Controlled high-speed anionic polymerization of propylene oxide initiated by onium salts in the presence of triisobutylaluminum
CARLOTTI, Stéphane
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Leer más >
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
CARLOTTI, Stéphane
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
< Leer menos
Laboratoire de Chimie des polymères organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering
Idioma
en
Article de revue
Este ítem está publicado en
International Journal of Biological Macromolecules. 2007, vol. 40, n° 22, p. 7842-7847
Elsevier
Resumen en inglés
The conventional anionic polymerization of propylene oxide (Pox) proceeds at a very slow rate in low polar media and is characterized by an important transfer. reaction to monomer. This only allows the formation of ...Leer más >
The conventional anionic polymerization of propylene oxide (Pox) proceeds at a very slow rate in low polar media and is characterized by an important transfer. reaction to monomer. This only allows the formation of poly(propylene oxide) oligomers. A new p olymerization strategy allowing the fast and controlled anionic polymerization of Pox has been developed. It is based on the formation of complexes with both the anionic initiator and the monomer. The influences of alkali metal alkoxides (i-PrONa), ammonium salts (NBu4Cl and NOct(4)Br), and phosphonium salts (PBu4Cl) as initiators, in combination with triisobutylaluminum, have been investigated in terms of reactivity, molar mass control, livingness, and polymerization mechanism. PPOx with narrow polydispersities and controlled molar masses, up to 150 000 g/mol, have been obtained in hydrocarbon media, at low temperature, and in short reaction times.< Leer menos
Palabras clave en inglés
Lewis-acid complexes
onium salt initiator
monomer activation
ring-opening polymerization
Orígen
Importado de HalCentros de investigación