Abstract - Modification of Deproteinised Natural Rubber by Graft-copolymerisation of Methyl Methacrylate


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Modification of Deproteinised Natural Rubber by Graft-copolymerisation of Methyl Methacrylate Nurul Hayati Yusof, Seiichi Kawahara and Ma'zam Md Said 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 X 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. back
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