Abstract
A significant retardation effect by PbO on the formation of volatile products from isotactic polypropylene (IPP) was found at temperatures up to 380°C. The effect is explained by the formation of a surface active form of PbO (possibly Pb 3O 4) which is formed by interaction of PbO with peroxy radicals. Primary and secondary alkyl radicals terminate effectively on the active surface and the kinetic length of the degradation reaction is thus decreased. A compensation effect exists between the Arrhenius parameters ln A and E for both inhibited and uninhibited formation of volatile products.
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