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Use of polypropylene products in tap water decreases its lifetime as compared to in the air. The reason is that antioxidants, which determine polymers' lifetime, dissolve into water rapidly and polypropylene products become easy to deteriorate. Especially, when water contains residual chlorine, polypropylene products generate carbonyl group which shows the oxidation degradation on its surface and this leads to the strength degradation.

Dissolution Behavior of the Antioxidant in PP in Tap Water and Evaluation of the Polymer Degradation