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Effect of crosslinking density on biaxial relaxation of SBR by using reduced variables

1974; Wiley; Volume: 12; Issue: 1 Linguagem: Inglês

10.1002/pol.1974.180120111

1542-9385

R. J. Arenz,

Elasticity and Material Modeling

Abstract Use of reduced variables to account for the effect of crosslinking density ν e in a styrene–butadiene rubber (SBR) system is demonstrated for general biaxial stress states. Recently published results from stress relaxation tests on five SBR vulcanizates crosslinked to different degrees by tetramethylthiuram disulfide were superposed by using ν e as a reduction variable. The equilibrium shear modulus G e calculated from the master relaxation curve at long reduced times was in satisfactory agreement with other results for SBR. The time‐axis shifts were related in a linear logarithmic manner to the crosslinking density but had a slope slightly less than values previously reported for elastomer systems.