STRESS RELAXATION AND STRUCTURE OF HIGH TEMPERATURE ELASTOMERS
Abstract
Sol-gel relations in natural rubber vulcanizates have been studied both during network formation and degradation. The experimental values obtained during network formation, deviated markedly from theory, both as to magnitude and by showing an unexpected dependence on the primary chain length. It was shown that this deviation could be attributed to physical crosslinks, resulting from chain entanglements trapped during network formation. The total number of elastically effective chain entanglements per unit volume was found to be a function of the concentration of chemical crosslinks. The effectiveness of a chain entanglement was also found to be a function of the concentration of chemical crosslinks. The theoretical expressions of Horikx (J. Polymer Sci. 19:445, 1956) for network degradation were modified to include the effect of chain entanglements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1960
- Accession Number
- AD0250735
Entities
People
- K.w. Scott
- V.r. Allen
Organizations
- University of Akron