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    Ultrasonic and thermal properties of γ-irradiated low-density polyethylene

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    Date
    1993
    Author
    Zahran, R. R.
    Kandeil, A. Y.
    Higazy, A. A.
    Kassem, M. E.
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    Abstract
    The ultrasonic pulse-echo technique and differential thermal analysis were utilized to characterize and to monitor the effect of ?-irradiation on the sonic modulus and the heat effect of low-density polyethylene. The sonic wave velocity, sonic modulus, and specific gravity exhibit a minimum for samples irradiated at 10 Mrad. A minimum in the heat capacity was observed at 1 Mrad. The estimated relative change of the activation energy of ordering exhibits a minimum at 100 Mrad. Below 10 Mrad, the perturbation and the loss of the crystalline phase override the effect of radiation cross-linking. From 10 to 100 Mrad, the effect of cross-linking as well as that of crystallinity are prevailing. Oxidative degradation is dominating above 100 Mrad.
    DOI/handle
    http://dx.doi.org/10.1002/app.1993.070490718
    http://hdl.handle.net/10576/3639
    Collections
    • Chemical Engineering [‎1195‎ items ]

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