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Highly Active Yttrium and Lanthanide Catalysts for Polymerization of Isobutene
Author(s) -
Touchard Virginie,
Spitz Roger,
Boisson Christophe,
Llauro MarieFrance
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400419
Subject(s) - lanthanide , yttrium , catalysis , polymerization , chemistry , raman spectroscopy , polymer , lewis acids and bases , polymer chemistry , nuclear magnetic resonance spectroscopy , inorganic chemistry , organic chemistry , oxide , ion , physics , optics
Summary: Highly active catalysts for isobutene polymerization were obtained by mixing silica with yttrium or lanthanide chloride salts. Solid catalysts were investigated using transmission electron microscopy and Raman spectroscopy. Both Lewis and Brönsted acid sites were detected on the surface. Polymers of low and medium molecular weight were prepared and their unsaturated chain ends were fully investigated by one‐ and two‐dimensional NMR analyses.13 C NMR spectrum of a low‐molecular‐weight polyisobutene (high‐field resonance region).