Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Characterization of Chlorinated NR using Pyrolytic Technique

  • Received : 2020.08.20
  • Accepted : 2020.09.07
  • Published : 2020.12.31
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Abstract

Vehicle wiper blades are typically treated with chlorine to lower their friction coefficient with the windshield surface. In this study, a chlorinated, natural rubber (NR) vehicle wiper blade was characterized using a pyrolytic technique. Unchlorinated and chlorinated wiper blades were pyrolyzed and the pyrolysis products were analyzed using gas chromatography/mass spectrometry (GC/MS). Besides isoprene and dipentene, the other principal pyrolysis products such as 1,5,8-p-menthatriene (MTT) and p,α-dimethylstyrene (DMS) were observed. The MTT and DMS ratios did not vary for the chlorinated nor unchlorinated samples when the entire rubber lip of the wiper blade was pyrolyzed. However, when only the lip surface of the wiper blade rubber was pyrolyzed (via scratching with a knife) the relative ratios of the chlorinated sample were much greater than those of the unchlorinated sample. As MTT is produced from the conjugated backbone of chlorinated NR that forms through HCl elimination during initial pyrolysis, and DMS is generated by the dehydrogenation of MTT, these two products could be used as markers for detecting chlorinated NR.

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References

  1. S. B. Rho, M. A. Lim, J. K. Park, and J. I. Son, "The characteristics of wiper blade rubber with surface treatments", Elastomer, 33, 27 (1998).
  2. S.-B. Rho, "The surface characteristics of chlorinated wiper blade rubber using EPMA", J. Kor. Acad. Ind. Coop. Soc., 15, 3292 (2014). https://doi.org/10.5762/KAIS.2014.15.5.3292
  3. W. Klysubun, S. Thanawan, P. Thamasirianunt, S. Radabutra, and P. Sombunchoo, "Determination of chlorine content in chlorinated, vulcanized natural rubber by XANES", Nucl. Instrum. Methods Phys. Res. A, 582, 242 (2007). https://doi.org/10.1016/j.nima.2007.08.117
  4. C. W. Extrand and A. N. Gent, "Contact angle and spectroscopic studies of chlorinated and unchlorinated natural rubber surfaces", Rubber Chem. Technol., 61, 668 (1988).
  5. C. C. Ho and M. C. Khew, "Surface characterization of chlorinated unvulcanised natural rubber latex films", Int. J. Adhes. Adhes., 19, 387 (1999). https://doi.org/10.1016/S0143-7496(98)00067-0
  6. J. Mcgavack, "Substitution and addition of chlorine to the rubber molecule", Ind. Eng. Chem., 15, 961 (1923). https://doi.org/10.1021/ie50165a044
  7. D. Lenko, S. Schlogl, R. Kramer, W. Kern, R. Schaller, and A. Holzner, "Contributions to the characterization of chlorinated polyisoprene surfaces", Macromol. Symp., 311, 9 (2012). https://doi.org/10.1002/masy.201000136
  8. S.-S. Choi and H.-M. Kwon, "Characterization of pyrolysis products formed from styrene-1,2-unit heterosequence of styrene-butadiene copolymer", J. Anal. Appl. Pyrolysis, 99, 1 (2013). https://doi.org/10.1016/j.jaap.2012.11.014
  9. S.-S. Choi and D.-H. Han, "Pyrolysis behaviors of poly(acrylonitrile-co-butadiene) with differing microstructures", J. Anal. Appl. Pyrolysis, 80, 53 (2007). https://doi.org/10.1016/j.jaap.2006.12.032
  10. S.-S. Choi and E. Kim, "Analysis of pyrolysis products of ethylene-vinyl acetate copolymer (EVA) using pre-deacetylation", J. Anal. Appl. Pyrolysis, 217, 1 (2017).
  11. S.-S. Choi, "Correlation of crosslink density with pyrolysis pattern of natural rubber vulcanizates with efficient vulcanizing cure system", J. Anal. Appl. Pyrolysis., 52, 105 (1999). https://doi.org/10.1016/S0165-2370(99)00041-8