Modification of deproteinised natural rubber by graft-copolymerisation of methyl methacrylate
2008
Nurul Hayati Y. | Kawahara S. | Ma'zam M. S.
Natural Rubber (NR) latex was deproteinised by incubation with urea in the presence of sodium dodecyl sulfate (SDS). Urea deproteinised natural rubber (U-DPNR) latex was graft-copolymerised with Methyl Methacrylate (MMA) at a monomer feed of 5, 10, 15 and 20 wt % on rubber. The monomer content, monomer conversion and grafting efficiency of the copolymerisation reaction were determined. The resulting graft copolymers were characterised by FT-IR spectroscopy and morphology observed using a transmission electron microscope (TEM). The monomer content, conversion and grafting efficiency of NR-graft-PMMA, U-DPNR-graft-PMMA and E-DPNR-graft-PMMA were compared as well. The results showed that, MMA feed of 15 wt % on rubber, initiator concentration of 6.6 × 10 5 mol/g-rubber and reaction temperature at 30ºC were found to be suitable conditions to obtain high MMA content,high conversion and high grafting efficiency. The highest grafting efficiency was about 80 % at 15 wt % on rubber feed of MMA for U-DPNR-graft-PMMA and E-DPNR-graft-PMMA.
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