Comparative study of the mesostructure of natural and synthetic polyisoprene by size exclusion chromatography-multi-angle light scattering and asymmetrical flow field flow fractionation-multi-angle light scattering

Dubascoux Stéphane, Thepchaler Chalao, Dubreucq Eric, Wisunthorn Pansook Suwaluk, Vaysse Laurent, Kiatkamjornwong Suda, Nakason Charoen, Bonfils Frédéric. 2012. Comparative study of the mesostructure of natural and synthetic polyisoprene by size exclusion chromatography-multi-angle light scattering and asymmetrical flow field flow fractionation-multi-angle light scattering. Journal of Chromatography A, 1224 (1) : 27-34.

https://doi.org/10.1016/j.chroma.2011.12.010

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Quartile : Q1, Sujet : CHEMISTRY, ANALYTICAL / Quartile : Q1, Sujet : BIOCHEMICAL RESEARCH METHODS

Résumé : This paper presents results from the first analyses of the mesostructure of natural rubber (NR) by asymmetrical flow field flow fractionation (AF4). The results are compared with those obtained by size exclusion chromatography (SEC) in terms of average molar masses, radius of gyration and insoluble part (or gel quantity). Comparable results were obtained for the sample not containing gel. Conversely, for samples with gel, significant differences were found due to the presence of microaggregates. Contrary to SEC, AF4 fractionation enables partial fractionation of polyisoprene chains and microaggregates in a single run without preliminary treatment. The results presented here also highlight the special structure (very compact spheres) of microaggregates in NR compared to chemical crosslinked microaggregates in synthetic polyisoprene. The advantages and drawbacks of both techniques for analysing NR samples are also discussed.

Mots-clés Agrovoc : caoutchouc, Hevea brasiliensis, structure chimique, isoprène, chromatographie

Mots-clés géographiques Agrovoc : Thaïlande

Mots-clés complémentaires : Polyisoprène

Classification Agris : Q60 - Traitement des produits agricoles non alimentaires
U30 - Méthodes de recherche

Champ stratégique Cirad : Hors axes (2005-2013)

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