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Modelling of mooney viscosity relaxation in natural rubber

Ehabe Ejolle Eugène, Bonfils Frédéric, Aymard Christian, Akinlabi A.K., Sainte-Beuve Jérôme. 2005. Modelling of mooney viscosity relaxation in natural rubber. Polymer Testing, 24 (5) : pp. 620-627.

Journal article ; Article de revue à facteur d'impact
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Abstract : Better assessment of natural rubber (NR) quality and processability, through the identification of new attributes, is still a major challenge. With this scope, 12 model samples of natural polyisoprene and two of synthetic polyisoprene were characterized in terms of Mooney torque relaxation, using the standardized ISO289 method (ML(1+4)100, explained later in the Section 1). The main purpose of this study was to identify a model that gave a better fit for the experimental decay of Mooney torque over time (ML(t) = f(t)) than the usual power law model used before (Y = at - b, [G.M. Bristow, A.G. Sears, The use of novel parameters in the assessment of natural rubber processability, NR Technol. 18 (1987); H.G. Burhin, W. Spreutels, J.M. Campbell, MV2000 Mooney viscometer: Mooney relaxation measurements on raw polymers and compounded rubber stocks, Kautsch. Gummi Kunstst. 43 (1990) 431]). The results showed that a generalized Maxwell model, and the Wu-Abbott empirical model (Y = 1 - a Ln(t) - (bt/(c + t))) [T. Wu, J.A. Abbott, Firmness and force relaxation characteristics of tomatoes stored intact or as slices, Postharvest Biol. Technol. 24 (2002) 59-68], recently used for describing stress relaxation of tomato flesh, allowed a better description of the relaxation curve for the samples studied than the power law or stretched exponential traditionally used. Moreover, the total relaxation time (Tm) given by the generalized Maxwell model showed good correlation with the total gel content of the samples studied. (Résumé d'auteur)

Classification Agris : Q60 - Processing of non-food or non-feed agricultural products
U10 - Computer science, mathematics and statistics

Champ stratégique Cirad : Hors axes (2005-2013)

Auteurs et affiliations

  • Ehabe Ejolle Eugène, IRAD (CMR)
  • Bonfils Frédéric, CIRAD-CP-UPR Qualité produits pérennes (FRA) ORCID: 0000-0001-7016-4770
  • Aymard Christian
  • Akinlabi A.K., RRIN (NGA)
  • Sainte-Beuve Jérôme, CIRAD-CP-DIR (FRA)

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Source : Cirad - Agritrop (https://agritrop.cirad.fr/526640/)

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