ACCELERATED DETERIORATION OF ELASTOMERS
Abstract
The object of this research is to find ways to degrade elastomers rapidly at or near room temperature. This has led to the study of ef fects of soluble metal salts, hydrazines and thiols on rates of oxidation and chain scission of polyisoprene. The metal compounds examined have no significant pro- oxidant effect in the absence of oxidation products (peroxides). With partially oxidized polyisoprene, however, these same metal compounds show pronounced pro oxidant effects. Most metal octanoates and naphthenates catalyze the decomposition of rubber hydroperoxides. The proportion of chain cleav age and the rate of chain initiation vary with the metal. Thus, cobalt and manganese salts cause most rapid disappearance of peroxides but the former strongly accelerates oxidation while the latter does not. Iron gives the most chain scissions for the peroxide decomposed, and about double the oxidation rate with 0.005 M ABN (2,5-azobis(2-methylpropionitrile)). Nickel, copper, lead, zinc, and calcium salts have little or no effect on the rate of oxidation.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 08, 1963
- Accession Number
- AD0403652
Entities
People
- Frank R. Mayo
- Jorge Heller
- Katherine Crawford
- Kurt Egger
Organizations
- SRI International