| Autor: |
Lim Hui Mei Evelyn,, Misni Misran |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
ASM Science Journal, Vol 11, Iss 1, Pp 44-55 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
1823-6782 |
| Popis: |
Surfactants are important class of material used in latexes to impart stability at the solid/liquid interface. Ionic surfactants and nonionic surfactants are known to provide electrostatic and steric stabilization. In this study, two surfactants having chain length of twelve hydrocarbons were added to the natural rubber latex (NRL) respectively to determine its zeta potential values, adsorption isotherm and rheological properties. The zeta potential magnitude of NRL in the presence of sodium dodecyl sulphate increased as its concentration increases, while polyoxyethylene dodecyl ether did not show a significant change in zeta potential. The isotherms were of Langmuir Type 1, the amount of surfactant adsorbed per unit area at the plateau region was 6.0 10-6 mol m-2 for sodium dodecyl sulphate and 2.1 10-6 mol m-2 for polyoxyethylene dodecyl ether. The elastic modulus and relative viscosity of the NRL suspensions increased significantly in the presence of sodium dodecyl sulphate and also with polyoxyethylene dodecyl ether as compared to the NRL system. The maximum packing volume fractions of the NRL stabilized with sodium dodecyl sulphate and polyoxyethylene dodecyl ether were found to be lower than NRL itself. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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