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Antioxidant Depletion from Textured Conductive and Non-conductive HDPE Geomembranes in Chlorinated Water

This paper investigates the antioxidant depletion from two multilayered 2.0 mm thick double sided textured, white-surfaced (top side only) high density polyethylene (HDPE) geomembranes using jar immersion tests. Both geomembranes were produced by the same manufacturer from the same nominal resin, but one of the two geomembranes was manufactured with a conductive layer on its black side. The two textured geomembranes had smooth edges and the antioxidant depletion is examined for both the textured and the smooth edges of the rolls to investigate the effect of texturing and conductive layer on the rate of antioxidant depletion. Based on the five months incubation duration in chlorinated water at 85oC, the preliminary results of standard oxidative induction time (Std-OIT) and high pressure oxidative induction time (HP-OIT) tests showed that the OIT depletion of the conductive geomembrane was faster than the non-conductive geomembrane. In addition, the Std-OIT depletion of the two textured geomembranes was faster than their smooth edges.