Effect of the stretching on the network structure of carbon black filled EPDM rubbers.

Nicolas Candau 1 Jean-Luc Bouvard 1 Edith Peuvrel-Disdier 1 Rudy Valette 1 Noëlle Billon 1
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : The present work proposes an approach to identify the network structural evolution of EPDM rubbers induced by loading. An experimental device based on two camera pair systems has been developed in order to accurately measure the volume change of rubber samples during stretching. Results show that the loading is associated with an increase of volume change (∆V/V0) up to 2% and should be related to cavitation/decohesion at the interface between fillers and the rubbery matrix. Post mortem analysis of the microstructure, combining swelling and thermoporosimetry experiments, were then carried out. A good agreement has been found between the volume change and the microstructural evolution: as compared to virgin samples (not submitted to loading), the effective network density estimated from swelling measurements of tested materials (ν) is decreased of 7% and thermoporosimetry shows that damage during stretching is accompanied by an average increase of the chains length. These changes are significantly increased for samples stretched up to the rupture (λ=8). Indeed, in that case, the effective network density is decreased of more than 20%.
Keywords : thermoporosimetry rubber network damage EPDM volume measurement
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Communication dans un congrès
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01260847
Contributeur : Nadine Alziary - Manuel <>
Soumis le : vendredi 22 janvier 2016 - 15:52:03
Dernière modification le : lundi 12 novembre 2018 - 11:01:10

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  • HAL Id : hal-01260847, version 1

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Nicolas Candau, Jean-Luc Bouvard, Edith Peuvrel-Disdier, Rudy Valette, Noëlle Billon. Effect of the stretching on the network structure of carbon black filled EPDM rubbers.. ELASTOMERY 2015, 16ème Conférence- Elaboration, Characterisation, Recycling and Durability, Nov 2015, Tours, France. 2 p. ⟨hal-01260847⟩

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