Article

Polymer Bulletin

, Volume 54, Issue 1, pp 141-145

Study of local oxidative degradation in polypropylene impact copolymer by energy dispersive X-ray system

  • Norio ManabeAffiliated withResearch and Evaluation Center, Sumitomo Wiring Systems Co., Ltd.
  • , Yoshimitsu YokotaAffiliated withResearch and Evaluation Center, Sumitomo Wiring Systems Co., Ltd.
  • , Hisayuki NakataniAffiliated withDepartment of Bioengineering and Chemistry, College of Environmental Engineering and Architecture, Kanazawa Institute of Technology Email author 
  • , Shoutarou SuzukiAffiliated withSchool of Materials, Science Japan Advanced Institute of Science and Technology
  • , Liu BopingAffiliated withSchool of Materials, Science Japan Advanced Institute of Science and Technology
  • , Minoru TeranoAffiliated withSchool of Materials, Science Japan Advanced Institute of Science and Technology

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Summary

In this study, the thermal oxidative degradation of a polypropylene (PP) impact copolymer was examined using a transmission electron microscope equipped with an energy dispersive X-ray system (TEM/EDX). The oxidative behavior was visually captured by oxygen line analysis. The oxidation resistance of the ethylene-propylene rubber (EPR) phase was considerably higher than that of the PP matrix, indicating that the degradation behavior of the PP impact copolymer was heterogeneous. It was found that the higher resistance of the EPR phase originated from its primary structure by 13C-NMR measurement.