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The optical birefringence of injection-moulded polystyrene and polyethylene

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Abstract

Injection-moulded plaques of polystyrene and of two types of high-density polyethylene have been produced under different moulding conditions. Microscopic examination coupled with birefringence measurements on polystyrene and polyethylene show that the plaques contain a flow-induced molecularly ordered structure together with, in the case of polyethylene, a thin (∼4µm) disordered surface layer. Thermal annealing of the polystyrene birefringence and “frozen-in” strain distribution have been measured and interpreted in terms of phenyl group reorientation and molecular rearrangement, respectively.

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  1. J. J. Thomson Physical Laboratory, University of Reading, Whiteknights, Box 220, RG6 2AF, Reading, Berkshire, UK

    B. L. Evans

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Evans, B.L. The optical birefringence of injection-moulded polystyrene and polyethylene. J Mater Sci 24, 3588–3598 (1989). https://doi.org/10.1007/BF02385744

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