A REINVESTIGATION OF BETA-TICL3 .2. CATALYTIC ACTIVITY IN PROPENE POLYMERIZATION

被引:8
作者
BUSICO, V [1 ]
CORRADINI, P [1 ]
DEMARTINO, L [1 ]
TRIFUOGGI, M [1 ]
机构
[1] NAPLES UNIV,DIPARTIMENTO CHIM,VIA MEZZOCANNONE 4,I-80134 NAPLES,ITALY
关键词
D O I
10.1016/0014-3057(92)90127-N
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The catalytic behaviour in propene polymerization of "preformed" samples of beta(brown) TiCl3 was reinvestigated and compared with that of in situ TiCl4/AlR3 mixtures. Catalyst systems based on beta-TiCl3 produced highly regioregular polypropene samples with microstructures close to those of polymers obtained in the presence of violet TiCl3 [apart from a lower fraction of "highly isotactic" macromolecules (insoluble in boiling heptane)]. On the other hand, catalyst systems originating from the interaction of TiCl4 and an Al-trialkyl in the polymerization medium were found to contain, in addition to a heterogeneous beta-TiCl3 phase, homogeneous Ti species contributing substantially to the polymerization activity and responsible for the formation of a polymer fraction which is rather stereo- and regio-irregular and has low molecular weight.
引用
收藏
页码:519 / 523
页数:5
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