p-(2-Vinyloxyethoxy)benzylidenemalononitrile 3 and methyl p-(2-vinyloxyethoxy)benzylidenecyanoacetate 4 was prepared by the condensations of p-(2-vinyloxyethoxy)benzaldehyde 2 with malononitrile and methyl cyanoacetate, respectively. Monomers 3 and 4 were polymerized with cationic initiators to obtain polymers with the NLO-phores p-oxybenzylidenemalononitrile and p-oxycyanocinnamate in the side chain. The resulting polymer 6 was soluble in acetone but the polymer 5 was not soluble in common solvents. The inherent viscosities of polymer 6 were in the range of 0.20-0.30 dL/g in acetone. Solution-cast films were clear and brittle, showing T-g values in the range of 61-70 degrees C.