| 초록 |
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 1-(2,4-dioxyethoxy)phenyl)-2-{5-(2,2,3-tricyanovinyl)-2-thiophenyl)}ethenyl groups 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: stabilization of dipole alignment and good solubility. After confirming the structure of the resulting polymers, we will investigated their nonlinear optical properties. |
