𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Mechanisms of antioxidant action: The reaction of hindered phenols with rubber in the presence of free radicals

✍ Scribed by K.W. Sirimevan Kularatne; G. Scott

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
639 KB
Volume
14
Category
Article
ISSN
0014-3057

No coin nor oath required. For personal study only.

✦ Synopsis

Simple hindered phenols, containing ortho or para methyl groups, react with natural rubber latex in the presence of oxidizing free radicals (alkoxy or acyloxy), giving t,p to 20% yields of bound antioxidant. This reaction is most efficient when the concentration of the phenolic antioxidant in the rubber is less than o/ 1/o-As the concentration is increased, side reactions involving both the phenol (stilbenequinone formation) and the rubber (cross-linking) supervenes. The efficiency of the bound antioxidants is much higher than conventional antioxidants under aggressive conditions of air oven ageing and solvent or detergent extraction. This effect is due primarily to the non-removal of the bound antioxidants under these conditions whereas the conventional antioxidants are removed completely.

πŸ“œ SIMILAR VOLUMES

Mechanisms of antioxidant action: The in
Mechanisms of antioxidant action: The involvement of nitroxyl radicals in the antifatigue action of secondary amines
✍ A.A. Katbab; G. Scott πŸ“‚ Article πŸ“… 1981 πŸ› Elsevier Science 🌐 English βš– 426 KB

lsopropylaminodiphenylamine (IPPD, I) and a hindered bispiperidine ella) are effective antifatigue agents in vulcanized rubber. The former is also a powerful thermal antioxidant and antiozonant whereas the latter is not. An investigation of the mechanism of antifatigue action shows that both I and i

A study of the interaction of mechanical
A study of the interaction of mechanically generated polypropylene radicals with phenolic antioxidant in the presence of oxygen by EPR spectroscopy
✍ Zuzana HlouΕ‘kovΓ‘; Jozef Lustoň; FrantiΕ‘ek SzΓΆcs πŸ“‚ Article πŸ“… 1993 πŸ› John Wiley and Sons 🌐 English βš– 669 KB

lsotactic polypropylene (iPP) was mechanically degraded in the absence and presence of a phenolic antioxidant at liquid nitrogen temperature in the presence of oxygen. The interaction of the primarily formed iPP macroradicals with oxygen and phenol was studied by EPR spectroscopy in the temperature

Substituent effects in the reaction of p
Substituent effects in the reaction of phenols with polyacrylonitrile radicals
✍ L.N. Patnaik; S.N. Patnaik; S.P. Rout; M.K. Rout πŸ“‚ Article πŸ“… 1982 πŸ› Elsevier Science 🌐 English βš– 288 KB

Substituent effects in the reactivities of phenols towards polyacrylonitrile radicals have been studied in terms of Swain and Luptons' field (FR) and resonance (Rk) components of the substituent parameters and the unique positional weighting factors (fj and r j) proposed by Williams and Norrington,