Copolymers of 5-methylenebicyclo(2.2.1)-2-heptene and maleic anhydride were prepared by free radical copolymerization. Copolymers of constant composition with an alternating arrangement of comonomers but of varying solubilities, degrees of cross-linking, and molecular weights were obtained. The effects of comonomer feed ratios, comonomer concentration, initiator concentration, and temperature were studied. Copolymers of 5-methylenebicyclo(2.2.1)-2-heptene and maleimide, bicyclo(2.2.1)-2,5-heptadiene and maleic anhydride, and 1,2,3,4,4a,5,8,8a-octahydro-2-methylene-l,4,5,8dimethanonaphthalene and maleic anhydride were also investigated.