| 초록 |
In the developments of nonlinear optical (NLO) polymers, stabilization of electrically-induced dipole alignment is one of important criteria. The polyurethane matrix forms extensive hydrogen bonding between urethane linkage and increases rigidity preventing the relaxation of induced dipoles. In this work we prepared novel polyurethanes containing 1-(2,4-dioxyethoxy)phenyl)-2-{5-(2,2,3-tricyanovinyl)-2-thiophenyl)}ethenyl groups as NLO-chromophores. We selected the latter because they have large dipole moment and are rather easy to synthesize. Furthermore they constitute novel Y-type NLO polyurethanes, and these Y-type NLO polyurethanes have not yet been presented in the literature. These mid-type NLO polymers are expected to have both the merits of main-chain and side chain-NLO polymers namely stabilization of dipole alignment and good solubility. After confirming the structure of the resulting polymers, we will investigated their nonlinear optical properties. |
