ISSN:
0887-624X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The previous paper in this series described several catalytic systems which can be used for simultaneous ethylene dimerization to 1-butene and copolymerization of the in situ-formed olefin with ethylene to form branched polyethylene. Such catalytic systems allow the synthesis of linear low-density polyethylene from a single monomer source. This article presents a more detailed description of one of the dual-functional catalyst systems studied, a mixed homogeneous-heterogeneous Ziegler-Natta catalyst, Al(C2H2)3-Ti(Oi-C3H7)4-TiCl4/MgCl2/polyethylene, at 90°C. Discussed are kinetics of ethylene dimerization with the soluble component, Al(C2H5)3-Ti(Oi-C3H7)4, and the effects of aluminum alkoxides on the system. Addition of the ethylene dimerization catalyst to the solid component, Al(C2H5)3-TiCl4/MgCl2/polyethylene, results in a partial decrease in polymerization activity. Some of the decrease can be attributed to the presence of 1-butene in the reaction medium. Measurement of the reactivity ratio kEE/kEB for two catalytic systems, the solid component and the title dual-functional catalyst, demonstrated that the presence of the dimerization component results in a twofold increase in the reactivity ratio, from 20 to ca. 40.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1986.080240601
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