English Abstract

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

Yoshito OHTAKE *2
Seiichi KAWAHARA *1
*1: Department of Materials Science and Technology Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan.
*2:Chemicals Evaluation and Research Institute, Japan, Sugito-machi, Kitakatsushika-gun, Saitama 345-0043, Japan
Nippon Gomu Kyokaishi,(2011),84(6),176-181 Original Paper in Japanese

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.

Keywords: Polypropylene, Degradation, Residual Chlorine, Antioxidant, Dissolution, Blooming