ON THE STABILIZING EFFECT OF STERICALLY HINDERED AMINESAND NITROXIDE RADICALS IN THERMAL AND PHOTO-OXIDATIONOF POLYPROPYLENE

摘要

Antioxidant properties of HAS bound benzothioxanthene fluorescence probes has beenrnexamined by chemiluminescence in oxygen and at 140 o C. Non-isothermal experiments inrnnitrogen atmosphere revealed promotion of chemiluminescence due to HAS moiety bound tornbenzothioxanthene probe which follows the sequence: parent amine>alkoxyl amine>rnnitroxide radical. Stabilizing efficiency in polypropylene follows the opposite sequence, I.e.rnThe most efficient appears to be nitroxide radical. The effect of UV irradiation on the changesrnof residual stability at 140 o C was quantitatively assessed.