000			01598nam a2200205Ia 4500
008			220216s9999 xx 000 0 und d
100			_aGeorge B
245		0	_aIn situ epoxidization of natural rubber latex by performic acid and the kinetics of the reaction
260			_bIndian Journal of Natural Rubber Research _c1992
300			_a179-187
520			_aEpoxidation of natural rubber latex stabilised with a nonionic surfactant was carried out with performica acid generated in situ. The reaction was performed at 30, 45, 50 and 60 degree C at a dry rubber content (DRC) of 20 and concentration of formic acid and hydrogen peroxide 0.955 and 3.75 modle dm3 respectively in the aqueous phase of the latex. Product characterization by 1H NMR and IR spectroscopic methods indicated significant influence of temperature on the extent of epoxidation as well as ring opening reactions. Epoxidation to the extent of 25-35 mole per cent could be reached without ring opening. The concentration of ring opened products at higher levels of epoxidation was found to be low. The reaction followed pseudo-first order kinetics with the formation of performic acid as the rate dtermining step. This was further confirmed by carrying out the reaction at 10 and 15 per cent DRC keeping the formic acid and hydrogen peroxide concentrations in the aqueous phase the same.
650			_aEpoxidization
650			_aEpoxidization kinetics
650			_aNatural rubber latex
650			_aPerformic acid
650			_aRing opening reactions
700			_aAbraham S
700			_aMathew N M
942			_cJS
999			_c60930 _d60930