Abstract
The changes in surface microhardness of lamellar polyethylene, as a consequence of annealing treatment, have been investigated. The variations in hardness are interpreted in terms of morphological changes primarily related to the lamellar thickness. In the low temperature range, hardening is related to elimination of crystal defects. In the intermediate annealing range the rapid hardness increase can be associated with a well-defined stacking of lamellae which thicken with increasing temperature. Nearer the melting point the regular good lamellar stacking is destroyed through partial melting and recrystallization, yielding a larger proportion of new thin lamellae which contribute to the drastic hardness depression observed.
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Rueda, D.R., Martinez-Salazar, J. & Baltá-Calleja, F.J. Annealing effects in lamellar linear polyethylene as revealed by microhardness. J Mater Sci 20, 834–838 (1985). https://doi.org/10.1007/BF00585723
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DOI: https://doi.org/10.1007/BF00585723