Abstract
Abstract The expression “polymer blends and alloys” is widely used at present. However, until now there is no precise wording to describe what kind of binary or multicomponent mixtures should be referred to as “polymer alloy” and what kind of “polymer blend.” Even in the recently published superb and fundamental book by Utracki,1 only qualitative descriptions are given. Our aim is to propose definitions of the concepts “polymer alloy” and “polymer blend” based on thermodynamic considerations, taking as a basis the analysis of phase diagrams of binary mixtures.
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