The study of the inhibiting activity of poly (2-methyl-5-ethynylpyridine) during initiated oxidation of cumene

✍ Scribed by A. A. Berlin; R. M. Aseeva; A. A. Ivanov; A. V. Kotova

• Book ID: 105340894
• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Weight: 246 KB
• Volume: 40
• Category: Article
• ISSN: 0360-8905
• DOI: 10.1002/polc.5070400112

✦ Synopsis

Abstract

The inhibiting activity of poly (2‐methyl‐5‐ethynylpyridine) (PEP) has been studied in the cumene oxidation reaction initiated by azobisisobutyronitrile at 55–65°C. According to the kinetic data the reaction between RO~2~ radical and PEP is irreversible. About 12% of the most active macromolecules of PEP react during the induction period followed by retarded oxidation of cumene. The quantity of terminated peroxy radicals reaches 1.5 per molecule of the inhibitor. This quantity is not altered when PEP concentration changes. Macromolecules of PEP differ in their radical reactivity. An increase of PEP molecular weight leads to the increase in PEP reactivity and in the fraction of active molecules. The paramagnetic centers of PEP interact with peroxy radicals at the maximum rate and disappear at the initial stage of oxidation.