Novel insight into the gel phase of Hevea natural rubber

Ehabe E.E., . and Bonfils F., . Novel insight into the gel phase of Hevea natural rubber. pp. 1-10. ISSN 1511-1768

In a suitable organic solvent Hevea natural rubber (NR) disintegrates into an insoluble gel phase (macrogel) and a sol phase consisting of polyisoprene chains with micro-aggregates (microgel). Studies on Hevea microgel following the advent of its quantitation by steric exclusion chromatography (SEC) are quite recent. In this study transesterification of NR favoured macrogel elimination with unclear effects on the microgel. The NRs structure and the relative gel quantities varied in solution (depending on the solvents used) and during transesterification to produce substantial quantities of low-to-average molar mass chains (probably from the macrogel and/or the microgel fraction). The macrogel broke down equally to microgel. This microgel representing 25“30 Hevea rubber remained insensitive to transesterification. The NRs structure was made up essentially of variably-sized membrane-delimited entities. On dissolution these entities were denatured and through this liberated more or less branched polyisoprene chains as well as some microgel and macrogel.

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Abstract

In a suitable organic solvent Hevea natural rubber (NR) disintegrates into an insoluble gel phase (macrogel) and a sol phase consisting of polyisoprene chains with micro-aggregates (microgel). Studies on Hevea microgel following the advent of its quantitation by steric exclusion chromatography (SEC) are quite recent. In this study transesterification of NR favoured macrogel elimination with unclear effects on the microgel. The NRs structure and the relative gel quantities varied in solution (depending on the solvents used) and during transesterification to produce substantial quantities of low-to-average molar mass chains (probably from the macrogel and/or the microgel fraction). The macrogel broke down equally to microgel. This microgel representing 25“30 Hevea rubber remained insensitive to transesterification. The NRs structure was made up essentially of variably-sized membrane-delimited entities. On dissolution these entities were denatured and through this liberated more or less branched polyisoprene chains as well as some microgel and macrogel.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Chromatography
AGROVOC Term:	Hevea rubber
AGROVOC Term:	Hevea
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Biochemistry
AGROVOC Term:	Phytochemistry
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23005

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