Effect of co-catalyst system on α-olefin polymerization with rac- and meso-[dimethylsilylenebis(2,3,5-trimethyl-cyclopentadienyl)]zirconium dichloride
✍ Scribed by Naofumi Naga; Kooji Mizunuma
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 375 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Propene, 1‐butene and 1‐hexene polymerization was conducted with a mixture of rac‐ and meso‐[dimethylsilylenebis((2,3,5‐tetramethyl‐cyclopentadienyl))]zirconium dichloride (Me~2~Si(2,3,5‐Me~3~Cp)~2~ZrCl~2~) (1) combined with methylaluminoxane (MAO), triethylaluminium (AlEt~3~)/triphenylcarbenium tetrakis(pentafluorophenyl)borate (Ph~3~CB(C~6~F~5~)~4~) (2) and triisobutylaluminium (AliBu~3~)/Ph~3~CB(C~6~F~5~)~4~, respectively, as co‐catalyst systems. The ratios of polymerization rates R~p~(rac)/R~p~(meso) were changed with the combined cocatalysts. It was found that in the case of using trialkylaluminium/2 as co‐catalyst R~p~(rac)/R~p~(meso) is lower than when using MAO in any kind of α‐olefin polymerization.