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artículo con referato
"Infrared spectroscopy analysis of physico-chemical modifications induced by heavy ions in ultra-high molecular weight polyethylene"
V.C. Chappa, M.F. del Grosso, G. García-Bermúdez and R.O. Mazzei
Nucl. Instrum. Meth. B 243(1) (2006) 58-62
Structural analysis with infrared spectroscopy was carried out on ultra-high molecular weight polyethylene (UHMWPE). The polyethylene was irradiated using Li, C, N, S and I heavy ion beams with different fluences. The analysis showed that the absorbance of the C==C stretching vibration from trans-vinylene groups containing hydroperoxides presents a maximum at certain ion fluence and is correlated with the ion stopping power. The results were analyzed by a Monte Carlo simulation program that models the irradiation process from a geometrical point of view, in which the latent tracks consist in a central core zone surrounded by a larger perturbed region. This study suggests that it is possible to estimate the core dimension from absorbance measurements as a function of fluence. A possible relationship between this C==C structure with the cross-link of two polymeric chains is discussed.
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