Mechanism of rare-earth catalysis in coordination polymerization

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Ind. Eng. Chem., Prod. Res. Dev.; (United States)

DOI:https://doi.org/10.1021/i300023a016· OSTI ID:6808429

Hsleh, H L; Yeh, G H.C.

The microstructure and stereospecificity of a variety of 1.3-diene polymers prepared with lanthanide coordination catalysts were examined. In contrast to the conventional d-orbital transition-metal catalysts, the lanthanide catalysts would polymerize 1,3-diene monomers prevailingly in a 1,4-addition manner. The cis and trans 1,4-stereoregular polymerizations depend on the steric and electronic structures of the dienes. Under the same lanthanide catalysts the 1,4-dimethylbutadiene (e.g., trans, trans-2,4-hexadiene) leads exclusively to trans-1,4 polymers, the 2,3-dimethylbutadiene gives mainly cis-1,4 polymers, and the 1,3-dimethylbutadiene (e.g., trans-2-methyl-1,3-pentadiene) produces mixed trans/cis (60/40) 1,4-polymers. The ligands in the lanthanide catalyst and the polymerization conditions have relatively little effect on the stereoregulation.

• Research Organization: Phillips Petroleum Co., Bartlesville, OK
• OSTI ID: 6808429
• Journal Information: Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 25:3; ISSN IEPRA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BUTADIENE
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DIENES
ELECTRONIC STRUCTURE
ELEMENTS
HYDROCARBONS
ISOMERIZATION
LIGANDS
METALS
MICROSTRUCTURE
MONOMERS
ORGANIC COMPOUNDS
PENTADIENES
POLYENES
POLYMERIZATION
POLYMERS
RARE EARTHS
STEREOCHEMISTRY
SYNTHESIS
TRANSITION ELEMENTS