An oligomer is a molecule that consists of a few monomer units. Macromolecule is used for individual molecules of high molecular weight and polymer is used to denote a substance composed of macromolecules. Oligomers are built from the same monomer units as polymers, but their chain is much shorter. Polymers in dilute solutions are characterized by the following types of interactions: solvent–solvent, solvent–polymer segment, polymer segment–segment, solvent–surface, and polymer segment–surface, whereas for oligomer segment–segment interaction and local entropy effects are small.
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