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Static and dynamic strain‐dependent viscoelastic behavior of black‐filled EPDM vulcanizates
Author(s) -
Namboodiri C. S. S.,
Tripathy D. K.
Publication year - 1994
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.1994.070530704
Subject(s) - viscoelasticity , dynamic modulus , materials science , dynamic mechanical analysis , strain (injury) , composite material , modulus , relaxation (psychology) , displacement (psychology) , deformation (meteorology) , polymer , medicine , psychology , social psychology , psychotherapist
The strain dependence of the dynamic mechanical properties of HAF‐N330‐filled EPDM vulcanizate was studied using a Rheovibron DDV III EP. It is shown that when a dynamic strain is superposed on a static strain, the viscoelastic response of filled rubbers becomes more complex. Under these conditions, dynamic mechanical properties do not correlate with the double strain amplitude. A strain called the “total strain” has been defined in order to interpret the experimental results. It is also shown that the dynamic mechanical properties are displacement velocity dependent, while the comparison is made under identical conditions of strain and frequency. Separability of time and strain effects is observed for the storage modulus, whereas the loss modulus is shown to be a nonseparable function. The elastic and the relaxation components, constituting the mixed function representing the storage modulus are shown to have similar deformation dependence. © 1994 John Wiley & Sons, Inc.