I need to calculate the interfacial tension between three pairs of polymers from the molten state at 300 °C, and I know that the harmonic mean equation is an excellent way to get close values to those from experimental ones. How can I do this approximation?
Maybe you want to consider the classic equation proposed by L.A. Girifalco and R.J. Good (1957): "A theory for the estimation of surface and interfacial energies. I. Derivation and application to interfacial tension", J. Phys. Chem., 61(7), 904–909; DOI: 10.1021/j150553a013
The following RG discussion addresses the temperature dependency and the interrelationship between both surface tension and viscosity, for polymers:
https://www.researchgate.net/post/Is_there_any_direct_relation_between_surface_tension_viscosity_and_temperature
For a somewhat related RG discussion, you may want to check also: https://www.researchgate.net/post/Is_there_any_relationship_between_the_inter_facial_tension_and_the_surface_tension_of_liquids
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