Antioxidants and stabilizers—LXXII. Products of reaction between oxidized polypropylene and 2,6-ditert-butyl-4-methylphenol

✍ Scribed by J. Kovářová-Lerchová; J. Pilař; G. Samay; J. Pospíšil

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 455 KB
• Volume: 14
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(78)90137-4

✦ Synopsis

Oxidation of atactic polypropylene (PPH) has been used in the preparation and characterization of hydroperoxide PPOOH, from which radicals PPOO. were generated. Their interaction with 2,6-ditert-butyl-4-methylphenol (BHT) demonstrated transformations of the antioxidant, leading, on the one hand, to peroxycyclohexadienone, PPOO-CHD, in which the residue of reacted BHT is bound on PPOO" and, on the other, to compounds resulting from the oxidative coupling .of BHT; of these, 4,4'-ethylenebis (2,6-ditert-butylphenol) and 3,3',5,5'-tetratert-butylstilbenequinone were identified. Further products of coupling are light-to deep-brown; some of them contain phenolic and quinomethinoidic functions. PPOO-CHD may take an active part in the atmospheric ageing of PPH arising from decomposition caused by heat, radiation or catalytic impurities.