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Life Time Prediction and Physical Properties of Chloroprene Rubber Aged by Seawater

클로로프렌 고무의 해수에 의한 물성 변화 및 노화 수명 예측

  • Lee, Chan Koo (Department of Chemical Engineering, Inha University) ;
  • Yun, Ju Ho (Enviromental Materials & Components R&D Center, Korea Automotive Technology Institute) ;
  • Kim, Il (The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of Polymer Science and Engineering, Pusan National University) ;
  • Shim, Sang Eun (Department of Chemical Engineering, Inha University)
  • 이찬구 (인하대학교 화학공학과) ;
  • 윤주호 (자동차부품연구원) ;
  • 김일 (부산대학교 고분자공학과) ;
  • 심상은 (인하대학교 화학공학과)
  • Published : 2012.03.31

Abstract

Herein, life time prediction based on the deterioration of physical properties of chloroprene rubber (CR)aged by heat and seawater was performed. CR samples were experienced an accelerated test at $80^{\circ}C$, $100^{\circ}C$, $120^{\circ}C$ for heat aging, and $40^{\circ}C$, $60^{\circ}C$, $80^{\circ}C$ for seawater aging for 20,000 hrs. The change in tensile strength, maximum elongation,hardness was measured. As a result, the decrease in elongation was a major factor causing failure. The life time estimated using an Arrhenius model was 125 years at $23^{\circ}C$ for thermal aging and 9 years at $23^{\circ}C$ for seawater aging. SEM and elemental analysis reveal that cracks were generated and the content of oxygen was increased for CR agined by seawater. FT-IR spectrum shows the new C-O and C = O bonds were generated by the chemical reaction with seawater. Also, the glass transtion temperature was increased and the thermal decomposition was decreased by seawater aging.

Acknowledgement

Supported by : 지식경제부