Preparation of poly(alkylvinylether)s for nonlinear optical applications

Summary

3′,5′-Dimethoxy-4′-(2-vinyloxyethoxy)-4-nitrostilbene 2 and 3′,5′-dimethoxy-4′-(2-vinyloxyethoxy)-2,4-dinitrostilbene 5 were prepared by the reactions of 2-iodoethyl vinyl ether with 3′,5′-dimethoxy-4′-hydroxy-4-dinitrostilbene 1 and 3′,5′-dimethoxy-4′-hydroxy-2,4-dinitrostilbene 4, respectively. Monomers 2 and 5 were polymerized with cationic initiators to obtain polymers with the NLO-phores 3′,5′-dimethoxy-4′-oxy-4-nitrostilbene and 3′,5′-dimethoxy-4′-oxy-2,4-nitrostilbene in the side chain. The resulting polymer 3 and 6 were soluble in DMSO and DMF. The inherent viscosities of polymers were in the range of 0.28–0.33 dL/g in DMSO. Polymers 3 and 6 showed good thermal stabilities in their TGA thermograms, and the T_g values from DSC thermograms were in the range of 81–87°C.