Mooney Viscosity of Carbon Black-Rubber Mixtures
| Autor: | Merton L. Studebaker |
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| Rok vydání: | 1957 |
| Předmět: | |
| Zdroj: | Rubber Chemistry and Technology. 30:141-156 |
| ISSN: | 1943-4804 0035-9475 |
| DOI: | 10.5254/1.3542658 |
| Popis: | The principal properties of carbon black which must be considered in the study of rubber mixtures containing carbon black are (1) particle size and the related property, (2) surface area, (3) hydrogen content, (4) oxygen content, and finally a property which is more difficult to evaluate but which is related to (5) the tendency to agglomerate. This latter term is referred to in the trade as a “structure” factor, and it is usually determined from oil absorption measurements. Unvulcanized rubber-carbon black mixtures are considered to be analogous to mixtures of carbon black and with other liquid media, for example, mineral oil. It has been demonstrated by Weltmann and Green that the “plastic viscosities” of concentrated suspensions obey a modified “Arrhenius equation”. In this paper it is shown that unvulcanized rubber-carbon black mixtures also obey a similar equation. The rheological properties of concentrated suspensions are profoundly influenced by long-range London-van der Waals forces. Some of the laboratory tests by which these forces are studied by colloid chemists are specific volume of a powdered solid under pressure, sedimentation volume, oil absorption, and plasticity. A correlation is demonstrated between data obtained by these tests and Mooney viscosity. A general equation is presented relating the Mooney viscosity with the concentration of carbon black and oil absorption. This equation applies to all of the data which have been examined in natural rubber. In GR-S another term, the oxygen content of the carbon black, must be included. |
| Databáze: | OpenAIRE |
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