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Copolymerization of ethylene and non-conjugated dienes with Cp2ZrCl2/MAO catalyst system by P Pietikäinen; T Väänänen; J.V Seppälä is a Materials Science article available to read on EtoBox.

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Ethylene was copolymerized with linear, non-conjugated dienes by the metallocene catalyst system Cp 2 ZrCl 2 / MAO at 908C. The dienes were 1,5-hexadiene (HD), 1,7-octadiene (OD) and 7-methyl-1,6-octadiene (MOD). Incorporation of the dienes was studied by 1 H and 13 C±NMR and FTIR. According to the results, HD formed only ®ve-member rings to polyethylene, even though selectivity towards cyclization has been reported to decrease when HD concentration in the reactor increases over 50 mol%. OD and MOD were incorporated by 1,2-addition forming branches to the copolymer. The conversion of MOD remained under 4%, and was noticeably lower than that of HD and OD (25±40%). However, the eect of MOD on the physical properties of the copolymer was signi®cant, whereas HD addition had almost no eect on the molar mass. The conversion of all dienes decreased when the diene concentration in the reactor was increased.

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Author

P Pietikäinen; T Väänänen; J.V Seppälä

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)