Citation
Hasma H., . and Othman H., . and Masahuling B., . and Muniandy V., . and Eng A. H., . and Kawahara S., . and Ramli O., . Some properties of natural rubber from latex-timber clones. pp. 164-176. ISSN 1511-1768
Abstract
Several properties of natural rubber from latex-timber clones which produce high timber and latex yields were examined. Of the 28 clones 14 clones were found to produce high dry rubber content (DRC lances i.e. above 41 most of which were from the RRIM 2000 series. No latices were found to have a DRC below 34. Except for Mooney viscosity all the clonal rubbers could satisfy the specifications of SMR-CV scheme. The Mooney viscosity of 15 clonal rubbers was observed to exceed the limit specified in the SMR-CV 60 scheme. However the viscosity of such rubbers can be reduced by blending the latices with other latices having low viscosity rubbers before processing them into dry rubbers. The molecular weight distributions of the clonal rubbers were either unimodal with a peak in high molecular weight region or bimodal with a small peak in the low molecular weight region. On account of this the polydispersity 3.15.4 was narrower than the range of 2.510 reported previously. The number average and weight average molecular weights of the rubber were found to be in the range of 2.77 1O5 - 7.06 105 and 1.50 106 2.34 106 respectively. The correlations between Mooney viscosity and Wallace plasticity Mooney viscosity and molecular weight were also found.
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Abstract
Several properties of natural rubber from latex-timber clones which produce high timber and latex yields were examined. Of the 28 clones 14 clones were found to produce high dry rubber content (DRC lances i.e. above 41 most of which were from the RRIM 2000 series. No latices were found to have a DRC below 34. Except for Mooney viscosity all the clonal rubbers could satisfy the specifications of SMR-CV scheme. The Mooney viscosity of 15 clonal rubbers was observed to exceed the limit specified in the SMR-CV 60 scheme. However the viscosity of such rubbers can be reduced by blending the latices with other latices having low viscosity rubbers before processing them into dry rubbers. The molecular weight distributions of the clonal rubbers were either unimodal with a peak in high molecular weight region or bimodal with a small peak in the low molecular weight region. On account of this the polydispersity 3.15.4 was narrower than the range of 2.510 reported previously. The number average and weight average molecular weights of the rubber were found to be in the range of 2.77 1O5 - 7.06 105 and 1.50 106 2.34 106 respectively. The correlations between Mooney viscosity and Wallace plasticity Mooney viscosity and molecular weight were also found.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Latex |
| AGROVOC Term: | Clones |
| AGROVOC Term: | Yields |
| AGROVOC Term: | Timber |
| AGROVOC Term: | Viscosity |
| AGROVOC Term: | Clonal variation |
| AGROVOC Term: | Blending |
| AGROVOC Term: | Processing |
| AGROVOC Term: | Molecular weight |
| Geographical Term: | Malaysia |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 28 Apr 2025 03:24 |
| URI: | http://webagris.upm.edu.my/id/eprint/23197 |
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