Steven Horwatt, Randall Duderstadt, Douglas Keller, Sameer Mehta
Papers # 2014 Chicago
The development of an antioxidant package for potential use in chlorine resistance of polyethylene pipe is a timeintensive exercise. Previous studies have shown that simple bench top experiments in the solution phase, coupled with LC-MS as a rapid tool for evaluating the analysis of antioxidant reaction products after exposure to a bleach solution could be an effective tool in the development of chlorine resistant antioxidant packages for polyethylene. This paper presents examples of how this rapid LC-MS technique can be applied to the development of enhanced chlorine resistant antioxidant packages for polyethylene. Results are shown for both individual antioxidants as well as binary antioxidant mixtures. The results of the rapid LC-MS method are also compared to results obtained by the more standard protocol of monitoring the OIT and resin property retention of molded samples of polyethylene exposed to bleach solutions. Results of both the rapid LC-MS and standard OIT retention techniques are also compared to the single point validation testing method of potable water compound categorization as described in PPI TN-43/2014.