Collect. Czech. Chem. Commun. 1979, 44, 3665-3675

Paramagnetism of carbonization products formed from isotactic propylene containing synthetic zeolites

Josef Rychlý, Lydia Matisová-Rychlá and Ján Plaček

Institute of Polymers, Slovak Academy of Sciences, 809 34 Bratislava


The paramagnetism was studied of products obtained by the carbonization of isotactic polypropylene with synthetic zeolites NH4Y and NiY and their mixtures with ammonium phosphate, N-bromosuccinimide and dibenzoyl peroxide. The interpretation of ESR signals in carbonized samples is based on the existence of stable carbenes. In the case of synergistic mixtures of flame retardants such as ammonium phosphate, N-bromosuccinimide and dibenzoyl peroxide in polypropylene the increased rate of polymer oxidation is observed at 190°C which may by attributed mainly to the presence of ammonium phosphate.