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“Anisotactic” polypropylenes produced with a zirconocene-methylalumoxane catalyst: solid state properties and microstructure

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Summary

Propene was polymerized with ethylene bis(-1-indenyl)-dichlorozirconium (Et(Ind)2ZrCl2) and methylalumoxane (MAO) at 70°C. The polymer was fractionated by solvent extraction; there was no hexane insoluble material. The pentane insoluble, hexane soluble (C5iC6s) fraction contains 67% mmmm pentads. It has x-ray crystallinity of 59% comprised of 93% γ-phase, and no NMR detectable misinsertions. However, 1,3-insertion was found in the more soluble fractions.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Materials Research Laboratories, University of Massachusetts, 01003, Amherst, MA, USA

    Bernhard Rieger & James C. W. Chien

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  1. Bernhard Rieger
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  2. James C. W. Chien
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Rieger, B., Chien, J.C.W. “Anisotactic” polypropylenes produced with a zirconocene-methylalumoxane catalyst: solid state properties and microstructure. Polymer Bulletin 21, 159–163 (1989). https://doi.org/10.1007/BF00266167

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