Citation
Tangpakdee Jitladda, . and Tanaka Yasuyuki, . Why rubber trees produce polyisoprene - a possible role of natural rubber in the Hevea tree. pp. 77-83. ISSN 1511-1768
Abstract
A possible role of rubber in the Hevea brasiliensis tree was presumed based on the analysis of structural changes of rubber during storage in the rubber tree as latex. The rubber obtained from a previously untapped mature-tree a so-called virgin mature-tree (Vir-NR) contained a gel fraction higher than 80. The gel fraction showed almost the same structure as a crosslinked rubber prepared from fresh latex in the presence of peroxide with the molecular weight of a primary segment between crosslinks (Mc) of 3 103. The sol fraction from Vir-NR was an oxidative degraded product containing aldehyde and epoxide groups. The gel fraction from a regularly tapped mature-tree (Reg-NR) was less than 3 and was loosely crosslinked with hydrogen bondings and ester linkages having MC of 7 105. These indicate that rubber accepts radicals to form C-C crosslinking and partly oxidative degradation products in laticiferous tubes of Hevea tree during storage suggesting a possible role of rubber as a scavenger of hydroxy radicals in latex.
Download File
Full text available from:
Official URL: http://vitaldoc.lgm.gov.my:8060/vital/access/servi...
|
Abstract
A possible role of rubber in the Hevea brasiliensis tree was presumed based on the analysis of structural changes of rubber during storage in the rubber tree as latex. The rubber obtained from a previously untapped mature-tree a so-called virgin mature-tree (Vir-NR) contained a gel fraction higher than 80. The gel fraction showed almost the same structure as a crosslinked rubber prepared from fresh latex in the presence of peroxide with the molecular weight of a primary segment between crosslinks (Mc) of 3 103. The sol fraction from Vir-NR was an oxidative degraded product containing aldehyde and epoxide groups. The gel fraction from a regularly tapped mature-tree (Reg-NR) was less than 3 and was loosely crosslinked with hydrogen bondings and ester linkages having MC of 7 105. These indicate that rubber accepts radicals to form C-C crosslinking and partly oxidative degradation products in laticiferous tubes of Hevea tree during storage suggesting a possible role of rubber as a scavenger of hydroxy radicals in latex.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Hevea |
| AGROVOC Term: | Hevea brasiliensis |
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Tapping |
| AGROVOC Term: | Purification |
| AGROVOC Term: | Centrifugation |
| AGROVOC Term: | Degradation |
| AGROVOC Term: | Gels |
| AGROVOC Term: | Acetone |
| AGROVOC Term: | Methanol |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23314 |
Actions (login required)
 |
View Item |
