Abstract
Natural rubber (NR) mostly composes of cis-1,4-polyisoprene as rubber part and a few amounts of nonrubber part, mainly proteins and lipids. For the modification of NR, hydrogen peroxide and formic acid can be applied to produce epoxidized natural rubber (ENR) in the latex stage. The oxygen atom is added to the double bond of NR during epoxidation, resulting in oxirane (epoxide). The ENR reaction was allowed to operate at 60°C for 4 h. Characteristic infrared peaks at 870 and 835 cm-1 from Fourier Transform Infrared (FTIR) spectroscopy were used to calculate the mole percent of epoxidation. When the reaction time was increased, the proton-nuclear magnetic resonance (1H-NMR) spectra of ENR showed an increase in mole percent of epoxidation. So, FTIR and NMR could be used to characterize the yield percentage of ENR preparation.
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