Antioxidants and stabilizers—XXXI. A contribution to the knowledge of antioxidative properties and transformations of 2,2′-methylenebis (4-methyl-6-tert, butylphenol)

✍ Scribed by L. Zikmund; L. Taimr; J. Čoupek; J. Pospisil

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 453 KB
• Volume: 8
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(72)90084-5

✦ Synopsis

The products of the reaction of 2,2 '-methylenebis(4-methyl-6-tert.butylphenol)fl) with the tert.butoxy and tert.butylperoxy radicals, that is dimer II, trimer III and a cyclohexadienone derivative IV, were used to identify compounds formed from bisphenol I during an inhibited oxidation of tetralin (60 °) and isotactic polypropylene (180°). By means of the GPC method, compounds II and III and a tetralyl analogue of compound IV were proved to be formed during the oxidation of tetralin inhibited with bisphenol I. At a high oxidation temperature of polypropylene, compounds II and III disappeared faster from the substrate in the presence of bisphenol I; however, in both the substrates under investigation their antioxidative activity was confirmed. A mixture of bisphenol I with phenols II or III does not exhibit any synergistic properties. The cyclohexadienone derivative IV has no antioxidative properties; during oxidation of polypropylene it depresses the activity of bisphenol I. At the temperature used for the oxidation of tetralin, however, its presence affected favourably the activity of bisphenol I.