Citation
Bristow G. M., . Influence of grade of natural rubber on reversion behaviour. pp. 137-151. ISSN 0127-7065
Abstract
The reversion behaviour of fifty samples of natural rubber compounded in a conventional cure system (2.5 p.p.h.r. sulphur 0.5 p.p.h.r. CBS) has been studied by oscillating disc rheometry at 160 C - 180 C. Over all the samples the reversion rate varied by a factor of ca. 1.8. Further while there was considerable scatter on an average field coagulum grades such as TSR 20 reverted some 14 faster than grades such as RSS and SMR CV which are prepared by the acid coagulation of latex. The same feature was evident in more limited studies at 100C - 120C. The dependence of reversion rate on temperature conforms to the Arrhenius relation with an activation energy of ca. 104 kJ/mol independent of grade. This value is ca. 10 greater than the activation energy for vulcanisation for which published values are ca. 95 kJ/mol. The rate of reversion decreases with time and the activation energy depends on the extent of reversion. Hence like vulcanisation reversion is presumably a complex process. The possibility is mooted that reversion rate assessed in this manner could be used as a further measure of natural rubber quality.
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Abstract
The reversion behaviour of fifty samples of natural rubber compounded in a conventional cure system (2.5 p.p.h.r. sulphur 0.5 p.p.h.r. CBS) has been studied by oscillating disc rheometry at 160 C - 180 C. Over all the samples the reversion rate varied by a factor of ca. 1.8. Further while there was considerable scatter on an average field coagulum grades such as TSR 20 reverted some 14 faster than grades such as RSS and SMR CV which are prepared by the acid coagulation of latex. The same feature was evident in more limited studies at 100C - 120C. The dependence of reversion rate on temperature conforms to the Arrhenius relation with an activation energy of ca. 104 kJ/mol independent of grade. This value is ca. 10 greater than the activation energy for vulcanisation for which published values are ca. 95 kJ/mol. The rate of reversion decreases with time and the activation energy depends on the extent of reversion. Hence like vulcanisation reversion is presumably a complex process. The possibility is mooted that reversion rate assessed in this manner could be used as a further measure of natural rubber quality.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Latex |
| AGROVOC Term: | Deterioration |
| AGROVOC Term: | Physical properties |
| AGROVOC Term: | Temperature |
| AGROVOC Term: | Coagulation |
| AGROVOC Term: | Formulations |
| AGROVOC Term: | Vulcanization |
| AGROVOC Term: | Grading |
| AGROVOC Term: | Plant quality |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:28 |
| URI: | http://webagris.upm.edu.my/id/eprint/23481 |
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