Study of chain branching in natural rubber using size-exclusion chromatography coupled with a multi-angle light scattering detector (SEC-MALS)
The different rheological behaviour of natural rubber (NR) compared to industrial synthetic poly(cis-1,4-isoprene) (SR) has been attributed to the gel phase and long-chain branching. Previous studies on branching in NR were carried out using the fractionation technique by precipitation to obtain narrow molar mass distribution. In this study, chain branching of poly(cis-1,4-isoprene) in NR was characterised by size-exclusion chromatography coupled with an online multi-angle light scattering detector (SEC-MALS). The nanoaggregates adsorbed on the column packing interfered with branching characterisation for short and medium chains (Mw < 1000 kg/mol). Using a master curve of linear standard poly(- cis-1,4-isoprenes), SEC-MALS revealed no or very little branching in the higher chains (1000 < Mw < 10,000 kg/mol) of natural rubber contrary to previous studies. This study showed that the soluble portion of NR samples was composed of almost linear poly(cis- 1,4-isoprene) and nanoaggregates with rather compact structures.
| Main Authors: | , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | Q60 - Traitement des produits agricoles non alimentaires, U30 - Méthodes de recherche, caoutchouc, polymère, propriété rhéologique, structure chimique, chromatographie, propriété optique, http://aims.fao.org/aos/agrovoc/c_6678, http://aims.fao.org/aos/agrovoc/c_32041, http://aims.fao.org/aos/agrovoc/c_6553, http://aims.fao.org/aos/agrovoc/c_15893, http://aims.fao.org/aos/agrovoc/c_1594, http://aims.fao.org/aos/agrovoc/c_5371, http://aims.fao.org/aos/agrovoc/c_4073, |
| Online Access: | http://agritrop.cirad.fr/550019/ http://agritrop.cirad.fr/550019/1/document_550019.pdf |
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