Entropy values pairing theories

Measurement of Kd for any ion pair using the Fuoss formulation enables the degree of dissociation of that pair to be assessed, and this knowledge is essential in evaluating reactivity. The theory automatically provides a value for A0 for the salt and, if Kd is determined at a series of temperatures, then the corresponding enthalpy and entropy of dissociation can also be calculated. Use of the Denison and Ramsey equation then conveniently provides for an estimate of Kd in other... 

It is possible to simulate the spinodal curves of the phase diagram of polymer pairs using the Equation-of-state theory developed by Flory and co-workers. It is only, however, possible to do this using the adjustable non-combinatorial entropy parameter, Qjj. Another problem arises in the choice of a value for the interaction parameter Xjj. This is introduced into the theory as a temperature independent constant whereas we know that in many cases the heat of mixing, and hence is strongly temperature dependent. The problem arises because Xj was never intended to describe the interaction between two polymers which are dominated by a temperature dependent specific interaction. 

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