| 초록 |
Polymereric materials with nonlinear optical (NLO) activity are considered as a promising candidate for making electro-optic (EO) devices, mainly because they offer many advantages such as light weight, chemical resistance, and good processability to form EO devices. There are tremendous challenges in designing polymers of large NLO effects. Polyesters and polyamides containing the chromophoric main chain were prepared. Various polymers with the NLO-chromophores in the side chain such as poly(meth)acrylates and polyurethane were also reported. In this work we prepared novel polyesters containing dioxynitrostilbenyl unit as a NLO-chromophore. 3,4-Di-(2-hydroxyethoxy)-4-nitrostilbene (2) was prepared by the reaction of 2-iodoethanol with 3,4-dihydroxy-4-nitrostilbene (1). Diol 2 was condensed with terephthaloyl chloride, adipoyl chloride, and sebacoyl chloride to yield novel Y-type polyesters (3-5) containing the NLO-chromophores dioxynitrostilbenyl groups, which are parts of polymer backbones. The chemical structures of the polymers were identified by 1H NMR, IR spectra, and elemental analysis. All the analytical data were matched well with the expected chemical structure. Polymers 3-5 were soluble in common organic solvents such as acetone and DMF. These polymers showed a thermal stability up to 300oC in TGA thermograms with glass transition temperature (Tg) values in the range of 112-152oC in DSC thermograms. SHG activities, film morphology, and electro-optic properties of the polymers are in progress. |
