Abstract
Methyl 2,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared by hydrolysis of methyl 2,4-di-(2'-vinyloxyethoxy)benzylidenecyanoacetate (2). Diol 3 was condensed with 2,4-toluenediisocyanate and 3,3'-dimethoxy-4,4'-biphenylenediisocynate to yield polyurethanes 4 and 5 containing the NLO-chromophore 2,4-dioxybenzylidenecyanoacetate. The resulting polyurethanes were soluble in common organic solvents such as acetone and DMF. T g values of the polymers obtained from DSC thermograms were in the range of 101–114°C and electro-optic coefficient (r 33 ) of the poled polymer films was in the range of 12–15 pm/V at 633 nm. Polymers 4 and 5 showed a thermal stability up to 300°C in TGA thermograms, which is acceptable for NLO device applications.
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