_________________________________________________________________________ AbstractNovel fluoro and oxy ring-disubstituted isopropyl phenylcyanoacrylates, RPhCH=C(CN)CO2CH(CH3)2 (where R is 2-fluoro-3-methoxy, 2-fluoro-4-methoxy, 2fluoro-5-methoxy, 2-fluoro-6-methoxy, 3-fluoro-4-methoxy, 4-fluoro-3-methoxy, 5-fluoro-2-methoxy, 4-fluoro-3-phenoxy) were prepared and copolymerized with styrene. The monomers were synthesized by the piperidine catalyzed Knoevenagel condensation of ringsubstituted benzaldehydes and isopropyl cyanoacetate and characterized by CHN elemental analysis, IR, 1 H-and 13 C-NMR. All the ethylenes were copolymerized with styrene in solution with radical initiation (ABCN) at 70C. The composition of the copolymers was 2 calculated from nitrogen analysis, and the structures were analyzed by IR, 1 H and 13 C-NMR, GPC, DSC, and TGA.