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A polymer (/ˈpɒlɪmər/;[3][4] Greek poly-, "many" + -mer, "part") is a large molecule, or macromolecule, composed of many repeated subunits.[5] Due to their broad range of properties,[6] both synthetic and natural polymers play essential and ubiquitous roles in everyday life.[7] Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. Their consequently large molecular mass relative to small molecule compounds produces unique physical properties, including toughness, viscoelasticity, and a tendency to form glasses and semicrystalline structures rather than crystals. The terms polymer and resin are often synonymous with plastic.
The term "polymer" derives from the Greek word πολύς (polus, meaning "many, much") and μέρος (meros, meaning "part"), and refers to a molecule whose structure is composed of multiple repeating units, from which originates a characteristic of high relative molecular mass and attendant properties.[2] The units composing polymers derive, actually or conceptually, from molecules of low relative molecular mass.[2] The term was coined in 1833 by Jöns Jacob Berzelius, though with a definition distinct from the modern IUPAC definition.[8][9] The modern concept of polymers as covalently bonded macromolecular structures was proposed in 1920 by Hermann Staudinger,[10] who spent the next decade finding experimental evidence for this hypothesis.[11]
