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New water soluble agents for reversible addition-fragmentation chain transfer polymerization and their application in aqueous solutions
- Publication Year :
- 2005
-
Abstract
- A series of nonionic, anionic, and cationic water-soluble monomers bearing the (meth)acrylate, (meth)acrylamide, or styrene moiety were polymerized in water by free-radical polymerization via reversible addition-fragmentation chain transfer (RAFT). Several new water-soluble RAFT agents based on dithiobenzoate were employed that are water soluble independently of the pH. One of them bears a fluorophore, enabling unsymmetrical double end-group labeling as well as the preparation of fluorescent-labeled polymers. The temperature-dependent stability of the new RAFT agents against hydrolysis was studied. Controlled polymerization in aqueous solution was possible with styrenic, acrylic, and methacrylic monomers; molar masses increase with conversion, and polydispersities are relatively low. But RAFT polymerization failed for an anionic itaconate. Whereas polymerizations of methacrylamides were slow at temperatures below 60 degrees C, such conditions proved favorable for the RAFT polymerization of acrylates and methacrylates, to minimize hydrolysis of the dithioester end-group functionality, and to improve the preparation of block copolymers.
- Subjects :
- Polymers and Plastics
Chemistry
Organic Chemistry
Radical polymerization
Cationic polymerization
Chain transfer
macromolecular substances
Inorganic Chemistry
Living free-radical polymerization
Anionic addition polymerization
Polymerization
Polymer chemistry
Materials Chemistry
Organic chemistry
Institut für Chemie
Reversible addition−fragmentation chain-transfer polymerization
Ionic polymerization
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....50ee112779d7d27fec85bfca7003c67e