| 초록 |
Nonlinear optical (NLO) materials based on organic compounds have been extensively studied over the past decade because of their potential applications in the field of telecommunications, optical signal processing, and optical switching. Among the organic materials the NLO polymers are considered candidate materials, mainly because they offer many advantages such as light weight good processability to form optical devices. In the developments of NLO polymers for electro-optic device applications, stabilization of electrically induced dipole alignment is important considerations. Two approaches to minimize the randomization have been proposed. One is to use crosslinking method and the other is to utilize high Tg polymers such as polyimides. Polyimides are one of promising NLO materials because of their high Tg's which can be utilized to stabilize the dipole orientation of the NLO chromophore at high temperature. Another advantage of polyimides is their high thermal stability that enables them to survive at high temperatures during fabrication and operation in electro-optic devices. In this work we prepared novel polyimides containing dioxybenzylidenecyanoacetate, which is presumably effective NLO-chromophore. After confirming the structure of the resulting polymers we investigated their properties such as Tg, thermal stability and SHG activity. |
