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L. Ślusarski, M. Zaborski


Structure of network and the strength of vulcanizates

Polimery 1995, No 7-8, 453


DOI: dx.doi.org/10.14314/polimery.1995.453

Summary

A literature review (comprising also own work of the Authors) led to the conclusion that the type of network knots determines the tensile strength of vulcanizates. The presence in the structure of crosslinked elastomer of low-energy knots capable of rearrangements in the field of for ces results in an increase in this strength. There are many indications that in the case of application of sulphur donors or elemental sulphur as crosslinking agents, crosslinking is a topochemical reaction and takes place mainly in microdomains around the particles of the active complex. As a consequence, in spite of the assumptions of the classical theory of elasticity, the distribution of chain lengths in the thus-formed space network is much narrower than that described by the Gaussian function. In such case, the external tension exerted on the sample is distributed on a larger number of chains and the catastrophic mechanism of their rupture, characteristic of the Gaussian network, is not valid.


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