Grafting of poly(vinyl alcohol) on natural rubber latex particles

Authors

  • W. Wongthep,

    1. Applied Chemistry Division, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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  • S. Srituileong,

    1. Applied Chemistry Division, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
    2. Center for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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  • S. Martwiset,

    1. Applied Chemistry Division, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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  • S. Amnuaypanich

    Corresponding author
    1. Applied Chemistry Division, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
    2. Center for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
    • Applied Chemistry Division, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Abstract

Poly(vinyl alcohol) (PVA) was grafted on natural rubber (NR) latex particles (NR-g-PVA) using potassium persulfate to generate active radicals on both NR particle surface as well as PVA molecules. 1H- and 13C-nuclear magnetic resonance spectroscopy suggested a possibly chemical attachment of PVA on the NR. The amount of graft-PVA expressed in term of grafting percentage (%G) increased almost linearly with the amount of PVA adding to the NR latex. Measuring by dynamic light scattering, the particle size of NR-g-PVA particles was larger than the size of unmodified NR, also it increased with the molecular weight and %G of PVA. Transmission electron microscopy images of the NR-g-PVA latex particles revealed that the size of PVA-grafted NR particle was enlarged by a layer of graft-PVA surrounding the NR particle. Given by the graft-PVA layer surrounding NR particles, the NR-g-PVA latex particles possessed better colloidal stability as lowering pH compared with the unmodified NR latex. Comparing with unmodified NR particles, the electrophoretic mobility of NR-g-PVA particles was lower due to the presence of graft-PVA that shifted the shear plane further away from the surface of the particles. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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