Controlled synthesis of new amphiphilic glycopolymers with liquid crystal grafts. Issue 18 (28th June 2013)

• Record Type: Journal Article
• Authors: Ferji, Khalid; Nouvel, Cécile; Babin, Jérôme; Albouy, Pierre‐Antoine; Li, Min‐Hui; Six, Jean‐Luc
• Is Part Of: Journal of polymer science. Volume 51:Issue 18(2013:Sep.)
• Page Start: 3829
• Page End: 3839
• Publication Date: 2013-06-28
• Subjects: 547
• DOI: 10.1002/pola.26804
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>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 <italic>N</italic>, <italic>N</italic>, <italic>N</italic>′, <italic>N</italic>′, <italic>N</italic>″‐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‐<italic>g</italic>‐PDEGCholA) have been synthesized. The mesomorphic properties of DEGCholA, PDEGCholA, and Dex‐<italic>g</italic>‐PDEGCholA have been studied by thermal polarizing optical microscopy, differential scanning calorimetry, and X‐ray scattering. PDEGCholA and Dex‐<italic>g</italic>‐PDEGCholA show an interdigitated smectic A phase (SmA_d) between <italic>T</italic>_g (∼30 °C) and around 170 °C. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <bold>2013</bold>, <italic>51</italic>, 3829–3839</p> </abstract>