Citation
Kawahara S., . and Kodama S., . and Tanaka Y., . and Eng A. H., . and Tangpakdee J., . Epoxide groups in natural rubber. II. 13C-NMR study of undergraded natural rubbers. pp. 199-208. ISSN 1511-1768
Abstract
The level of epoxide groups on the natural rubber main-chain molecule is examined by 13C-NMR spectroscopy. The results show that while all the rubber samples contain trans isoprene units purified rubbers from fresh latices contain no detectable amount of epoxide groups. This is also found to be the case for fractionated rubbers of different molecular weights rubber samples of different clonal origin as well as rubbers isolated from different zones of centrifuged fresh latex. Nevertheless of the six commercial solid rubber samples examined SMR L and SMR 10 were found to contain trace amount of cis epoxide the levels of which are similar to that of trans isoprene units. It is concluded that natural rubber has no detectable amount of epoxide groups on the main-chain molecule.
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Abstract
The level of epoxide groups on the natural rubber main-chain molecule is examined by 13C-NMR spectroscopy. The results show that while all the rubber samples contain trans isoprene units purified rubbers from fresh latices contain no detectable amount of epoxide groups. This is also found to be the case for fractionated rubbers of different molecular weights rubber samples of different clonal origin as well as rubbers isolated from different zones of centrifuged fresh latex. Nevertheless of the six commercial solid rubber samples examined SMR L and SMR 10 were found to contain trace amount of cis epoxide the levels of which are similar to that of trans isoprene units. It is concluded that natural rubber has no detectable amount of epoxide groups on the main-chain molecule.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Latex |
| AGROVOC Term: | Epoxides |
| AGROVOC Term: | Centrifugation |
| AGROVOC Term: | Nuclear magnetic resonance spectroscopy |
| AGROVOC Term: | Fractionation |
| AGROVOC Term: | Methanol |
| AGROVOC Term: | Isoprene |
| AGROVOC Term: | Molecular weight |
| AGROVOC Term: | Fatty acids |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23325 |
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