TY  - JOUR
A1  - Garnier, Sebastien
A1  - Laschewsky, Andre
T1  - Non-ionic amphiphilic block copolymers by RAFT-polymerization and their self-organization
JF  - Colloid and polymer science : official journal of the Kolloid-Gesellschaft
N2  - Water-soluble, amphiphilic diblock copolymers were synthesized by reversible addition fragmentation chain transfer polymerization. They consist of poly(butyl acrylate) as hydrophobic block with a low glass transition temperature and three different nonionic water-soluble blocks, namely, the classical hydrophilic block poly(dimethylacrylamide), the strongly hydrophilic poly(acryloyloxyethyl methylsulfoxide), and the thermally sensitive poly(N-acryloylpyrrolidine). Aqueous micellar solutions of the block copolymers were prepared and characterized by static and dynamic light scattering analysis (DLS and SLS). No critical micelle concentration could be detected. The micellization was thermodynamically favored, although kinetically slow, exhibiting a marked dependence on the preparation conditions. The polymers formed micelles with a hydrodynamic diameter from 20 to 100 nm, which were stable upon dilution. The micellar size was correlated with the composition of the block copolymers and their overall molar mass. The micelles formed with the two most hydrophilic blocks were particularly stable upon temperature cycles, whereas the thermally sensitive poly(N-acryloylpyrrolidine) block showed a temperature-induced precipitation. According to combined SLS and DLS analysis, the micelles exhibited an elongated shape such as rods or worms. It should be noted that the block copolymers with the most hydrophilic poly(sulfoxide) block formed inverse micelles in certain organic solvents.
KW  - macrosurfactants
KW  - block copolymers
KW  - micelles
KW  - inverse micelles
KW  - sulfoxide
Y1  - 2006
U6  - https://doi.org/10.1007/s00396-006-1484-9
SN  - 0303-402X
VL  - 284
SP  - 1243
EP  - 1254
PB  - Springer
CY  - Berlin
ER  - 
TY  - GEN
A1  - Lutz, Jean-Francois
A1  - Kristen, Juliane
A1  - Skrabania, Katja
A1  - Laschewsky, Andre
T1  - POLY 14-Synthetic strategies for preparing multicompartment micelles
T2  - Abstracts of papers / American Chemical Society
N2  - The fabrication of compartmented micellar systems is an exciting new area of research in the field of polymer self-assembly. Multicompartment micelles composed of a water-soluble shell and a segregated hydrophobic core can be obtained via direct aqueous self-assembly of preformed polymeric amphiphiles possessing one hydrophilic segment and two incompatible hydrophobic segments (e.g. hydrocarbon and fluorocarbon blocks). Such macromolecular building-blocks were prepared in the present work principally via reversible addition-fragmentation transfer polymerization (RAFT). Polysoaps or triblock macrosurfactants can be synthesized in high yields by RAFT under relatively straightforward experimental conditions.
Y1  - 2006
SN  - 0-8412-7426-6
SN  - 0065-7727
VL  - 232
PB  - American Chemical Society
CY  - Washington
ER  -