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(Diisopropylamido) bis (methylcyclopentadienyl) lanthanides as single-component initiators for polymerization of methyl methacrylate

✍ Scribed by Lisheng Mao; Qi Shen

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 117 KB
Volume: 36
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19980730)36:10<1593::aid-pola11>3.0.co;2-b

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✦ Synopsis

It was first found that (diisopropylamido)bis(methylcyclopentadienyl)lanthanides (MeC 5 H 4 ) 2 LnN(i-Pr) 2 (THF) (Ln Å Yb ( 1), Er ( 2), Y (3)) exhibit extremely high catalytic activity in the polymerization of methyl methacrylate. The reactions can be carried out over a quite broad range of polymerization temperatures from 078 to 40ЊC. The catalytic activity of the complexes increases with an increase of ionic radii of the metal elements, i.e. Y ú Er ú Yb. The results of GPC (gel permeation chromatography) indicate that the number-average molecular weights (M n ) of polymers obtained exceed 100 1 10 3 and the molecular weight distribution ( M w /M n ) becomes broad with the increase of temperature. Furthermore highly syndiotactic PMMA (87.7%) can be obtained by lowering the reaction temperature to 078ЊC.

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