E. Lisa, J. Pospíšil
Mar 8, 2007
Citations
0
Influential Citations
2
Citations
Journal
Journal of Polymer Science: Polymer Symposia
Abstract
Differences in the antioxidative properties of isomeric dihydric phenols, observed in the stabilization of polypropylene, were thoroughly followed in initiated oxidations of tetralin, cumene, styrene, and 9,10-dihydroanthracene. 2-tert-Butylhydroquinone and 4-tert-butylpyrocatechol were used as stabilizers. Values of the induction periods and of the stoichiometric factor, n, were used to rate the activities. In all cases, 2-tert-butylhydroquinone caused lower n values than 4-tert-butylpyrocatechol. The value n of the latter was not significantly influenced either by the temperature or by the concentration of the reaction components. Under similar conditions, the value n of 2-tert-butylhydroquinone was increased with increased rate of initiation. It is possible to state, on the basis of the obtained results, that a side initiation of chains is the cause of the low activity of 2-tert-butylhydroquinone in the inhibited oxidation of tetralin. Such a side initiation can be precipitated by an interaction between an aryloxy radical derived from 2-tert-butylhydroquinone and tetralyl hydroperoxide.