Synthesis of Polyurethanes Containing Dioxybenzylidenecyanoacetate as a NLO-Chromophore and Their Properties

Abstract

Methyl 3,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate 3 was prepared and condensed with 2,4-toluenediisocyanate and 3,3'-dimethoxy-4,4'-biphenylenediisocyanate to yield polyurethanes 4 and 5 containing the NLO-phore dioxybenzylidenecyanoacetate group. The resulting polyurethanes 4-5 were soluble in common organic solvents. Polymers 4-5 showed a thermal stability up to 290°C in TGA thermograms with T g values in the range of 97-102°C in DSC thermograms. The SHG coefficients (d 33 ) of poled polymer films were 4.7×10 −9 esu.