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Author

Kim, Byeong-Su
Soft and Hybrid Nanomaterials Lab
Research Interests
  • Carbon materials, polymer, Layer-by-Layer (LbL) assembly, hyperbranched polymer, polyglycerol (PG), bio-applications

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Molecular brushes with extreme grafted side chain densities

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Title
Molecular brushes with extreme grafted side chain densities
Author
Bak, Jae MinJha, GourishankerAhn, EungjinJung, Seo-HyunJeong, Han MoKim, Byeong-SuLee, Hyung-il
Keywords
Acid hydrolysis; Feed ratios; Grafting densities; Hydroxyethylmethacrylate; Initiation efficiency; Initiation sites; Macroinitiators; Methoxy; Methyl methacrylates; Molecular brushes; N-butyl acrylate; Poly(n-butyl acrylate); Polymerization time; Propionic; Side chain lengths; Side-chains
Issue Date
201207
Publisher
ELSEVIER SCI LTD
Citation
POLYMER, v.53, no.16, pp.3462 - 3468
Abstract
A series of densely grafted poly(n-butyl acrylate) (PBA) molecular brushes with four different grafting densities were synthesized by the "grafting-from" approach using atom transfer radical polymerization (ATRP). A novel monomer, isopropylidene-2,2-Bis(methoxy)propionic hydroxyethylmethacrylate (IMPHMA), was synthesized and copolymerized with methyl methacrylate (MMA) under different monomer feed ratios to yield a series of linear poly(methyl methacrylate-stat-IMAPA), [PMMA-s-(PIMPHMA)]. The resulting copolymers were deprotected and transformed to macroinitiators, [PMMA-s-(PHEMA-IMPHMA-Br)]. n-Butyl acrylate (BA) was grafted from these macroinitiators to yield a series of molecular brushes, [PMMA-s-{(PIMPHMA)-g-PBA}], with various side chain lengths. Molecular brushes were characterized by gel permeation chromatography (GPC) and H-1 NMR. PBA side chains were cleaved by acid hydrolysis, and the resulting linear PBA polymers were characterized by GPC to study initiation efficiency during the synthesis of molecular brushes. The initiation efficiency increased with polymerization time and decreased with macroinitiators that had more initiation sites. Atomic force microscopy (AFM) measurements demonstrated the characteristic molecular structure by resolving individual brush molecules.
URI
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DOI
http://dx.doi.org/10.1016/j.polymer.2012.06.008
ISSN
0032-3861
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