TY  - JOUR
A1  - Baussard, Jean-Francois
A1  - Habib-Jiwan, Jean-Louis
A1  - Laschewsky, André
A1  - Mertoglu, Murat
A1  - Storsberg, Joachim
T1  - New chain transfer agents for reversible addition-fragmentation chain transfer (RAFT) polymerisation in aqueous media : 1. Synthesis and stability in water
N2  - New chain transfer agents for free radical polymerisation via reversible addition-fragmentation chain transfer (RAFT) were synthesised that are particularly suited for aqueous solution polymerisation. The new compounds bear dithioester and trithiocarbonate moieties as well as permanently ionic groups to confer solubility in water. Their stability against hydrolysis was studied, and compared with the one of a frequently employed water-soluble RAFT agent, using UV-Vis-spectroscopy and H-1-NMR measurements. An improved resistance to hydrolysis was found for the new RAFT agents compared to the reference one, providing good stabilities in the pH range between 1 and 8, and up to temperatures of 70 degreesC. (C) 2004 Elsevier Ltd. All rights reserved
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Kubowicz, Stephan
A1  - Baussard, Jean-Francois
A1  - Lutz, Jean-Francois
A1  - Thünemann, Andreas F.
A1  - von Berlepsch, Hans
A1  - Laschewsky, André
T1  - Multicompartment micelles formed by self-assembly of linear ABC triblock copolymers in aqueous medium
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Baussard, Jean-Francois
A1  - Habib-Jiwan, Jean-Louis
A1  - Laschewsky, André
T1  - Enhanced Förster resonance energy transfer in electrostatically self-assembled multilayer films made from new fluorescent labeled polycations
Y1  - 2003
ER  - 
TY  - JOUR
A1  - Laschewsky, André
A1  - Mallwitz, Frank
A1  - Baussard, Jean-Francois
A1  - Cochin, Didier
A1  - Fischer, Peter
A1  - Habib-Jiwan, Jean-Louis
A1  - Wischerhoff, Erik
T1  - Aggregation phenomena in polyelectrolyte multilayers made from polyelectrolytes bearing bulky functional, hydrophobic fragments
N2  - The functionalization of polyelectrolyte multilayers often implies the use of bulky functional fragments, attached to a standard polyelectrolyte matrix. Despite of the high density of non-charged, often hydrophobic substituents, regular film growth by sequential adsorption proceeds easily when an appropriate polyelectrolyte counter ion is chosen. However, the functional fragments may cluster or aggregate. This complication is particularly evident when using chromophores and fluorophores as bulky pendant groups. Attention has to be paid to this phenomenon for the design of functional polyelectrolyte films, as aggregation may modify crucially the properties. The use of charged spacer groups does not necessarily suppress the aggregation of functional side groups. Still, clustering and aggregation depend on the detailed system employed, and are not obligatory. In the case of cationic poly(acrylamide)s labeled with naphthalene and pyrene fluorophores, for instance, the polymers form intramolecular hydrophobic associates in solution, as indicated by strong excimer formation. But the polymers can undergo a conformational rearrangement upon adsorption so that they are decoiled in the adsorbed films. Analogous observations are made for polyanions bearing mesogenic biphenyls fragments. In contrast, polycations functionalized with the dye coumarin 343 show little aggregation in solution, but a marked aggregation in the ESA films
Y1  - 2004
ER  -