Abstract
The replacement of a p-phenylene by a m-phenylene nucleus in polyarylene amines, the addition to a polymer chain of hetero-atoms and an increase in the reaction temperature from 200 to 300° reduce stability, while treatment of a polymer with Al 2O 3 and isolation of a fraction with narrow MWD increases heat stability up to partial auto-stabilization. In most of the cases examined it was found that the thermal decomposition of polyarylene amines takes place in many stages; the apparent activation energy of the first stage varies from 14 to 40 kcal/mole according to the structure and method of preparing the polymer. This fact and the relative constancy of exothermal maxima suggests that the rupture of CN bonds in the main chain is the limiting factor in thermal decomposition of the polymers studied.
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