RAFT-Living polymerization / Sanvi Vaibhav Nirgun in PAINTINDIA, Vol. LXIII, N° 5 (05/2013)

[article]  inPAINTINDIA > Vol. LXIII, N° 5 (05/2013) . - p. 53-67 Titre : RAFT-Living polymerization Type de document : texte imprimé Auteurs : Sanvi Vaibhav Nirgun, Auteur Année de publication : 2013 Article en page(s) : p. 53-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Polymérisation par transfert de chaîne réversible par addition fragmentation La polymérisation radicalaire contrôlée par transfert de chaîne réversible par addition-fragmentation (en anglais Reversible Addition-Fragmentation Chain Transfer (RAFT)) est une technique de polymérisation radicalaire contrôlée. Au même titre que la polymérisation radicalaire contrôlée par transfert d'atome (en anglais Atom Transfert Radical Polymerization (ATRP)) et la polymérisation radicalaire en présence de nitroxydes (en anglais Nitroxide Mediated Polymerization (NMP)), la polymérisation de type RAFT permet de synthétiser des polymères d'architecture contrôlée (polymères à blocs, étoiles, peignes, etc) de faible polydispersité et de haute fonctionnalité. Les applications de ces polymères sont, parmi d'autres, l'encapsulation de principes actifs de médicaments, la production de revêtements et peintures de nouvelles génération, la microfluidique, les tensioactifs, les adhésifs et les membranes. Index. décimale : 668.9 Polymères Résumé : Synthetic polymers are essential elements of modem life. Several methods have been developed over the years to attain control of radical polymerizations. In all cases, the optimization of organic compounds was the key step. The new process — RAFT (Reversible Addition-Fragmentation Chain Transfer) technology is a living radical polymerization process that provides a mechanism for precisely controlling the way in which small molecules are linked together to form large polymer chains. RAFT polymerization is known for its compatibility with a wide range of monomers compared to other controlled radical polymerizations. These monomers include (meth)acrylates, (meth)acrylamides, acrylonitrile, styrene and derivatives, butadiene, vinyl acetate and N-vinylpyrrolidone. This work has revolutionized polymer synthesis and spawned a new generation of polymeric materials. Mankind will benefit from the development of a wide range of new materials for many different applications including: biomedical, coatings, lubricants, industrial polymers, personal care and cosmetics, and electronics. RAFT is a promising candidate for answering both the increasing need of modern society to employ highly functional polymeric materials and the global requirements for developing sustainable chemicals and processes. Note de contenu : - HISTORY : Important components of RAFT - THE RAFT AGENT - WHAT IS RAFT POLYMERIZATION ? - CLASSES OF RAFT AGENTS : How to select RAFT agents - RAFT MECHANISM : RAFT agent to monomer compatibility - WIDE RANGE OF GRADIENT AND BLOCK COPOLYMER : Synthesis of gradient and block copolymers - Synthesis of star polymers (Star polymers from a core first approach) - Z approach versus R approach (Star polymers via an arm first methodology) - Synthesis of graft and comb copolymers - Synthetic approaches to hyperbranched & nanogel polymers (soluble products) - Gels and hydrogels (insoluble products) - NANOMATERIAL SYNTHESIS : Micelles - Vesicles and more complex architectures - Synthesis of hybrid nanoparticles - Carbon nanotubes, nanodiamond and graphene - Metallic and oxide nanoparticles : silica nanoparticles (Iron oxide nanoparticles) - Gold, silver nanoparticles and quantum dots - POLYMERS FOR BIO-APPLICATIONS : protein/peptide polymer conjugates - siRNA/DNA polymers conjugates - Glycopolymers - SURFACE MODIFICATIONS : Preparation of honeycomb films - STRENGTH RAFT : Current challenges and scopes in RAFT chemistry - Challenge in understanding the kinetics and mechanism - Facile access to RAFT agents and commercial availability - Accessible monomer range - Block copolymer formation and access to universal RAFT agents - SCOPE FOR THE USE OF RAFT POLYMERS : Large scale industrial - Nano- and microsctructured materials - Exploiting thio carbonylthio endgrou chemistry - Employing the RAFT process as a kinetic tool Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18970 [article]

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