ABSTRACT
This chapter presents the thermodynamics of mixing molecules that have strong specific interactions. It describes the mixing of hydrogen bonded chains of small molecules we established a methodology that depended upon the determination of the probability that a mixture of A and B monomers would spontaneously occur in a configuration equivalent to that of the hydrogen bonded system. Association models, however, start with the assumption of a prior knowledge of the equilibrium distribution of associated species present at a given temperature and composition. The great advantage of association models is the relatively simple way in which partition functions can be constructed. The free energy of disorienting and mixing the monomers and dimers, with one another is then determined using Flory's equations, thus obtaining a free energy relative to the separate and oriented reference state. Infrared frequency shifts indicate that is a good assumption for the temperature range accessible to most polymers.
