화학공학소재연구정보센터
Macromolecular Research, Vol.16, No.6, 561-566, August, 2008
Influence of the Cure Systems on Long Time Thermal Aging Behaviors of NR Composites
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NR composites with different curing systems were aged thermally at 60, 70, 80, and 90 ℃ for 2-185 days in a convection oven, and the changes in the crosslink density were investigated as a function of the accelerated thermal aging. The overall crosslink densities increased with increasing aging time irrespective of the aging temperatures and curing systems. The changes in crosslink density were enhanced by increasing the aging temperature. The degree of the increased crosslink density was in the following order: “the conventional cure system > the semi-EV system > the EV system”. For short term thermal aging, the change in crosslink density with the aging time was complicated, particularly for low temperature aging. The activation energies of the change in crosslink density with thermal aging using the conventional and semi-EV cure systems increased and then remained relatively constant with increasing aging time, whereas that of the specimen with an EV cure system tended to increase linearly. The experimental results were explained by the dissociation of the existing polysulfidic linkages and the formation of new crosslinks through the crosslinking-related chemicals remaining in the sample.
  1. Choi SS, Ko JE, Macromol. Res., 15(5), 482 (2007)
  2. Kim MS, Kim JH, Kim JK, Kim SJ, Macromol. Res., 15(4), 315 (2007)
  3. Krejsa MR, Koenig JL, Rubber Chem. Technol., 66, 3786 (1993)
  4. Chakraborty SK, Bhowmick AK, De SK, J. Macromol. Sci. -Rev. Macromol. Chem. C, 21, 313 (1981)
  5. van Duin M, Souphanthong A, Rubber Chem. Technol., 68, 717 (1995)
  6. Morrison NJ, Porter M, Rubber Chem. Technol., 57, 63 (1984)
  7. Chen CH, Koenig JL, Shelton JR, Collins EA, Rubber Chem. Technol., 54, 734 (1981)
  8. Choi SS, Korea Polym. J., 5(1), 39 (1997)
  9. Layer RW, Rubber Chem. Technol., 65, 211 (1992)
  10. Lautenschlaeger FK, Zeeman P, Rubber Chem. Technol., 52, 1030 (1979)
  11. Layer RW, in Proceedings of Rubber Division 128th Meeting, American Chemical Society, Paper No. 112 (1985)
  12. Ferrandino MP, Saanders JA, Hong SW, in Proceedings of Rubber Division 147th Meeting, American Chemical Society, Paper No. 29 (1995)
  13. Choi SS, Nah C, Jo BW, Polym. Int., 52, 1382 (2003)
  14. Brown RP, Butler T, Natural ageing of rubber. Changes in physical properties over 40 years, RAPRA Technology Ltd (2000)
  15. Brown RP, Butler T, Hawley SW, Ageing of rubber. Accelerated heat ageing test results, RAPRA Technology Ltd (2001)
  16. Choi SS, Bull. Kor. Chem. Soc., 21, 628 (2000)
  17. Choi SS, Kim JC, Woo CS, Bull. Korean Chem. Soc., 27, 936 (2006)