The effect of solvation on thermal decomposition of 2,2'-azoisobutyronitrile
in the acrylonitrile/methyl methacrylate system (in English)
The rate constant of thermal decomposition of 2,2'-azoisobutyronitrile (AIBN), kd, was studied in acrylonitrile (AN)/methyl methacrylate (MMA) mixtures in relation to mixture composition at 60 °C. In pure AN and in pure MMA as solvent (boundary conditions), the values were found to be identical, viz., kd = (7.20 } 0.3) • 1СГ4 min4 . In AN/MMA mixtures, /crf-values were found to be related to AN/MMA mixture composition. The kd = f(x,i) functional relationship is nonlinear and its graphical course is characterized by a shallow flat minimum that extends over a broad concentration range, 10 to 90 mol % AN. The relationship has been interpreted in terms of the hypothesis of solvation of the initiator (AIBN) molecule by AN and MMA molecules.
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