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Stress softening in elastomer blends
Author(s) -
Meluch William C.
Publication year - 1969
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1969.070130618
Subject(s) - materials science , softening , elastomer , composite material , butyl rubber , elongation , hysteresis , work (physics) , natural rubber , stress (linguistics) , thermodynamics , ultimate tensile strength , physics , linguistics , philosophy , quantum mechanics
Compressive stress softening (Mullins effect) in black‐filled vulcanizates of the blended system natural : nitrile : brominated butyl rubber has been investigated. The results are expressed in terms of parameters derived from successive stress‐strain cycles. The ratio of the work done on loading in the first and second cycles is called the load work ration, R w . A similar quantity, R h , is defined for the loss or hysteresis work. Both load and loss work ratios show a compositional dependence similar to other properties of blends. The variation of R w and R h with composition agrees with the recent thesis of Mullins, Harwood, Payne and others that the Mullins effect is a property of the elastomer. Sudden variation of R h with elongation has been interpreted in light of recent results of R. W. Smith as indicative of vacuole formation.