Iranian Journal of Polymer Science and Technology

Iranian Journal of Polymer Science and Technology

Effect of Irradiated Poly(tetrafluoroethylene) Additive on Mechanical and Tribological Properties in Nitrile Rubber Composites

Document Type : Research Paper

Authors
Farid Jafari 1
Seyed Mostaffa Hosseini 1
Mehdi Razzaghi-Kashani 1
Mohammad Reza Pourhossaini 2
1 Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Iran
2 Composite Research Center, Material Science and Manufacturing Technologies, Malek Ashtar University of Technology, P.O. Box 15875-1774, Tehran, Iran
10.22063/jipst.2019.1681
Abstract
Hypothesis: Poly(tetrafluoroethylene) (PTFE) powder, due to its low surface energy, reduces the friction of nitrile rubber (NBR) composite. Moreover, due to its chemical stability PTFE improves the resistance of the composite to oil solvents. Due to thermal stability, it can improve thermal resistance of rubber compound. However, the dispersion of PTFE particles in the rubbery matrix is limited and the latter may reduce in mechanical properties.
Methods: To create better polymer-filler interactions and improve the dispersion of rubber, the type of irradiated PTFE powder was used. Samples were prepared and evaluated well by melt mixing.
Findings: Distribution and dispersion of irradiated PTFE powder particles are suitable for filled samples. The irradiated PTFE powder not only does not endanger the sulfur curing of nitrile rubber compounds reinforced with carbon black, but also improves the Young's modulus and hardness of the samples. Thus, contrary to the references, irradiated PTFE powder, probably by affecting the reduction in the energy level of rubber compounds, could significantly reduce the friction coefficient and improve tribological properties. So that, with a reduction of mechanical strength about 4-5%, for 20 phr loading of the lubricant, under the test conditions the reduction in friction coefficient was 40%. For the aging properties, a small change in the strength-at-break was obtained after solvent conditioning and under its thermal aging a very small reduction in the strength-at-break was obtained for compounds. For a composite containing 20 phr of PTFE, about 7% decrease in strength and strain-at-break was observed after thermal aging and about 8.5% improvement after solvent aging.

