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Self-Assembly of Amphiphilic Liquid Crystal Polymers Obtained from a Cyclopropane-1,1-Dicarboxylate Bearing a Cholesteryl Mesogen
journal contribution
posted on 2012-07-31, 00:00 authored by Lin Jia, Ming Liu, Aurélie Di Cicco, Pierre-Antoine Albouy, Blandine Brissault, Jacques Penelle, Sylvie Boileau, Valessa Barbier, Min-Hui LiWe study the self-assembly of a new family of amphiphilic
liquid
crystal (LC) copolymers synthesized by the anionic ring-opening polymerization
of a new cholesterol-based LC monomer, 4-(cholesteryl)butyl ethyl
cyclopropane-1,1-dicarboxylate. Using the t-BuP4 phosphazene base and thiophenol or a poly(ethylene glycol)
(PEG) functionalized with thiol group to generate in situ the initiator during the polymerization, LC homopolymer and amphiphilic
copolymers with narrow molecular weight distributions were obtained.
The self-assemblies of the LC monomer, homopolymer, and block copolymers
in bulk and in solution were studied by small-angle X-ray scattering
(SAXS), differential scanning calorimetry (DSC), polarizing optical
microscopy (POM), and transmission electron microscopy (TEM). All
polymers exhibit in bulk an interdigitated smectic A (SmAd) phase with a lamellar period of 4.6 nm. The amphiphilic copolymers
self-organize in solution into vesicles with wavy membrane and nanoribbons
with twisted and folded structures, depending on concentration and
size of LC hydrophobic block. These new morphologies will help the
comprehension of the fascinating organization of thermotropic mesophase
in lyotropic structures.
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scanning calorimetrysolutionlamellar periodLC homopolymerAmphiphilic Liquid Crystal Polymers ObtainedSAXSDSC4.6 nminterdigitated smecticCholesteryl MesogenWe studyPEGLC monomerTEMpolymerizationthiol groupbulkthermotropic mesophasetransmission electron microscopypolymers exhibitamphiphilic copolymersPOMblock copolymersweight distributionslyotropic structures
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