The effect was investigated of the addition of different protic compounds, such as water, n-butanol, butanoic acid and methyl ethyl ketone, to triisobutylaluminium used as the cocatalyst for an Hf-Ti bimetallic catalyst supported on magnesium dichloride (Ti1.0Hf1.3Mg2.0Al0.85Cl12.45) in the polymerization of ethylene. All the above compounds show a similar behaviour by decreasing catalyst activity, increasing polymer molecular weight and narrowing polymer molecular weight distribution. Minor differences are observed in the end-group unsaturations. An attempt has been made to correlate these effects to the interaction of hafnium and titanium sites with the reaction products from AlR3 and the different protic compounds.
|Autori:||Ferrero C; Masi F; Menconi F; Barazzoni L; Moalli A; Altomare A; Solaro R; Ciardelli F|
|Titolo:||Effect of protic compounds on ethylene polymerization by Hf-Ti supported catalysts|
|Anno del prodotto:||1993|
|Digital Object Identifier (DOI):||10.1016/0032-3861(93)90484-R|
|Appare nelle tipologie:||1.1 Articolo in rivista|