SynopsisWe measured the rate of thermal decomposition of asobisisobutyronitrile (AIBN) from the rate of loss of 2,2-diphenylpiaryihydraayl (DPPH)on reaction of the free radic a l~ formed by thermal decomposition of azobisisobutponhile (AIBN) in organic solvents with DPPH. There has been some doubt about the quantitative relation between MRN and DPPH requhd to get the rate constant of thermal decomposition of AIBN. In the past, AIBN has been used in excess, and the rate constants measured by using DPPH are smaller than they ought to be. In our experiments we used as little of AIBN relative to DPPH as possible and obtained a value of 3.8 X at 50°C. as the rate constan6 of the firsborder reaction, which was shown satisfactorily by the linearity of the graph. We also obtained 32 kcal./mole as activation energy. We were also able to hake cl-r the meaning of the result when a large quantity of AIBN was used.
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