Influence of filler network on thermo-chemical de-vulcanization efficiency of carbon black filled natural rubber

Authors

  • Anuwat Worlee Faculty of Science and Technology, Prince of Songkla University
  • Sitisaiyidah Saiwari Faculty of Science and Technology, Prince of Songkla University
  • Wilma Dierkes Department of Elastomer Technology and Engineering, University of Twente
  • Siti Salina Sarkawi Rubber Research Institute of Malaysia, Malaysian Rubber Board
  • Charoen Nakason Faculty of Science and Industrial Technology, Prince of Songkla University

Keywords:

Filler network, Carbon black, Natural rubber, Rubber Recycling

Abstract

Carbon black is often used as the reinforcing filler in tires since it plays an important role in improvement of tires mechanical properties such as abrasion, stiffness, modulus and fatigue life. In this study, natural rubber (NR) filled with various loadings of carbon black was prepared. Then, the NR vulcanizates were de-vulcanized via thermo-chemical method using diphenyl disulfide as de-vulcanization aid. The de-vulcanization efficiency was analyzed by relationship between sol fraction and crosslink density of the de-vulcanizates. It is found that the de-vulcanization efficiency is influenced by filler loading. This is attributed to the degree of filler network formation in a rubber matrix which is depended on the filler loadings. In the unfilled de-vulcanizates the results showed that almost 100% of sol fraction and the crosslink density reduced to almost zero are observed. Adding carbon black results in a decrease of sol fraction and increase of crosslink densities. This is due to during de-vulcanization some occurred reactive radicals reacted with active site of carbon black surfaces in filler network to form gels of complex compound. Hence, the de-vulcanization efficiency is lower with increasing carbon black loadings.

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Author Biographies

Anuwat Worlee, Faculty of Science and Technology, Prince of Songkla University

Department of Rubber Technology and Polymer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani Campus, Pattani  94000, Thailand

Wilma Dierkes, Department of Elastomer Technology and Engineering, University of Twente

Department of Elastomer Technology and Engineering, University of Twente,

7500AE Enschede, The Netherlands

Siti Salina Sarkawi, Rubber Research Institute of Malaysia, Malaysian Rubber Board

Rubber Research Institute of Malaysia, Malaysian Rubber Board, P.O. Box 10150, 50908 Kuala Lumpur, Malaysia

Charoen Nakason, Faculty of Science and Industrial Technology, Prince of Songkla University

Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Surat Thani 84000, Thailand,

References

O. Grigoryeva, A. Fainleib, O. Starostenko, I. Danilenko, N. Kozak, amd G. Dudarenko, “Ground tire rubber (GTR) reclamation: virgin rubber/reclaimed GTR (RE) vulcanizates,” Rubber chemistry and technology, vol. 77, no. 1, pp. 131-146, 2004.

C. S. L. Baker and I. R. Wallance, “Natural rubber truck tyre compounds for improved wear performance,” Journal of Natural Rubber Research, vol. 1, no. 4, pp. 270-285, 1986.

D.R. Paul and S. Newman, Polymer blends. New York: Academic Press, Inc., 1978.

J-B. Donnet and A. Voet, Carbon black, physics, chemistry and elastomer reinforcement. New York: Marcel Dekker, Inc., 1976

Y. Fukahori, “New progress in the theory and model of carbon black reinforcement of elastomers,” Journal of Apply Polymer Science, vol. 95, pp. 66-67, 2005.

E. Demirhan, F. Kandemirli, and M. Kandemirli, “The effect of furnace carbon blacks on the mechanical and the rheological properties of SBR 1502 styrene butadiene rubber,” Materials and Design, vol. 28, pp. 1326-1329, 2007.

H. H. Hassan, E. Ateia, N. A. Darwish, S. F. Halim, and A. K. Abd El-Aziz, “Effect of filler concentration on the physic-mechanical properties of super abrasion furnace black and silica loaded styrene butadiene rubber,” Materials and Design, vol. 34, pp. 533-540, 2012.

B. P. Sahoo, K. Naskar, and D. Kumar, “Conductive carbon black-filled ethylene acrylic elastomer vulcanizates: Physicomechanical, thermal, and electrical properties,” Journal of Materials Science, vol. 47, no. 5, pp. 2421-2433, 2012.

P. J. Flory and J. Rehner, “Statistical mechanics of crosslinked polymer networks II. Swelling,” The Journal of Chemical Physics, vol. 11, pp. 521-526. 1943.

G. Kraus, “Swelling of filler-reinforced vulcanizates,” Journal of Applied Polymer Science, vol. 7, pp. 861-871, 1963.

M. M. Horikx, “Chain scissions in a polymer network,” Journal of Polymer Science, vol. 19, pp. 445-454, 1956.

M. A. L. Verbruggen, L. van der Does, J. W. M. Noordermeer, M. van Duin, and H.J. Manuel, “Mechaisms involved in the recycling of NR and EPDM,” Rubber chemistry and technology, vol. 72, pp. 731-740, 1999.

J. Frohlich, W. Niedermeier, and H-D. Luginsland, “The effect of filler-filler and filler-elastomer interaction on rubber reinforcement,” Composites: Part A: Applied Science and Manufacturing,

P. J. Flory and J. Am, “Molecular size distribution in three dimensional polymers. III. Tetrafunctional brancing units,” Journal of the American Chemical Society, vol. 63, pp. 3096- 31000, 1941.

S. Saiwari, “Post-consumer tires back into new tires, De-vulcanization and re-utilization of passerger car,” Ph.D. Thesis, University of Twente, pp. 90, 2013.

B. Sripornsawat, A. Saiwari, S. Pichaiyut, and C. Nakason, “Influence of ground tire rubber devulcanization conditions on properties of its thermoplastic vulcanizate blends with copolyester,” European Polymer Journal, vol. 85, pp. 279-297, 2016. vol. 36, no. 4, pp. 449-460, 2005.

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Published

2019-09-30

How to Cite

[1]
A. Worlee, S. Saiwari, W. Dierkes, S. S. Sarkawi, and C. Nakason, “Influence of filler network on thermo-chemical de-vulcanization efficiency of carbon black filled natural rubber”, J Met Mater Miner, vol. 29, no. 3, Sep. 2019.

Issue

Vol. 29 No. 3 (2019)

Section

Original Research Articles

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