Homogeneous metallocene/MAO-catalyzed polymerizations of polar norbornene derivatives: copolymerizations using ethene, and terpolymerizations using ethene and norbornene
β Scribed by Ralf Alexander Wendt; Gerhard Fink
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 108 KB
- Volume
- 201
- Category
- Article
- ISSN
- 1022-1352
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π SIMILAR VOLUMES
Metallocene catalysts Et(Ind) 2 ZrCl 2 /MAO and Et(Ind) 2 H fCl 2 /MAO were used in ethene/propene copolymerization and in ethene/propene/5-ethylidene-2-norbornene (E/P/ENB) terpolymerization. The copolymerization activity of the Et(Ind) 2 ZrCl 2 / MAO system was 20 1 10 3 kg polym /mol Mt \* h, the
When characterized with 13 C-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 a
Using 70 mol % norbornene in the monomer mixture before polymerization, the influences of different polymerization conditions were studied. It was found that by increasing the temperature from 10 to 70ΠC, the yield increased and the molecular weight decreased; and when increasing the ethylene pressu