Journal of Polymer Science Part A General Papers · 1963 · 17 citations · 7 references
Natural SciencesChemistryMaterials SciencePolymer ChemistryPolymer MaterialsSpectroscopyPolymer CharacterizationPolymer Physical ChemistryPolymer StructurePolymerization ChemistryOrganic Radical SpectroscopyOxidationPeroxide FormationPolymer Radiation DamageRadiation Chemistry Of PolymersRadiation OxidationRadiation-induced Free RadicalsRadical Polymers
Abstract Results of ESR and infrared studies of radiation oxidation of polypropylene (PP) and poly(vinyl chloride) (PVC) are reported. The effect of oxygen on the free radicals, FR VIII (CH 2 Ċ(CH 3 )CH 2 ) and FR IX (CH 2 Ċ(CH 3 ) 2 ), FR I′ (polyenyl radicals with shorter conjugations), FR I (polyenyl radicals with longer conjugations) in PP and FR I′ , FR I in PVC was studied. On introduction of air, FR VIII and FR IX in PP and FR I′ in PP and PVC showed the asymmetric singlet spectrum of the peroxide radical. Oxygenation of the radicals began at low temperatures: −135°C. for FR VIII and FR IX , −144°C. for FRp in PP, and −170°C. for FR I′ in PVC. By reevacuation, the oxygen molecule could be removed from the peroxide radical of FR I′ in PP and PVC, while deoxygenation was impossible from FR VIII and FR IX . Oxidation of the radicals in PP and PVC gave carbonyl and hydroxyl groups. The number of carbonyl groups produced per radical was estimated as 3.4 and 1.6 for FR I′ in PP and PVC, respectively.
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