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The morphology of nascent polyethylene prepared with the soluble catalyst (C5H5)2TiCl2-R2AlCl

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Summary

Polyethylene was prepared with the solubleZiegler-Natta catalyst bis-(cyclopentadienyl)-titanium dichloride-dialkylaluminum chloride under various polymerization conditions. The morphology and properties of the nascent polymer samples were studied by electron microscopy, fuming nitric acid oxidation and differential scanning calorimetry. The observations show that the polymer has a chain-folded lamellar structure. The morphology of this polymer contrasts with the fibrillar texture of nascent poly(α-olefins) prepared with heterogeneousZiegler-Natta catalysts. It is suggested that inZiegler-Natta polymerizations the morphology of the nascent polymer is determined by the physical state of the catalyst in the polymerization medium.

Zusammenfassung

Polyäthylen wurde unter verschiedenen Polymerisierungsbedingungen mit dem löslichenZiegler-Natta-Katalysator Bis-(cyclopentadienyl)-Titandichlorid-Dialkylaluminiumchlorid hergestellt. Die Morphologie und Eigenschaften der naszierenden Polymerproben (imstatus nascendi) wurden durch Elektronenmikroskopie, Oxidation mit rauchender Salpetersäure und kalorische Messungen untersucht. Die Beobachtungen zeigen, daß die polymere Substanz eine kettengefaltete lamellare Struktur hat. Die Morphologie dieses Polymeren unterscheidet sich von der fibrillaren Textur der naszierenden Poly(α-olefine) die durch heterogeneZiegler-Natta-Katalysatoren hergestellt wurden. Es wird vorgeschlagen, daß man fürZiegler-Natta-Polymerisate die Morphologie durch den physikalischen Zustand des Katalysators im Polymerisierungsmedium imstatus nascendi untersucht.

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  1. T. Georgiadis & R. St. John Manley

    Present address: Department of Chemistry and Pulp and Paper Research Institute, McGill University, Montreal, Canada

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    1. T. Georgiadis
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    2. R. St. John Manley
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    Georgiadis, T., John Manley, R.S. The morphology of nascent polyethylene prepared with the soluble catalyst (C5H5)2TiCl2-R2AlCl. Kolloid-Z.u.Z.Polymere 250, 557–572 (1972). https://doi.org/10.1007/BF01501464

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