Factorial experimental design for grafting of vinyl monomers onto natural rubber latex

Authors

  • W. Arayapranee,

    1. Department of Chemical Engineering, Rangsit University, Phathum Thani 12000, Thailand
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  • G. L. Rempel

    Corresponding author
    1. Department of Chemical Engineering, University of Waterloo, Ontario N2L 3G1, Canada
    • Department of Chemical Engineering, University of Waterloo, Ontario N2L 3G1, Canada
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Abstract

Graft copolymerization of styrene (St) and methyl methacrylate (MMA) in the presence of natural rubber latex using cumene hydroperoxide/tetraethylenepentamine redox initiator system was prepared at various process variables. The synthesized graft copolymers were purified and then characterized by Fourier transformed infrared spectroscopy analysis. A full 24 factorial experimental design was applied to study the effect of various process variables on grafting efficiency. The following four independent variables considered to be mainly affecting the grafting efficiency were reaction temperature, rubber-to-monomer ratio, St-to-MMA ratio, and initiator amount used in the secondary polymerization. It was shown in this study that the reaction temperature significantly influenced the grafting efficiency, increasing as the temperature was increased. The amount of grafting increased with increasing rubber-to-monomer ratio and St-to-MMA ratio, whereas the amount of grafting decreased with increasing amount of initiator. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 455–463, 2004

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