FRACTURE PROPERTIES OF CARBOXYLIC RUBBERS,
Abstract
Rupture properties of sulfur and zinc oxide vulcanizates of a carboxylic rubber were experimentally determined. When the logarithm of the strength at break is plotted against the logarithm of the strain at break, failure envelopes are obtained for the two vulcanizates which diverge at long times or high temperatures. As a consequence of this experimental fact it is apparent that while there exists a failure envelope which uniquely describes a given viscoelastic system there is no general shape of the failure envelope representative of all the rupture properties of an elastomer through all degrees of vulcanization. It is shown that the molecular fracture theory of Bueche and Halpin provides a quantitative basis for the analysis of the strength properties of elastomers through a wide range of vulcanizate quality, provided the specific character of the network structure is taken into account. It is suggested that the so-called 'unique' strength properties of metal oxide vulcanizates are in reality a natural reflection of a sparse network crosslinkage concentration. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0626929
Entities
People
- F. Bueche
- John C. Halpin
Organizations
- University of Dayton Research Institute