TY - JOUR A1 - Müller, Werner A1 - Jakob, Ines A1 - Tatzky-Gerth, Renate A1 - Wöhlecke, Andreas T1 - A Study on antioxidant depletion and degradation in polyolefin based geosynthetics: sacrificial versus regenerative stabilization T2 - Polymer engineering and science N2 - Plastic products used in geotechnical engineering, so-called geosynthetics, are often made of polyolefins (polyethylene or polypropylene) and stabilized against oxidative degradation by antioxidants (AO). Three types of AO “packages” are used: (P1) phenols and phosphites/sulfides, (P2) hindered amines (HAS) with a marginal stabilization P1 of the basic resin, (P3) a combination of packages P1 and P2 with comparable amounts of phenol and HAS. We report about long-lasting oven aging and water immersion tests at 80 °C of 29 different polyolefin based products (geomembranes, geonets and geotextiles). Pronounced differences in the degradation behavior were found depending solely on the type of AO package. In case of P1, the oxidative degradation is prevented by the AO. Autocatalytic oxidation only begins after depletion of AO and may lead to catastrophic failure depending on the environmental conditions. In case of P2, degradation starts right from the beginning. However, it is decelerated and proceeds gradually. In case of P3, the degradation behavior seems to be a superposition of the characteristics obtained for P1 and P2. Plotting the fractional loss of the AO in P1 and P2 as function of the square root of aging time, we identified two regimes of AO depletion. We suggest to attribute this observation to the different mechanisms of AO depletion. PB - John Wiley & Sons CY - New York KW - Geosynthetics KW - Oxidation KW - Antioxidant KW - Stabilization PY - 2016 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/35630 AN - OPUS4-35630 SN - 0032-3888 VL - 56 IS - 2 SP - 129 EP - 142 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany