|
|||||
|
|
Study of chain branching in natural rubber using size-exclusion chromatography coupled with a multi-angle light scattering detector (SEC-MALS) |
|
| Authors: | Chandy Kim Stephane Guilbert |
| Institution: | a Cambodian Rubber Research Institute, P.O. Box 1337, Phnom Penh, Cambodia b UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes, CIRAD, INRA, Montpellier SupAgro, Université de Montpellier 2, UMR IATE - TA B 62/16, 73, rue JF Breton, 34398 Montpellier Cedex 5, France c UMR 1208 Ingénierie des Agropolymères et Technologies Emergentes, CIRAD, INRA, Montpellier SupAgro, Université de Montpellier 2, UMR IATE - Bât. 35, 2, place Viala, F-34000 Montpellier, France |
| Abstract: | 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. |
| Keywords: | Natural rubber Branching Nanoaggregate SEC-MALS |
| 本文献已被 ScienceDirect 等数据库收录！ | |