearing both acrylate and poly(ethylene glycol) side chains (P(AcET-co-PEGET)). After characterizing their macromolecular parameters and optical properties, we investigate their ability to self-assemble into micelles in DMF solutions. This solvent is required for the electrografting procedure that is used for strongly anchoring the polymer to ITO. These micelles are expected to be formed by a P3HT core and a PAcET or P(AcET-co-PEGET) shell. When PEG side chains are present in the second block, the copolymer nicely self-assembles into micelles decorated by acrylates. Cathodic polarization of ITO induces chemisorption and polymerization of acrylate groups, leading to an adherent organized !lm of poly(thiophene)-based micelles. The optical absorption spectra show that the electrografted polymer chains have a degree of p-electron conjugation similar to that of crystalline P3HT !lms. In the absence of the PEG chains, the copolymer does not organize into micelles, due to the low stabilizing ability of the second block in DMF.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2013
Language Anglais
Journal information "Polymer Chemistry" - Vol. 4, no. 15, p. 4151-4161 (2103)
Peer reviewed yes
Publisher Royal Society of Chemistry
issn 1759-9954
e-issn 1759-9962
Publication status Publié
Affiliation UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique
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Bibliographic reference Ouhib, Farid ; Desbief, Simon ; Lazzaroni, Roberto ; Melinte, Sorin ; Dutu, Constantin Augustin ; et. al. Electrografting onto ITO substrates of poly(thiophene)-based micelles decorated by acrylate groups.. In: Polymer Chemistry, Vol. 4, no. 15, p. 4151-4161 (2103)
Permanent URL http://hdl.handle.net/2078.1/131521