Journal of Rubber Research

, Volume 20, Issue 1, pp 33–42 | Cite as

Effect of Molybdenum on Stability of Natural Rubber Latex

  • H. Liu
  • Q. Wang
  • Y. Liu
  • D. He
  • X. Gao
  • H. YuEmail author


The molybdenum contents of natural rubber (NR) latices from five clones of Hevea brasiliensis were determined and ammonium molybdate solutions were added into concentrated NR latex to evaluate the effects of molybdenum ions on the colloid stability of NR latex. Molybdenum ions in NR latex decreased the mechanical stability time (MST) to 682s from 703s even though the molybdenum loading was as low as 0.02 mg/kg and standing one day. The ζ potential of NR latex was reduced to 38 mv from 43 mv when the molybdenum loading was 0.16 mg/kg and standing 30 days. The average size of NR particles was reduced after adding molybdenum ions into NR latex. The adding molybdenum ions in NR latex increased the crosslinking density of vulcanised latex films to 9.86×10−5 mol/cm3 × from 9.2×10−5 mol/cm3. Molecular mass between adjacent crosslink points was decreased to 9.64 kg/mol from 10.47 kg/mol. When the loading of Mo ions is 0.16 mg/kg, the tensile strength of vulcanised latex film was increased to 26.73 MPa which was about 1.76 MPa higher than that of the control sample but it exhibits a negative influence on the antioxidative behaviour of vulcanised latex films.


NR latex molybdenum mechanical stability crosslinking density mechanical properties 


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  1. 1.
    JACOB, J., D’AUZAC, J. AND PREVOT, J. (1993) The Composition of Natural Latex from Hevea brasiliensis. Clin. Rev. Allerg., 11(3), 325–337.Google Scholar
  2. 2.
    SANSATSADEEKUL, J., SAKDAPIPANICH, J. AND ROJRUTHAI, P. (2011) Characterization of Associated Proteins and Phospholipids in Natural Rubber Latex. J. Biosci. Bioeng., 111(6), 628–634.CrossRefGoogle Scholar
  3. 3.
    NAWAMAWATA, K., SAKDAPIPANICH, J.T. AND HO, C.C. (2011) Surface Nanostructure of Hevea brasiliensis Natural Rubber Latex Particles. Colloid. Surface. A., 390(1), 157–166.CrossRefGoogle Scholar
  4. 4.
    O, C.C., KONDO, T., MURAMATSU AND OHSHIMA, N.H. (1996) Surface Structure of Natural Rubber Latex Particles from Electrophoretic Mobility Data. J. Colloid Interf Sci., 178(2), 442–445.CrossRefGoogle Scholar
  5. 5.
    KARUNANAYAKE, L. AND PRIYANTHI PERERA, G.M. (2006) Effect of Magnesium and Phosphate Ions on the Stability of Natural Rubber Latex-Dipped Products. J. Appl. Polym. Sci, 99(6), 3120–3124.CrossRefGoogle Scholar
  6. 6.
    KAWAHARA, S., KAKUBO, T. AND SAKDAPIPANICH, J.T. (2000) Characterization of Fatty Acids Linked to Natural Rubber-Role of Linked Fatty Acids on Crystallization of the Rubber. Polymer, 41(20), 7483–7488.CrossRefGoogle Scholar
  7. 7.
    POEHLE, S., SCHMIDT, K. AND KOSCHINSKY, A. (2015) Determination of Ti, Zr, Nb, V, W and Mo in Seawater by A New Online-Preconcentration Method and Subsequent ICP-MS Analysis. Deep-Sea Res. Pt. I., 98, 83–93.CrossRefGoogle Scholar
  8. 8.
    MALINOVSKY, D., RODUSHKIN, I., BAXTER, D.C., INGRI, J. AND OHLANDER, B. (2005) Molybdenum Isotope Ratio Measurements on Geological Samples By MC-ICPMS. Int. J. Mass. Spectrom., 245(1-3), 94–107.CrossRefGoogle Scholar
  9. 9.
    LU, Y, MAKISHIMA, A. AND NAKAMURA, E. (2007) Coprecipitation of Ti, Mo, Sn and Sb with Fluorides and Application to Determination of B, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta by ICP-MS. Chem. Geol, 236(1-2), 13–26.CrossRefGoogle Scholar
  10. 10.
    OOI, Z.X., ISMAIL, H. AND BAKAR, A.A. (2014) Thermal Properties and Aging Characteristics of Chemically Modified Oil Palm Ash-Filled Natural Rubber Composites. Iran. Polym. J, 23(9), 723–730.CrossRefGoogle Scholar
  11. 11.
    LI, G. AND KOENIG, J.L. (2005) A Review of Rubber Oxidation. Rubber Chem. Technol., 78(2), 355–390.CrossRefGoogle Scholar
  12. 12.
    CHEN, S.F. AND NG, C.S. (1984) The Natural Higher Fatty Acid Soaps in Natural Rubber Latex and Their Effect on the Mechanical Stability of the Latex. Rubber Chem. Technol., 57(2), 243–253.CrossRefGoogle Scholar

Copyright information

© The Malaysian Rubber Board 2017

Authors and Affiliations

  • H. Liu
    • 1
  • Q. Wang
    • 1
  • Y. Liu
    • 1
    • 3
  • D. He
    • 1
  • X. Gao
    • 2
  • H. Yu
    • 1
    Email author
  1. 1.Agricultural Products Processing Research InstituteChinese Academy of Tropical Agricultural SciencesZhanjiangChina
  2. 2.Rubber Research InstituteChinese Academy of tropical Agriculture SciencesDanzhouChina
  3. 3.School of Materials Science and EngineeringNorth University of ChinaTaiyuanChina

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