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Effect of Cure System on the Life-time of Hydrogenated NBR O-ring using Intermittent Compression Stress Relaxation(CSR)

간헐 압축응력 완화를 이용한 가교 구조가 hydrogenated NBR 오링의 수명에 미치는 영향 연구

  • Lee, Jin-Hyok (Department of Polymer Engineering, Pusan National University) ;
  • Bae, Jong-Woo (Rubber Material Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Kim, Jung-Su (Rubber Material Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Hwang, Tae-Jun (Rubber Material Research Division, Korea Institute of Footwear & Leather Technology) ;
  • Choi, Yu-Seok (Department of Polymer Engineering, Pukyong National University) ;
  • Baek, Kwang-Sae (Elachem Co.) ;
  • Jo, Nam-Ju (Department of Polymer Engineering, Pusan National University)
  • 이진혁 (부산대학교 고분자공학과) ;
  • 배종우 (한국신발피혁연구소 산업소재융합기술센터 고무연구팀) ;
  • 김정수 (한국신발피혁연구소 산업소재융합기술센터 고무연구팀) ;
  • 황태준 (한국신발피혁연구소 산업소재융합기술센터 고무연구팀) ;
  • 최유석 (부경대학교 고분자공학과) ;
  • 백광세 (엘라켐) ;
  • 조남주 (부산대학교 고분자공학과)
  • Received : 2011.03.24
  • Accepted : 2011.05.02
  • Published : 2011.06.30

Abstract

Intermittent CSR testing was used to investigate the degradation of a hydrogenated NBR(HNBR) O-rings, and also the prediction of its life-time. The cure system of HNBR O-ring was controlled as sulfur cure and peroxide cure system. An intermittent CSR jig was designed taking into consideration the O-ring's environment under use. The testing allowed observation of the effects of friction, heat loss, and stress relaxation by the Mullins effect. Degradation of O-rings by thermal aging was observed between 100 and $120^{\circ}C$. In the temperature range of $100-120^{\circ}C$, O-rings showed linear degradation behavior and satisfied the Arrhenius relationship. The activation energy of HNBR-S was about 70.6 kJ/mol. From Arrhenius plots, predicted life-times of HNBR-S O-ring were 31.1 years and 33.7 years for 50% and 40% failure conditions, respectively. In case of HNBR-P, the activation energy was about 72.1kJ/mol, and predicted life-times were 34.0 years and 36.5 years for 50% and 40% failure conditions, respectively. The peroxide cure system showed slower degradation rate and higher activation energy than the sulfur cure system.

References

  1. ISO 11346, "Rubber, vulcanized or thermoplastic - Estimation of life-time and maximum temperature of use" (2004).
  2. ISO 3384, "Rubber, vulcanized or thermoplastic - Determination of stress relaxation in compression at ambient and elevated temperatures" (2005).
  3. R. P. Brown and F. N. B. Bennett, "Compression Stress Relaxation", Polym. Test., 2, 125 (1981). https://doi.org/10.1016/0142-9418(81)90030-1
  4. P. Tuckner, "Compression, Compression stress relaxation test comparisons and development", SAE Technical report 2000-01-0752 (2001).
  5. P. Tuckner, "Compression stress relaxation testing - comparisons, methods, and correlations", SAE Technical report 2001-01-0742 (2001).
  6. S. Ronan, T. Alshuth, S. Jerrams, and N. Murphy, "Long-term stress relaxation prediction for elastomers using the time-temperature superposition method", Mater. Des., 28, 1513 (2007). https://doi.org/10.1016/j.matdes.2006.03.009
  7. K. T. Gillen, M. Celina, and R. Bernstein, "Validation of improved methods for predicting long-term elastomeric seal lifetimes from compression stress-relaxation", Polym. Degrad. Stab., 82, 25 (2003). https://doi.org/10.1016/S0141-3910(03)00159-9
  8. J. H. Lee, J. W. Bae, J. S. Kim, T. J. Hwang, S. D. Park, S. H. Park, Y. T. Min, W. H. Kim, and N. J. Jo, "Life-time Prediction of a FKM O-ring using Intermittent Compression Stress Relaxation (CSR) and Time-temperature Superposition (TTS) Principle", Elastomers and Composites, 45, 263 (2010)
  9. K. T. Gillen, R. Bernstein, and M. Celina, "Non-Arrhenius behavior for oxidative degradation of chlorosulfonated polyethylene materials", Polym. Degrad. Stab., 87, 335 (2005). https://doi.org/10.1016/j.polymdegradstab.2004.09.004
  10. R. W. Ogden and D. G. Roxburgh, "A pseudo-elastic model for the Mullins effect in filled rubber", Proceedings of the Royal Society of London, Series A, 455, 5861 (1999).