Ziegler-Natta 型催化剂NdCl3·3I-PtOH-AlEt3 两组分间的反应及其反应产物对双稀烃聚合的催化活性

Reactions between two components of a ziegler-natta type catalyst, NdCl3.3i-PrOH and AlEt3, and catalytic activity of the reaction product in the diene polymerization

The reactions between the two components of the rare-earth coordination catalyst, NdCl3.3i-PrOH and AlEt3, were studied. It was found that the activated solid product was a mixture containing alkylated neodymium compounds, but no alkyl chloride was formed during the reaction. The alkyls bounded to neodymium or to the bridge between neodymium and aluminium atoms are thermally less stable than those bonded to the aluminium atom. Two possible structures of alkylated neodymium compounds were postulated. The catalytic activity in the isoprene polymerization increases with the increase of degree of alkylation and decreases in the presence of alkyl aluminium chloride.