Abstract
An experimental study is reported of phase equilibria in ternary systems comprising two polymers and one liquid. The measured distribution of the two polymers between two coexisting phases is used, in conjunction with the Flory-Huggins theory, to derive polymer-polymer interaction ‘constants’. These can be used to predict the miscibility and heat of mixing of the same polymers in binary mixtures. Experimental studies on fluid polymers show that miscibility is less and heat of mixing larger than predicted. It is concluded that these studies on ternary systems do not afford a reliable guide to the behaviour of binary polymers mixtures. Possible reasons for the discrepancy are discussed.
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