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Carbamate polymerization comprises polymer-forming reactions that place carbamate, commonly called urethane, groups, –NH–C(=O)–O–, within the repeating structure. The conventional route is step-growth polyaddition between polyfunctional isocyanates and polyols; alcohol addition to an isocyanate forms the urethane bond without eliminating a small molecule, and monomer functionality determines whether the product is linear, branched, or crosslinked ^[1]. Because amines react with isocyanates to form urea groups, polymers containing predominantly –NH–C(=O)–NH– linkages are polyureas rather than polycarbamates. Non-isocyanate routes, including reactions of cyclic carbonates with polyamines, also generate polyhydroxyurethanes and remain within the class because the backbone contains carbamate linkages ^[2]. The concept is defined by repeat-unit constitution, not by a single mechanism: it is distinct from polyesterification, polyamidation, and polycarbonate synthesis, which respectively form ester, amide, and carbonate linkages.