ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Rupture properties of sulfur and zinc oxide vulcanizates of a carboxylic rubber have been 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.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1965.100031125
Permalink
