Urethane macromers were prepared by reacting tolylene diisocyanate with various glycols, followed by end capping with 2-hydroxyethyl methacrylate in the presence of dibutyltin dilaurate as the catalyst. Various proportions of styrene to the urethane-methacrylate macromer were adopted to cure at 70 degreesC for 7-8 h. The effect of the composition on the properties was systematically studied. These transparent materials exhibited excellent mechanical and optical properties and heat deflection temperature. All of the copolymer sheets had a transmittance similar to the poly(methyl methacrylate) sheet and had a rather high refractive index. The mechanical and thermal properties varied with the ratio of styrene to macromer and with the kind of glycol used in the synthesis of the macromer.