A study has been made of mechanical properties of n-heptyl methacrylate copolymers slightly crosslinked by dimethacrylic esters of various glycols, in which the number of atoms of elements in the main chain was the same in all cases. It was found that when “hinge” atoms of oxygen are incorporated in main chains of the glycols, crosslinks (bridges) in the sparsely crosslinked copolymers acquire a high degree of elasticity, which lowers their softening points T s and influences their deformation-strength properties. If n-propyl groups, having a plasticizing action, are then additionally incorporated in the glycol side chains, a further reduction in the level of deformation-strength properties of the copolymers is observed.