Metathetic degradation of trans-1,4-polyisoprene with ruthenium catalysts
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
PERUCH, Frédéric
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
Polymer Degradation and Stability. 2014, vol. 99, p. 249-253
Elsevier
Resumen en inglés
Degradation study of trans-1,4-polyisoprene (trans-1,4-PI), that can be produced by the nature, was performed using first and second generation Grubbs and Hoveyda Grubbs catalysts with olefins (ethylene or 1-octene) as ...Leer más >
Degradation study of trans-1,4-polyisoprene (trans-1,4-PI), that can be produced by the nature, was performed using first and second generation Grubbs and Hoveyda Grubbs catalysts with olefins (ethylene or 1-octene) as transfer agents in toluene at 60 C. While first generation Grubbs catalyst afforded low degradation, highlighting the presence of catalyst decomposition and/or inter-chain cross-metathesis reactions, an almost complete metathetic degradation could be reached using the second generation Grubbs catalyst in few minutes. Nevertheless, the synthesis of well-defined polyisoprenes with a targeted molar mass revealed to be difficult with Grubbs catalysts. On the contrary, Hoveyda Grubbs catalysts were found to be more efficient to control the degradation of trans-1,4-PI. Indeed, regioselective degradation afforded pure trans-1,4-PI with a range of molar mass from 50 000 g/mol to 10 000 g/mol. However, polyisoprenes of lower molar masses (M-n < 10 000 g/mol) contained some cis units, highlighting the presence of isomerization reactions, which could be due to the catalyst decomposition into hydride specie and/or pi-allyl metal hydride< Leer menos
Palabras clave en inglés
Octene
Metathetic degradation
Trans-1
4-polyisoprene
Ruthenium catalysts
Ethylene
Orígen
Importado de HalCentros de investigación