Citation
Eng A. H., . and Tangpakdee Jitladda, . and Kawahara S., . and Tanaka Y., . Distribution and origin of abnormal groups in natural rubber. pp. 11-20. ISSN 0127-7065
Abstract
Ester and aldehyde groups are found to remain in natural rubber even after purification by deproteinisation and acetone extraction. Rubber isolated from smaller latex particles in the serum fraction contains a lower level of ester group than that from larger latex particles. Both aldehyde and ester groups are found to have a similar distribution in fractionated natural rubbers of different molecular weights. The concentration of these groups decreases with decreasing molecular weight of the rubbers. This finding suggests that the aldehyde groups are not derived from oxidative degradation of natural rubber. A drastic reduction in aldehyde content of natural rubber after transesterification is observed showing that the aldehyde groups are derived from oxidative degradation of olefinic group of unsaturated fatty acids bonded to the rubber molecule.
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Abstract
Ester and aldehyde groups are found to remain in natural rubber even after purification by deproteinisation and acetone extraction. Rubber isolated from smaller latex particles in the serum fraction contains a lower level of ester group than that from larger latex particles. Both aldehyde and ester groups are found to have a similar distribution in fractionated natural rubbers of different molecular weights. The concentration of these groups decreases with decreasing molecular weight of the rubbers. This finding suggests that the aldehyde groups are not derived from oxidative degradation of natural rubber. A drastic reduction in aldehyde content of natural rubber after transesterification is observed showing that the aldehyde groups are derived from oxidative degradation of olefinic group of unsaturated fatty acids bonded to the rubber molecule.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Cross-linking |
| AGROVOC Term: | Purification |
| AGROVOC Term: | Isolation |
| AGROVOC Term: | Esters |
| AGROVOC Term: | Methanol |
| AGROVOC Term: | Aldehydes |
| AGROVOC Term: | Acetaldehyde |
| AGROVOC Term: | Sulphuric acid |
| AGROVOC Term: | Toluene |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23332 |
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