# What is the difference between structure and morphology in polymer blends?

When talking about polymer blends there is a difference between its structure and morphology, but I am not sure what it is. These two terms are used interchangeably in materials I use to study, but I don't see what is the difference if any.

Quote from my materials: "Properties of polymer blends are determined by component interactions and blend morphology." The next sentence: "Blend structure is determined by miscibillity of components."

• You better elaborate more about that... Aug 5 at 0:26
• Morphology and structure can be very ambiguous terms, meaning just about anything (shape, tacticity, molecular conformation, macromolecular or crystal arrangement). It would be nice to see a good ("canonical") answer from somebody knowledgeable. Aug 5 at 8:30
• You might want to check the IUPAC Compendium of Polymer Terminology and Nomenclature. Aug 5 at 8:53
• They appear to be used as synonyms in this context. It is a reference to the structure-function paradigm in the context of polymer blends, where chain structure has a role to play in determining miscibility and therefore phase structure. Aug 5 at 11:46

• Even for the (carbon based) polymers said to be crystalline, or to contain small local volumes with some regular, crystalline order, it is rare for polymers to have a unit cell-like local pattern which repeats itself in a predictable fashion multiple thousand times in the three directions of space by simple translation as observed, e.g., for $$\ce{NaCl}$$.
Thus structure (in the narrow sense) may be used to describe the spatial arrangement of polymer's atoms at a small scale (say a up to few $$\pu{10 Å}$$). On the other hand, in comparison of the former, morphology is about shape/form/organization at larger scale of length (even if still microscopic) as e.g., for spherulites, domains, grains including properties observable if many molecules are in one place e.g., to yield a rough (vs. a smooth) surface.