ABSTRACT A novel reactive polymer containing cyanate groups in the side chain was prepared by free radical polymerization of a cyanate-containing monomer, 2-(4- cyanatophenyl) ethyl methacrylate (1). The monomer 1 and its polymer, poly [2-(4- cyanatophenyl) ethyl methacrylate](PCPMA), were stable under the air for a long period. The copolymerization of 1 and methyl methacrylate provided the corresponding copolymers ...