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Paper Details

Phase transfer catalysis: kinetics of acrylonitrile polymerization initiated by potassium peroxomonosulfate - cetylpyridinium chloride system

K. Mohammed Mustaque, S. Jayakumar and T.K. Shabeer*

Journal Title:Journal of Chemical, Biological and physical sciences

Kinetics of phase transfer catalyst (PTC) assisted polymerization of acrylonitrile (AN) initiated by potassium peroxomonosulfate (KHSO5) cetylpyridinium chloride (CPC) system was investigated in ethyl acetate/water system at 60C under N2 atmosphere and unstirred condition. The effect of varying the concentrations of AN, KHSO5, CPC, H+, and ionic strength on Rp were studied. From the study, reaction orders with respect to AN, KHSO5 and CPC were found to be 1.5, 0.5 and 1. Thermodynamic parameters such as overall activation energy (Ea), entropy of activation (?S#), enthalpy of activation (?H#) and free energy of activation (?G#) were calculated by conducting the reaction at different temperatures in the range 50-60C. Rate of the reaction was found to be unaffected by a change in the acid strength and ionic strength of the reaction medium. To account for the experimental observations, the most probable mechanism has been proposed and the rate expression was derived from it.