Abstract
Copolymerization of ethylene or propylene and norbornene (NB) was carried out with stereospecific zirconocene catalysts rac-ethylenebis(indenyl)zirconium dichloride, rac-dimethylsilylenebis(indenyl)zirconium dichloride (2), rac-dimethyl-silylenebis(2-methylindenyl)zirconium dichloride, and diphenylmethylene(cyclopentadienyl)(9-fluorenyl)zirconium dichloride combined with cocatalysts at 40°C. Temperature-rising elution fractional of the copolymers was carried out with cross-fractionation chromatography with o-dichlorobenzene as a solvent, and a broad distribution of the copolymer composition was detected. The fraction eluted at lower temperature contained higher NB. The effect of the polymerization time was examined in the ethylene-NB copolymerization with catalyst 2, and the higher-temperature elution fraction increased with increasing polymerization time.
| Original language | English |
|---|---|
| Pages (from-to) | 441-448 |
| Number of pages | 8 |
| Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
| Volume | 41 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2003 Feb 1 |
Keywords
- Composition distribution
- Copolymerization
- Norbornene
- Polyethylene
- Polypropylene
- Temperature-rising elution fractionation
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry