title: Architecture and solution properties of AB-type brush-block-brush amphiphilic copolymers via ATRP techniques.
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.
authors.affiliation: Department of Organic Materials and Macromolecules, International Research Center of Macromolecular Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan. kishizu@polymer.titech.ac.jp
authors.forename: Koji
authors.initials: K
authors.lastname: Ishizu
authors.forename: Junichiro
authors.initials: J
authors.lastname: Satoh
authors.forename: Atsushi
authors.initials: A
authors.lastname: Sogabe
mesh_terms: D016880:Anisotropy; D002850:Chromatography, Gel; D008027:Light; D008689:Methacrylates / Q000737:chemistry; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D011487:Protein Conformation; D012542:Scattering, Radiation
chemical_list: D008689:Methacrylates; D011108:Polymers; D011109:Polymethacrylic Acids; C500483:poly(2-(2-bromoisobutyryloxy)ethyl methacrylate); D011102:Polyhydroxyethyl Methacrylate; D011092:Polyethylene Glycols; C005044:hydroxyethyl methacrylate