Abstract
The torsional behaviour of 1, 3 and 5 phr peroxide crosslinked natural rubber has been characterized over a range of strains from near the undistorted state (γ ≈ 0.017) to γ ≈ 1.0. Isochronal measurements of both torque and normal force were used to calculate values of the derivatives of the strain energy function W with respect to the first and second stretch invariants I1 and I2. In the course of our work we found that, contrary to many reports in the literature, ∂W ∂I1 was affected significantly by the amount of crosslinking. Finally for the 1 phr peroxide crosslinked rubber it was found that, while ageing for 14 months at ambient conditions did not significantly affect the small-strain torsional modulus, G = 2( ∂W ∂I1 + ∂W ∂I2), it did significantly affect the individual derivatives ∂W ∂I1 and ∂W ∂I2.
Original language | English |
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Pages (from-to) | 1495-1501 |
Number of pages | 7 |
Journal | Polymer |
Volume | 24 |
Issue number | 11 |
DOIs | |
State | Published - Nov 1983 |
Keywords
- Ageing
- normal force
- rubber
- small-strain
- strain energy function
- torsion