Effect of adventitious iron on epoxidation of natural rubber latex
1992
Farley, P. S. | Banthorpe, D. V. | Porter, M.
The epoxidation of natural rubber using hydrogen peroxide and formic acid is perturbed by the presence of adventitious iron(II), due to the interference of chemistry associated with Fenton’s Reagent and the facile generation of hydroxyl radicals. The extent of intervention is dependent on the concentration of iron(II) and can result in retardation of the rate of epoxidation due to the depletion of hydrogen peroxide, enhanced oxidative degradation and a reduction in the gel content of the rubber. Degradation of the surfactant leads to destabilisation of the latex and premature coagulation of the polymer for iron(II) concentrations above 10 p.p.m. Fenton’s Reagent may be useful as a chemical method to depolymerise polyisoprenoid latices at iron(II) concentrations above 50 p.p.m. However, vigorous gas and heat evolution and premature coagulation of the polymer can result in an uncontrollable and potentially hazardous reaction.
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