AbstractA practical model for polymeranalogous reactions is ethylene‐vinyl alcohol copolymer with a controllable amount of hydroxylic groups. The reaction of the hydroxyl groups with various compounds leads to further functionalized polymers. The functional groups introduced are useful for modification or crosslinking reactions. The modification of ethylene‐vinyl alcohol copolymers with carboxylic anhydrides and hydroxy carboxylic acids is the main subject of this investigation. The crosslinking reaction of these products with bifunctional epoxies was followed by means of viscosimetric measurements. The dependence of the reaction behaviour on the structure of the functionalized polymers used is discussed.