Ziegler‐type polyethylene

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Abstract
An account is given of the production, structure and properties of polyethylene made by the Ziegler process, by which polymers in a wide range of molecular weight and density can be produced.The choice of catalyst combination of aluminium alkyl and transition metal halide (e.g. TiCl4) is discussed and factors affecting rate of polymerisation, density and average molecular weight are considered.Results are given for molecular weight distribution and the nature of the residual unsaturated groups is described.Curves relating various physical and mechanical properties are presented, the results of accelerated light‐stability tests are given and changes in properties with degradation are illustrated.