PRI ageing and some related properties of constant viscosity natural rubbers (Record no. 65683)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 01888nam a2200217Ia 4500 |
| 100 ## - MAIN ENTRY--AUTHOR NAME | |
| Personal name | Eng A H |
| 245 #0 - TITLE STATEMENT | |
| Title | PRI ageing and some related properties of constant viscosity natural rubbers |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Name of publisher | Journal of Rubber Research |
| Year of publication | 2002 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 199-208 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc | Constant viscosity natural rubber (NR) samples from different clones showed no correlation between copper content and Plasticity Retention Index (PRI) value. When the NR samples were stabilised with hydroxylamine, the degree of storage hardening was low but the PRI remained high. The gel content of the NR samples decreased significantly after the PRI test. The extent of reduction in gel content was much greater than that of the reduction in molecular weight of the NR samples. This was attributed to the denaturation of the proteins, which led to the disintegration of crosslinks, or higher rate of oxidation due to the presence of a high level of metal ions in the gel. The extent of molecular weight reduction was slightly lower than that of plasticity value. The Wallace plasticity could be correlated with the geometrical mean of Mn and Mw, i.e, (MnMw)1/2. The correlations obtained from linear regression before and after PRI ageing were quite comparable probably because the NR samples were processed and aged under the same conditions. Activation energy of oxidation (AEO) determined by differential scanning calorimeter provided a more sensitive method of assessing the ageing resistance of NR samples than PRI. However, the correlation between PRI and AEO was insignificant. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Constant viscosity |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Copper content |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Differential scanning calorimeter |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Hydroxylamine |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Molecular weight |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Wallace plasticity |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Chang C F |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Kawahara S |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | Journals |
| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Serial Enumeration / chronology | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Journals | RRII Library | RRII Library | Rubber chemistry | 22/04/2003 | Volume 5, Issue 4 | Journals |