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A polymer (/ËpÉlÉ¨mÉr/) (Greek poly- , many + -mer, parts) is a large molecule, or macromolecule, composed of many repeated subunits.
Polymers are a class of synthetic substances composed of multiples of simpler units called monomers. Polymers are chains with an unspecified number of monomeric units. Homopolymers are polymers made by joining together monomers of the same chemical composition or structure.