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Main Title: Synthesis and self-assembly of amphiphilic semi-brush and dual brush block copolymers in solution and on surfaces
Author(s): Zehm, Daniel
Laschewsky, André
Heunemann, Peggy
Gradzielski, Michael
Prévost, Sylvain
Liang, Hua
Rabe, Jürgen P.
Lutz, Jean-François
Type: Article
Language Code: en
Abstract: The combination of two techniques of controlled free radical polymerization, namely the reversible addition fragmentation chain transfer (RAFT) and the atom transfer radical polymerization (ATRP) techniques, together with the use of a macromonomer allowed the synthesis of symmetrical triblock copolymers, designed as amphiphilic dual brushes. One type of brush was made of poly(n-butyl acrylate) as soft hydrophobic block, i.e. characterized by a low glass transition temperature, while the other one was made of hydrophilic poly(ethylene glycol) (PEG). The new triblock polymers represent “giant surfactants” according to their molecular architecture. The hydrophobic and hydrophilic blocks microphase separate in the bulk. In aqueous solution, they aggregate into globular micellar aggregates, their size being determined by the length of the stretched polymer molecules. As determined by the combination of various scattering techniques for the dual brush copolymer, a rather compact structure is formed, which is dominated by the large hydrophobic poly(n-butyl acrylate) block. The aggregation number for the dual brush is about 10 times larger than for the “semi-brush” precursor copolymer, due to the packing requirements for the much bulkier hydrophobic core. On mica surfaces the triblock copolymers adsorb with worm-like backbones and stretched out side chains.
Issue Date: 2011
Date Available: 1-Jul-2016
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, SFB 448, Mesoskopisch strukturierte Verbundsysteme
Journal Title: Polymer chemistry
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 2
Issue: 1
Publisher DOI: 10.1039/c0py00200c
Page Start: 137
Page End: 147
EISSN: 1759-9962
ISSN: 1759-9954
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Inst. Chemie » Publications

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