Citation
Sambhi M. S., . An analysis of the Plasticity Retention Index of the Standard Malaysian Rubber Scheme. pp. 133-140. ISSN 0127-7065
Abstract
Molecular degradation is the main process occurring during the Plasticity Retention Index PRI) test of commercial grades of raw natural rubber. The relationship between Wallace plasticities and number-average degrees of polymerisation allows one to express the PRI in terms of number-average degrees of polymerisation. The degradation data for a number of commercial grades of natural rubber can be represented by typical first-order type of kinetic equations. For such rubbers the dependence of PRI on the initial Wallace plasticity and the chain scission rate constant is determined. A generalised treatment of the factors that influence the PRI value is presented and some of the empirical observations made with regard to the PRI are rationalised. The effectiveness of the PRI as a measure of the susceptibility of raw natural rubber is gauged.
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Abstract
Molecular degradation is the main process occurring during the Plasticity Retention Index PRI) test of commercial grades of raw natural rubber. The relationship between Wallace plasticities and number-average degrees of polymerisation allows one to express the PRI in terms of number-average degrees of polymerisation. The degradation data for a number of commercial grades of natural rubber can be represented by typical first-order type of kinetic equations. For such rubbers the dependence of PRI on the initial Wallace plasticity and the chain scission rate constant is determined. A generalised treatment of the factors that influence the PRI value is presented and some of the empirical observations made with regard to the PRI are rationalised. The effectiveness of the PRI as a measure of the susceptibility of raw natural rubber is gauged.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Natural rubber |
| AGROVOC Term: | Raw materials |
| AGROVOC Term: | Polymerization |
| AGROVOC Term: | Oxidation |
| AGROVOC Term: | Degradation |
| AGROVOC Term: | Plasticity |
| AGROVOC Term: | Standards |
| AGROVOC Term: | Ageing |
| AGROVOC Term: | analysis |
| Geographical Term: | Malaysia |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 28 Apr 2025 04:44 |
| URI: | http://webagris.upm.edu.my/id/eprint/23526 |
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