Design and preparation of side chain electro-optic polymeric materials based on novel organic second order nonlinear optical chromophores with double carboxyl groups

Organic second nonlinear optical chromophore GL-COOHs with two carboxyl groups are designed and synthesized in this paper. The structure of chromophore GL-COOHs are characterized by mass spectrum and nuclear magnetic resonance spectroscopy. The first order hyperpolarizability is studied by theoretical calculation, which is similar to the famous FTC chromophore. Thanks to the double carboxyl group structure, novel side chain polyester electro optic polymers are prepared based on chromophore GL-COOHs. Their Tgs are around 110 A degrees C, which is high enough for keeping the long term stability of their electro optic activities. Their Tds are above 239 A degrees C, which is high enough for the devices preparing process. Else, the largest d(33) values are about 29.3, 43.6 and 63.1 pm/V for polymer GL-S-1, GL-S-2 and GL-S-3 respectively. Interestingly, there is a linear relation between chromophore loading density and d(33) values.