Abstract
Abstract 1. Eyring's equation for the viscosity of a non-Newtonian fluid describes Mooney's data satisfactorily for all except the lowest shearing stress. 2. From the standpoint of the present theory, the behavior at low shearing stresses may most readily be explained by any of the following assumptions: (1) the moving particle is larger at low than at high shearing stresses; (2) the rubber as a whole is less oriented by the lower shearing stress; (3) the distance “jumped” at the low shearing stress may be less than that at high stresses. 3. According to the present interpretation, the moving particle (corresponding to the molecule of a simple liquid) is larger than the rubber molecule. It does not seem profitable to interpret this finding as evidence for the existence of a rubber micelle. 4. Both the activation energy of viscous flow for this particular sample of rubber, and the factor determined by the spatial requirements which must be fulfilled by the moving particle, are much larger than the analogous quantities for low molecular hydrocarbons.
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