Changes in mechanical properties due to gamma irradiation of high-density polyethylene (HDPE)

AUTOR(ES)

Cota, S. S., Vasconcelos, V., Senne Jr., M., Carvalho, L. L., Rezende, D. B., Côrrea, R. F.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2007-06

RESUMO

This paper presents an experimental analysis of the effect of dose and dose rate parameters during gamma irradiation of high-density polyethylene (HDPE) samples. Considerations concerning the influence of these parameters on HDPE mechanical strength properties as a result of the predominance of oxidative degradation or of cross-linking are presented. The experimental results show an improvement of HDPE mechanical strength as dose increases, indicating the predominance of cross-linking over oxidative degradation and that lower doses are necessary to obtain a similar change in resistance parameters when radiation is applied at lower dose rates, showing that gamma radiation affects the HDPE in a more efficient way at lower dose rates.

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