Linear viscoelasticity as a conceptual background for the mixing of rubber

3 Linear viscoelasticity as a conceptual background for the mixing of rubber 

Different deformational measurements are used to obtain linear viscoelastic data. It may be in simple shear or in elongation. However, the behaviour of rubber during 

There are two important answers to satisfy the question one is that the information obtained for a given gum rubber with the above measurements are all related and that from the result of one type of measurement, the result of any other type of measurement, can be calculated. The implication is that if one type of measurement is made then everything about a given gum rubber is known with respect to its linear viscoelastic behaviour. The information is, of course, limited to the range of time scale and the range of temperature of observation. 

The other importance is the additivity of the memory. That is, using shear stress relaxation as an example, the cumulative memory of stresses imposed at different times may be calculated with a theory of Boltzmann s superposition principle. 

The implication of these two statements is profound. When the separability of time and strain holds for a given gum rubber, subsequent linearisation of the data enables one to describe the behaviour of a gum rubber under any situation, at least in principle. This means that with the understanding of linear viscoelasticity plus the parameters for linearisation, there is adequate information for diagnosing processing problems. 

---