Keywords
nitrile rubber (NBR)
friction
lubrication
irradiated polytetrafluoroethylene (PTFE)
carbon black
  1. Khan M.S., Lehmann D., Heinrich G., and Franke R., Tribological Study of Peroxide-Cured Epdm Rubber Filled with Electron Beam Irradiated PTFE Powder, Wear, 266, 200-207, 2009.
  2. Khan M.S., Franke R., Gohs U., Lehmann D., and Heinrich G., Friction and Wear Behaviour of Electron Beam Modified PTFE Filled EPDM Compounds, Wear, 266, 175-183, 2009.
  3. Khan M.S., Franke R., Lehmann D., and Heinrich G., Physical and Tribological Properties of PTFE Micropowder-Filled EPDM Rubber, Tribol. Int., 42, 890-896, 2009.
  4. Heinrich G., Advanced Rubber Composites, Springer Science and Business Media, 2011.
  5. Faramarzi I. and Razzaghi-Kashani M., Improvements in Tribological Properties of Polyamide 6 by Application of Aramid Pulp, Iran. Polym. J., 24, 329-335, 2015.
  6. Khan M., Friction, Wear and Mechanical Properties of Electron Beam Modified PTFE-Based Rubber Compounds,  Wear, 266, 175-183, 2009.
  7. Khan M.S., Lehmann D., and Heinrich G., Newly Developed Chloroprene Rubber Composites Based on Electron-Modified Polytetrafluoroethylene Powder, Acta Mater., 57, 4882-4890, 2009.
  8. Hosseini S.M. and Razzaghi-Kashani M., On the Role of Nano-Silica in the Kinetics of Peroxide Vulcanization of Ethylene Propylene Diene Rubber, Polymer, 133, 8-19, 2017.
  9. Dluzneski P.R., Peroxide Vulcanization of Elastomers, Rubber Chem. Technol., 74, 451-492, 2001.
  10. Luo K., Zheng W., Zhao X., Wang X., and Wu S., Effects of Antioxidant Functionalized Silica on Reinforcement and Anti-Aging for Solution-Polymerized Styrene Butadiene Rubber: Experimental and Molecular Simulation Study, Mater. Des., 154, 312-325, 2018.
  11. Qian Y.H., Xiao H.Z., Nie M. H., Zhao Y.H., Luo Y.B., and Gong S.L., Lifetime Prediction and Aging Behaviors of Nitrile Butadiene Rubber under Operating Environment of Transformer, J. Electr. Eng. Technol., 13, 918-927, 2018.
  12. Kashani M.R., Behazin E., and Fakhar A., Construction and Evaluation of a New Tribometer for Polymers, Polym. Test., 30, 271-276, 2011.
  13. Sepehri A., Razzaghi-Kashani M., and Ghoreishy M., Vulcanization Kinetics of Butyl Rubber–Clay Nanocomposites and Its Dependence on Clay Microstructure, J. Appl. Polym. Sci., 125, 2012.
  14. Tadmor Z. and Gogos C.G. Principles of Polymer Processing, John Wiley and Sons, 2013.
  15. Hosseini S.M. and Razzaghi-Kashani M., Vulcanization Kinetics of Nano-Silica Filled Styrene Butadiene Rubber, Polymer, 55, 6426-6434, 2014.
  16. Hosseini S.M. and Razzaghi-Kashani M., Catalytic and Networking Effects of Carbon Black on the Kinetics and Conversion of Sulfur Vulcanization in Styrene Butadiene Rubber, Soft Matter., 14, 9194-9208, 2018.
  17. Hosseini S.M. and Razzaghi-Kashani M., On the Mechanism of Physical Effects of Reinforcing Fillers in the Vulcanization Kinetics of Styrene-Butadiene-Rubber, Iran. J. Polym. Sci. Technol. (Persian), 31, 447-460, 2018.
  18. Hosseini S.M., Torbati-Fard N., and Kiyani H., and Razzaghi-Kashani M., Comparative Role of Interface in Reinforcing Mechanisms of Nano Silica Modified by Silanes and Liquid Rubber in SBR Composites, J. Polym. Res., 23, 203, 2016.
  19. Klüppel M., The Role of Disorder in Filler Reinforcement of Elastomers on Various Length Scales, Filler-Reinforced Elastomers/Sanning Force Microscopy, Springer, Berlin, 1-86, 2003
  20. Fröhlich J., Niedermeier W., and Luginsland H.D., The Effect of Filler–Filler and Filler–Elastomer Interaction on Rubber Reinforcement, Compos. Part A: Appl. Sci. Manuf., 36, 449-460, 2005.
  21. Litvinov V., Orza R., Kluppel M., Van Duin M., and Magusin P., Rubber–Filler Interactions and Network Structure in Relation to Stress–Strain Behavior of Vulcanized, Carbon Black Filled EPDM, Macromolecules, 44, 4887-4900, 2011.
  22. Mujtaba A., Keller M., Ilisch S., Radusch H.J., Beiner M., Thurn-Albrecht T., Saalwächter K., Detection of Surface-Immobilized Components and Their Role in Viscoelastic Reinforcement of Rubber–Silica Nanocomposites, ACS Macro Lett., 3, 481-485, 2014.
  23. Mujtaba A., Keller M., Ilisch S., Radusch H.J., Thurn-Albrecht T., Saalwachter K., and Beiner M., Mechanical Properties and Cross-Link Density of Styrene–Butadiene Model Composites Containing Fillers with Bimodal Particle Size Distribution, Macromolecules, 45, 6504-6515, 2012.
  24. Akiba M.and Hashim A., Vulcanization and Crosslinking in Elastomers, Prog. Polym. Sci., 22, 475-521, 1997.
  25. Salgueiro W., Somozaa A., Marzocca A., Consolati G., and Quasso F., Evolution of the Crosslink Structure in the Elastomers NR and SBR, Radiat. Phys. Chem., 76, 142-145, 2007.

 

Iranian Journal of Polymer Science and Technology
Volume 32, Issue 4 - Serial Number 162
November and December 2019
Pages 339-348