Carbocationic polymerization of isoprene initiated by dimethylallyl derivatives associated with B(C6F5)(3)
OUARDAD, Samira
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
DEFFIEUX, Alain
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
PERUCH, Frédéric
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
OUARDAD, Samira
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
DEFFIEUX, Alain
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
PERUCH, Frédéric
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
< Réduire
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Langue
en
Article de revue
Ce document a été publié dans
Polymer Chemistry. 2013, vol. 46, n° 6, p. 1874-1882
Royal Society of Chemistry - RSC
Résumé en anglais
The cationic polymerization of isoprene using dimethylallyl derivatives (3,3-DMAX)-B(C6F5)(3) as initiating systems has been investigated in detail. In most cases, oligomers of low molar mass (M-n <= 1500 g mol(-1)) and ...Lire la suite >
The cationic polymerization of isoprene using dimethylallyl derivatives (3,3-DMAX)-B(C6F5)(3) as initiating systems has been investigated in detail. In most cases, oligomers of low molar mass (M-n <= 1500 g mol(-1)) and narrow molar mass distribution (M-w/M-n <= 2) were formed, which contain isoprene units almost exclusively in a trans-1,4-configuration in combination with saturated ones, with sometimes a higher polymer fraction of high dispersity. Most of the oligomers are terminated by an olefinic terminal group due to intensive transfer via proton elimination whereas a small proportion of X-functionalized oligomers results from chain end recombination with the counterion. Besides, the high molar mass fraction is formed firstly via protonation of oligomer double bonds followed by propagation at low conversion and then via intermolecular branching yielding polyisoprenes with a high branching degree and/or gel formation at high monomer conversion. Most of the elementary reactions involved in these processes were shown to be dependent on the counteranion X of 3,3-DMAX.< Réduire
Mots clés en anglais
ANIONS
SALTS
INSPIRED CATIONIC-POLYMERIZATION
OF-THE-ART
NATURAL-RUBBER
ALTERNATIVE SOURCES
POLYISOPRENE
BIOSYNTHESIS
Origine
Importé de halUnités de recherche