endo-N-Benzylbicyclo[2,2,1]hept-2-ene-5,6-dicarboximide (BZN orendo-BZN), one of the norbornene derivatives, was prepared fromN-benzylmaleimide (BZMI) and cyclopentadiene (CPD) according to the Diels-Alder reaction. Yields of homopolymers, insoluble in methanol, were about 20 wt%. No BZN could be polymerized in bulk without radical catalysts under 220°C. At 220°C for 1 h,endo-BZN was converted toexo-BZN in a 50-mol% yield. the polymerization of BZN over 300°C for 1 h gave the polymer in about 100% yield. It was found that the polymer consisted of a mixture of BZN, BZMI, and an adduct obtained from BZN and CPD. BZN was copolymerized with styrene, methyl methacrylate, and vinyl acetate with radical initiators. the copolymerizabilities of BZN with VAc were better than those for other systems. the monomer reactivity ratios and Alfrey-PriceQ-evalues were determined.