Effect of NR/NBR ratio on mechanical properties and crosslink concentration of NR/NBR blend latex film

 
 
 
  • Abstract
  • Keywords
  • References
  • PDF
  • Abstract


    It is a common practice to blend two elastomers of different properties with a view to combine the best properties of each in terms of its technical and economic values. Nitrile rubber (NBR) is blended with natural rubber (NR) to meet the requirements for very good oil resistance as well as high mechanical strength. The former is a polar rubber and provides very good oil resistance, while the latter is non-polar and provides excellent mechanical properties. Numerous works on rubber blends that have been reported are based on dry rubber. On the contrary, the work on rubber blends base on latex received less attention than the dry rubber. This paper describes the work on NR latex and NBR latex blends. NR and NBR were blended at several ratios incorporating NBR up to 50% to study their effect on the mechanical properties and crosslink concentrations. The glass transition temperatures, Tg and the morphology of NR/NBR latex blends were determined to verify the compatibility of the blends.  The results indicated that tensile strength (TS) showed a good linear relationship with loadings of NBR. The decreased in TS with decreased in NR content of the blends was associated with low crosslink concentrations in the rubber blends. Both elongation at break (EB) and tear energy are affected non-linearly by the presence of NBR indicating the incompatibility of the two rubber components.

     

     


  • Keywords


    NR: NBR blends; tensile strength; crosslink concentration; tearing energy; glass transition temperature (Tg)

  • References


      [1] A. Samsuri, “An Introduction to Polymer Science and Rubber Technology”, University Publication Centre (UPENA) (2009), pp. 51-60, 251-260

      [2] D.C.Blackley, “Polymer Latices, Science and Technology Book”, 2nd Edition, Chapman Hall, Volume 1, (1997), Vol.1, pp 53-63,113-125.

      [3] K. Vivayganathan and M.Y. Amir Hasyim, “Natural Rubber and Carboxylated Nitrile-Butadiene Rubber Latex Blends and Evaluation of Coagulant Dipped Film Properties”, 4th International Material Conference & Exhibition, Kuala Lumpur (2004) pp. 175-184.

      [4] S. Azemi, “Tear Behavior of NR Latex Film”, in Proc. International. Rubber Technical Conference. Kuala Lumpur, (1993) pp. 137-156.

      [5] A.R. Ruhida and M.Y. Amir Hashim, “Improving Natural Rubber Latex Film Softening Due to Oil”, Journal of Rubber. Research, Volume 15(2), (2012), pp. 81–95.

      [6] S. H. Botros, A. F. Moustafa, and S. A. Ibrahim, “Improvement of Homogeneity of NR/NBR Rubber Blends”, PMA Rubber Conference (2011), pp. 319-325.

      [7] V.L. Michael, “NR/NBR Blends-Basic Problems and Solutions”, in Chapter 5, Blends of Natural Rubber – Novel Techniques for Blending with Specialty Polymers Book, Springer – Verlag, (1998) pp. 53-67.

      [8] H.Werner”, Rubber Technology Handbook”, Hanser Publisher, Munich, Vienna and New York, (1996), pp. 227.

      [9] N. Moonprasith, K. Suchiva and O. Tongcher, “Blending in Latex Form of Natural Rubber and Nitrile Latices-A Preliminary Study of Morphology and Mechanical Properties”, National Metal and Materials Technology Center, Thailand, (2005), pp. 13.

      [10] J.T. Andrew and K.P. Jones, “Improving The Morphology And Properties Of NR/NBR Blends With Polychloroprene As The Compatibilizing Agent”, Chapter 7, Blends of Natural Rubber-Novel Techniques for Blending with Specialty Polymers Book, Springer-Verlag, (1998), pp. 8-19.

      [11] M.N Ismail, S.H El-Sabbagh and A.A.Yehia, “Fatigue and Mechanical Properties of NR/SBR and NR/NBR Blend Vulcanizates”, Journal of Elastomers and Plastics, Volume 31(3), (1999) pp. 255-270.


 

View

Download

Article ID: 21900
 
DOI: 10.14419/ijet.v7i4.18.21900




Copyright © 2012-2015 Science Publishing Corporation Inc. All rights reserved.