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Titre du document / Document title

Modelling of Mooney viscosity relaxation in natural rubber

Auteur(s) / Author(s)

EHABE E. (1) ; BONFILS F. (2) ; AYMARD C. (2) ; AKINLABI A. K. (3) ; SAINTE BEUVE J. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) IRAD Ekona Regional Research Centre, PMB 25, Buea, CAMEROUN
(2) CIRAD, Département des Cultures Pérennes, TA80/16, Avenue d'Agropolis, 34032 Montpellier, FRANCE
(3) Rubber Research Institut of Nigeria, PMB 1049, Benin City, Edo State, NIGERIA

Résumé / 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 (τm) given by the generalized Maxwell model showed good correlation with the total gel content of the samples studied.

Revue / Journal Title

Polymer testing    ISSN  0142-9418   CODEN POTEDZ 

Source / Source

2005, vol. 24, no5, pp. 620-627 [8 page(s) (article)] (17 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kindlington, ROYAUME-UNI  (1980) (Revue)

Mots-clés anglais / English Keywords

Diene polymer

;

Technological properties

;

Stress relaxation

;

Empirical model

;

Elastomer

;

Theoretical study

;

Isoprene polymer

;

Processability

;

Natural rubber

;

Modeling

;

Mots-clés français / French Keywords

Viscosité Mooney

;

Diène polymère

;

Propriété technologique

;

Relaxation contrainte

;

Modèle empirique

;

Elastomère

;

Etude théorique

;

Isoprène polymère

;

Ouvrabilité

;

Caoutchouc naturel

;

Modélisation

;

Mots-clés espagnols / Spanish Keywords

Dieno polímero

;

Propiedad tecnológica

;

Relajación tensión

;

Modelo empírico

;

Elastómero

;

Estudio teórico

;

Isopreno polímero

;

Laborabilidad

;

Caucho natural

;

Modelización

;

Mots-clés d'auteur / Author Keywords

Polyisoprene

;

Natural rubber

;

Mooney viscosity

;

Relaxation

;

Gel

;

Structure

;

Models

;

Localisation / Location

INIST-CNRS, Cote INIST : 18821, 35400012478237.0120

Nº notice refdoc (ud4) : 16869130



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