Post-harvest maturation of Hevea brasiliensis latex coagula: Ranking of the key drivers of the mesostructure and physical properties of natural rubber

Noinart Jidapa, Bonfils Frédéric, Musigamart Natedao, Sainte Beuve Jérôme, Flori Albert, Liengprayoon Siriluck, Rattanaporn Kittipong, Granet Françoise, Vaysse Laurent. 2022. Post-harvest maturation of Hevea brasiliensis latex coagula: Ranking of the key drivers of the mesostructure and physical properties of natural rubber. Journal of Rubber Research, 25 : 5-18.

https://doi.org/10.1007/s42464-022-00146-7

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Résumé : The coagula derived from Hevea latex are the main raw material for block natural rubber production, especially for the two most commercialized grades (TSR10 and TSR20). The properties and mesostructure of dry natural rubber depend on several factors during coagula maturation. This work investigated an experimental design allowing concomitant control of several factors during maturation of cup coagula, namely, temperature, relative humidity, atmosphere, vertical weight, coagulation conditions, clone, and maturation duration. For each combination of factors, several indicators were measured. They dealt with the coagula (thickness, DRCcoag), with the dry rubber (physical properties (P0, PRI, ASHT), and the mesostructure (Gel>1µ, Mn, Mw, Mz). Statistical treatment of the results (recursive partition) led to a hierarchical ranking of factors for each measured indicator. The first-ranked parameter was coagulation mode followed by genotype (clone) or maturation duration, temperature, or weight application. The provided identification of the most important drivers occurring during coagula maturation could allow improvements of the post-harvest operational handling aiming at a better control of the variability of produced natural rubber properties.

Mots-clés Agrovoc : caoutchouc, Hevea brasiliensis, coagulation, maturation après récolte, propriété physicochimique, facteur du milieu, génotype

Mots-clés libres : Natural rubber, Maturation, Coagulation, Factor ranking, Hevea brasiliensis, Post-harvest

Classification Agris : Q60 - Traitement des produits agricoles non alimentaires

Champ stratégique Cirad : CTS 7 (2019-) - Hors champs stratégiques

Agences de financement hors UE : Manufacture Française des Pneumatiques Michelin

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