Controlled synthesis of new amphiphilic glycopolymers with liquid crystal grafts |
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| Authors: | Khalid Ferji Cécile Nouvel Jérôme Babin Pierre‐Antoine Albouy Min‐Hui Li Jean‐Luc Six |
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| Affiliation: | 1. Laboratoire de Chimie Physique Macromoléculaire LCPM, Université de Lorraine, , Nancy, F‐54000 France;2. Laboratoire de Chimie Physique Macromoléculaire LCPM, , Nancy, F‐54000 France;3. Laboratoire de Physique des Solides, Université Paris‐Sud, , F‐91405 Orsay Cedex, France;4. Institut Curie, CNRS, Laboratoire Physico‐Chimie Curie, Université Pierre et Marie Curie, , F‐75248 Paris cedex 05, France |
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| Abstract: | A cholesterol‐based liquid crystal monomer, diethylene glycol cholesteryl ether acrylate (DEGCholA), has been successfully polymerized by atom transfer radical polymerization (ATRP) for the first time. Appropriate experimental conditions to control the polymerization of DEGCholA have been investigated using a model initiator (ethyl 2‐bromoisobutyrate) in tetrahydrofuran (THF) or toluene at 60 °C. Well‐controlled ATRP of DEGCholA was obtained using N,N,N′,N′,N″‐pentamethyldiethylenetriamine as ligand in THF at 60 °C. These conditions were then applied to initiate the ATRP of DEGCholA from multifunctional macroinitiators based on dextran. Using a protection/deprotection synthetic scheme, novel graft glycopolymers (Dex‐g‐PDEGCholA) have been synthesized. The mesomorphic properties of DEGCholA, PDEGCholA, and Dex‐g‐PDEGCholA have been studied by thermal polarizing optical microscopy, differential scanning calorimetry, and X‐ray scattering. PDEGCholA and Dex‐g‐PDEGCholA show an interdigitated smectic A phase (SmAd) between Tg (～30 °C) and around 170 °C. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51, 3829–3839 |
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| Keywords: | amphiphilic atom transfer radical polymerization (ATRP) cholesterol dextran glycopolymer graft copolymers liquid crystal copolymer polysaccharides |
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