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  • Title: Architecture and solution properties of AB-type brush-block-brush amphiphilic copolymers via ATRP techniques.
    Author: Ishizu K, Satoh J, Sogabe A.
    Journal: J Colloid Interface Sci; 2004 Jun 15; 274(2):472-9. PubMed ID: 15144819.
    Abstract:
    Atom transfer radical polymerization (ATRP) was applied to the synthesis of AB-type brush-block-brush amphiphilic copolymers. The procedure included the following steps: (1). ATRP of methacryloyl-terminated poly(ethylene glycol methylether) macromonomer (PEG-MC) gave well-defined PEG brush macroinitiator, (2). subsequent ATRP of 2-hydroxyethyl methacrylate (HEMA) with this brush macroinitiator provided PEG brush-block-PHEMA (brush-block-coil) diblock copolymers, (3). esterification of the pendant hydroxy groups of PHEMA block with 2-bromoisobutyryl bromide yielded a block-type polyinitiator, brush-block-poly(2-(2-bromoisobutyryloxy)ethyl methacrylate) (PBIEM), (4). ATRP of HEMA using brush-block-PBIEM as polyinitiator provided AB-type brush-block-brush amphiphilic copolymers. Dilute-solution properties of such AB-type copolymer brushes were investigated by static and dynamic light scatterings. As a result, this copolymer exhibited a slightly ellipsoidal shape, i.e., Janus-type structure, in solution.
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