Epoxide groups in natural rubber. II. C-NMR study of undegraded natural rubber


Citation

Eng A.H., . and Kodoma S., . and Tangpakdee J., . and Kawahara S., . and Tanaka Y., . Epoxide groups in natural rubber. II. C-NMR study of undegraded natural rubber. 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 isoperene 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 isoperene units. It is concluded that natural rubber has no detectable amount of epoxide groups on the main-chain molecule.

Additional Metadata

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Item Type: Article
Additional Information: Summary (En)
AGROVOC Term: RUBBER
AGROVOC Term: CHEMICOPHYSICAL PROPERTIES
AGROVOC Term: SPECTROMETRY
AGROVOC Term: MOLECULAR WEIGHT
AGROVOC Term: CLONES
AGROVOC Term: FRACTIONATION
AGROVOC Term: CENTRIFUGING CAUCHO
AGROVOC Term: PROPIEDADES FISICOQUIMICAS
AGROVOC Term: ESPECTROMETRIA
AGROVOC Term: PESO MOLECULAR
Depositing User: Ms. Norfaezah Khomsan
Last Modified: 24 Apr 2025 05:52
URI: http://webagris.upm.edu.my/id/eprint/17699

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