Brush-Type Amphiphilic Diblock Copolymers from “Living”/Controlled Radical Polymerizations and Their Aggregation Behavior

Two brush-type amphiphilic diblock copolymers, poly(poly(ethylene glycol)methyl ether methacrylate-block-polystyrene) (P(PEGMA)-b-PS) and poly(glycidyl methacrylate)-block-poly(poly(ethylene glycol)methyl ether methacrylate) (P(GMA)-b-P(PEGMA)) were synthesized, respectively, via consecutive atom-tr...

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Veröffentlicht in:Langmuir 2005-08, Vol.21 (16), p.7180-7185
Hauptverfasser: Cheng, Zhu, Kang, E. T, Neoh, K. G
Format: Artikel
Sprache:eng
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Zusammenfassung:Two brush-type amphiphilic diblock copolymers, poly(poly(ethylene glycol)methyl ether methacrylate-block-polystyrene) (P(PEGMA)-b-PS) and poly(glycidyl methacrylate)-block-poly(poly(ethylene glycol)methyl ether methacrylate) (P(GMA)-b-P(PEGMA)) were synthesized, respectively, via consecutive atom-transfer radical polymerizations (ATRPs) and reversible addition-fragmentation chain-transfer (RAFT) polymerizations. The diblock copolymers were characterized by gel permeation chromatography (GPC), 1H nuclear magnetic resonance (NMR) spectroscopy, and FT-IR spectroscopy. The aggregation behavior of the two amphiphilic diblock copolymers in water was also studied. Scanning electron and transmission electron microscopic images revealed that spherical micelles (40−80 nm in diameter) from self-assembly of the P(PEGMA)-b-PS copolymers and wormlike micelles (60−120 nm in length and 20−30 nm in diameter) from self-assembly of the P(GMA)-b-P(PEGMA) copolymers were prevalent. The spherical P(PEGMA)-b-PS micelles could self-assemble gradually into giant aggregates of several micrometers in diameter.
ISSN:0743-7463
1520-5827
DOI:10.1021/la051038y