Influence of polymerization conditions on microstructure of norbornene-ethylene copolymers made using metallocene catalysts and MAO

Autor:	Taito Väänänen, Jukka Seppälä, Christer Bergstrom
Rok vydání:	1997
Předmět:	Zirconium Ethylene Polymers and Plastics chemistry.chemical_element General Chemistry Surfaces Coatings and Films Catalysis Ethylene bis chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Metallocene Norbornene
Zdroj:	Journal of Applied Polymer Science. 63:1071-1076
ISSN:	1097-4628 0021-8995
DOI:	10.1002/(sici)1097-4628(19970222)63:8<1071::aid-app14>3.0.co;2-9
Popis:	When characterized with 13C-NMR, it was found that norbornene-ethylene copolymers had a more complicated microstructure when dimethylsilyl bis(indenyl) zirconium dichloride was used as the catalyst compared to ethylene bis(indenyl) zirconium dichloride. One could see more block sequences but less alternating sequences. For both catalysts the highest amounts of block sequences were obtained for high norbornene concentrations, medium to high Al/Zr ratios, and low polymerization temperatures. There were also more alternating sequences for high norbornene concentrations and high polymerization temperatures. The isolated norbornene units (separated by more than one ethylene unit) were all exoconfiguration. No unsaturation was seen. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1071–1076, 1997
Databáze:	OpenAIRE
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