1. In the present context, the term “structureless” simply implies absence of macrodefects in both components (e.g., cracks between impinged spherulites in semi-crystalline polymers, or polymer-free voids between filler particles in filled polymers), perfect adhesion on the interface between components being assumed
2. Lipatov YuS (ed) (1986) Physical Chemistry of Multi-Component Polymer Systems. Naukova Dumka, Kiev, vols 1 and 2 (in Russian)
3. Deryaguin BV, Churayev NV, Myuller VM (1987) Surface Forces. Nauka, Moscow, 399 p (in Russian)
4. Lipatov YuS (1977) Physical Chemistry of Filled Polymers. Khimia, Moscow, 303 p (in Russian)
5. Hence, Δr is, in fact, not so much an intrinsic property of each combination of two components, as rather an “effective parameter”, the numerical value of which will also heavily depend on the sensitivity and accuracy of the experimental technique used to measure the property of interest.