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Synthesis of novel polybutadiene‐ graft ‐poly(sodium methacrylate) amphiphilic copolymers as precursors for liquid crystalline graft copolymers
Author(s) -
Gohy JeanFrançois,
Charlier Christelle,
Zhang JianXin,
Dubois Philippe,
Jérôme Robert
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990701)200:7<1630::aid-macp1630>3.0.co;2-e
Subject(s) - copolymer , polybutadiene , polymer chemistry , methacrylate , mesogen , mesophase , micelle , amphiphile , materials science , chemistry , organic chemistry , polymer , phase (matter) , liquid crystalline , aqueous solution
Well‐defined polybutadiene‐ graft ‐poly( tert ‐butyl methacrylate) (PBD‐ g ‐PtBMA) copolymers were prepared by reaction of PtBMA chains end‐capped with a tert ‐butyl 4‐vinylbenzoate (tBVB) anion, with the selectively hydrosilylated 1,2‐units of anionically synthesized PBD. Substitution of the tBVB anion for the anion of living PtBMA chains is required for the formation of the expected C‐silylation product instead of the unstable O‐silylation one. Subsequent hydrolysis of the poly( tert ‐butyl methacrylate) grafts followed by neutralization of the carboxylic acid groups by sodium hydroxide leads to amphiphilic polybutadiene‐ graft ‐poly(sodium methacrylate) (PBD‐ g ‐PNaMA) graft copolymers. These copolymers form unimeric micelles in water, as observed by dynamic light scattering (DLS). Non‐covalent liquid crystalline graft copolymers were prepared by cation exchange between PBD‐ g ‐PNaMA copolymers and an ammonium containing smectic mesogen. These copolymers form a smectic mesophase which is microphase separated from PBD.