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Oxidation Behavior of High Strength Chain-Extended Polyethylene Fibers1

The resistance to oxidation of polyethylene fiber intended for engineering applications has been compared with that of conventional polyethylene films. The highly ordered fiber was appreciably more resistant to γ-initiated oxidation and somewhat more resistant to photo-oxidation. Oxidation products from the γ-initiated oxidation were quite highly ordered with respect to the fiber axis as shown by polarized infrared spectroscopy. Photo-oxidation products showed random orientation, possibly as a result of the more extensive chain scission that must accompany the photo-process. Despite the higher resistance of γ-radiation damage of the chain-extended fiber structure as compared to unoriented film, the irradiated fiber did show a slow post-irradiation oxidation.