| Popis: |
A study has been made of the oxidation of APP and IPP in the condensed phase and in 1,2,4-trichlorobenzene solution. The differences in the oxidation rates and hydroperoxide concentrations between the amorphous APP melt and the semi-crystalline IPP were attributed to the dissimilarities in the supermolecular structure, since those differences did not appear in solution. It was found that in the accelerating stage of the process, the oxidation in solution follows the kinetic rules of degenerate radical chain reactions under steady-state conditions, while in the condensed phase the condition of stationarity is not fulfilled. Solutions of IPP and APP behave similarly in many respects; significant differences were found, however, in the induction period of the process, as well as in the conversion dependence of the carboxyl group concentration and of the number of chain scissions. |
