Citation
Tangpakdee Jitladda, . and Tanaka Yasuyuki, . Branching in natural rubber. pp. 14-21. ISSN 1511-1768
Abstract
The number of branch-points in natural rubber (NR) was analysed for the rubber from deproteinised fresh field (FL) and high-ammonia (HA) latices using 13C-NMR and osmometric measurement before and after transesterification of the rubber. About two branch-points per chain was found for the rubber from FL-latex and two to five by increasing M in proportion to that of HA-latex. The Huggins k constants of the fractionated transesterified rubbers were lower than that of the original rubbers. The Mw and Mn values of each fraction decreased by about 10 - 50 after transesterification. The gel content of rubber from HA-latex was decreased from 55 to 15 after deproteinisation and further decreased to 1 after transesterification. The most part of gel in NR was presumed to be formed from some functional groups in NR by aggregation reaction with proteins. The branch-points are originated from other functional groups in NR presumably such as phospholipids.
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Abstract
The number of branch-points in natural rubber (NR) was analysed for the rubber from deproteinised fresh field (FL) and high-ammonia (HA) latices using 13C-NMR and osmometric measurement before and after transesterification of the rubber. About two branch-points per chain was found for the rubber from FL-latex and two to five by increasing M in proportion to that of HA-latex. The Huggins k constants of the fractionated transesterified rubbers were lower than that of the original rubbers. The Mw and Mn values of each fraction decreased by about 10 - 50 after transesterification. The gel content of rubber from HA-latex was decreased from 55 to 15 after deproteinisation and further decreased to 1 after transesterification. The most part of gel in NR was presumed to be formed from some functional groups in NR by aggregation reaction with proteins. The branch-points are originated from other functional groups in NR presumably such as phospholipids.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Latex |
| AGROVOC Term: | Branching |
| AGROVOC Term: | Filtering |
| AGROVOC Term: | Solvents |
| AGROVOC Term: | Decomposition |
| AGROVOC Term: | Flow rate |
| AGROVOC Term: | Polystyrene |
| AGROVOC Term: | Measurement |
| AGROVOC Term: | Calibration |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23309 |
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