Natural Rubber/Fluoro Elastomer Blends: Effect of Third Component on Cure Characteristics, Morphology,Mechanical Properties, and Automotive Fuel Swelling

Manisara Phiriyawirut, Thalatchanan Limwongwatthananan, Surawut Kaemram, Sirithada Wiengkaew

Department of Tool and Materials Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand.

DOI: 10.4236/ojpchem.2013.34014                

Abstract

The natural rubber (NR) was mixed with fluoro elastomer (FKM), due to the difference of polarity in NR and FKM made this blend incompatible so the third component was used. NR/FKM blended with the blend ratio of 70/30 was prepared by using a two-roll mill and vulcanization in a compression mold at 180℃ using peroxide as a curative agent. Epoxidized natural rubber (ENR) or polyisoprene-graft-maleic acid monomethyl ester (PI-ME) was used as a third component. The curing characteristics, morphology, mechanical properties, and automotive fuel swelling were investigated. The results indicated that the scorch time and cure time of the blend rubbers were longer as adding ENR or PI-ME. Both mechanical properties and automotive fuel resistance of the blend rubbers were found to increase with adding ENR in rubber blend. Conversely for adding PI-ME, automotive fuel resistance of the blend rubbers was found to decrease progressively with increasing PI-ME content.

Keywords

Natural Rubber; Fluoro Elastomer; Epoxidized Natural Rubber; Blend

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	S. H. EL-Sabbagh, “Compatibility Study of Natural Rubber and Ethylene-propylene-diene Rubber Blends,” Journal of Applied Polymer Science, Vol. 90, No. 1, 2003, pp. 1-11.
[2]	M. Phiriyawirut, “Preparation of Biodiesel Oil Resistance Rubbers from Natural Rubber/Fluoro Elastomer Blends,” Proceeding of the 2nd South East Asian Technical University Consortium (SEATUC) Symposium, Bandung, 2008, pp. 50-55.
[3]	K. G. Karnika de Silva and M. V. Lewan, “Improving the Morphology and Properties of NR/NBR Blends with NR/ PMMA Graft Copolymers,” In: J. Tinker and K. P. Jones, Eds., Blends of Natural Rubber, A. Chapman & Hall, London, 1998, pp. 68-78. http://dx.doi.org/10.1007/978-94-011-4922-8_6
[4]	K. Prakashan, A. K. Gupta and S. N. Maiti, “Effect of Compatibilizer on Micromechanical Deformations and Morphology of Dispersion in PP/PDMS Blend,” Journal of Applied Polymer Science, Vol. 105, No. 5, 2007, pp. 2858-2867. http://dx.doi.org/10.1002/app.26510
[5]	M. N. Radhakrishnan Nair and M. G. Gopinathan Nair, “Compatibility Studied and Characterisation of a PVC/ NR Blend System Using NR/PU Block Copolymer,” Polymer Bulletin, Vol. 56, No. 6, 2006, pp. 619-631. http://dx.doi.org/10.1007/s00289-006-0524-4
[6]	G. Guerrica-Echevarría, J. I. Eguiazábal and J. Nazábal, “Influence of Compatibilization on the Mechanical Behavior of Poly(trimethylene terephthalate)/poly(ethyleneoctene) Blends,” European Polymer Journal, Vol. 43, No. 3, 2007, pp. 1027-1037. http://dx.doi.org/10.1016/j.eurpolymj.2006.11.036
[7]	K. A. Moly, S. S. Bhagawan, G. Groeninckx and S. Thomas, “Correlation between the Morphology and Dynamic Mechanical Properties of Ethylene Vinyl Acetate/Linear Low-Density Polyethylene Blends: Effects of the Blend Ratio and Compatibilization,” Journal of Applied Polymer Science, Vol. 100, No. 6, 2006, pp. 4526-4538. http://dx.doi.org/10.1002/app.22466
[8]	M. Abdul Kader and A. K. Bhowmick, “New Miscible Elastomer Blends from Acrylate Rubber and Fluorocarbon Rubber,” Rubber Chemistry and Technology, Vol. 73, No. 5, 2000, pp. 889-901. http://dx.doi.org/10.5254/1.3547627
[9]	F. W. Barlow, “Rubber Compounding: Principles, Materials, and Techniques,” Marcel Dekker, Inc., New York, 1988.
[10]	Agency for Toxic Substances and Disease Registry (ATSDR), “Toxicological Profile for Fuel Oils,” U.S. Department of Health and Human Services, Public Health Service, 1995.
[11]	M. Phiriyawirut and S. Luamlam, “Influence of Poly(vinyl chloride) on Natural Rubber/Chlorosulfonated Polyethylene Blends,” Open Journal of Organic Polymer Materials, Vol. 3, 2013.