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Reversibility of the Mullins effect for extending the life of rubber components

Corby, Matthew; De Focatiis, Davide S. A.


Matthew Corby


This paper investigates the recovery of the Mullins effect by heat-treatment of predeformed (300% tensile strain) carbon-black filled ethylene-propylene-diene rubber (EPDM) in an air-circulating oven. The tensile response was measured, and the secant modulus at 100% strain, energy to deform to 300% strain, ultimate tensile strength, strain to failure and permanent deformation were compared to undeformed specimens subjected to the same heat-treatments, 3–24 h at temperatures of 60–80°C. Recovery of properties is dependent on time and temperature of treatment, increasing with longer times and higher temperatures. Recovery of secant modulus follows time-temperature superposition (TTS) with an activation enthalpy of 111 kJ mol−1; TTS is shown to be applicable to the other measures, probably because of additional cure in the rubber resulting from the heat-treatment. Treatments under vacuum led to similar effects as in an air-circulating oven.

Journal Article Type Article
Acceptance Date Feb 16, 2018
Online Publication Date Mar 7, 2018
Publication Date Jan 2, 2019
Deposit Date Dec 19, 2018
Journal Plastics, Rubber and Composites
Print ISSN 1465-8011
Electronic ISSN 1743-2898
Publisher Maney Publishing
Peer Reviewed Peer Reviewed
Volume 48
Issue 1
Pages 24-31
Keywords Materials Chemistry; General Chemical Engineering; Polymers and Plastics; Ceramics and Composites
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