Nonlinear optical polyimide with high thermal stability prepared by simultaneous poling and polymerization  

作　　者：Hu Kang Wei Wu Peiji Wu Cheng Ye 

机构地区：[1]Chinese Acad Sci, Ctr Mol Sci, Organ Solids Lab, Beijing 100080, Peoples R China

出　　处：《Chinese Science Bulletin》2001年第10期827-831,共5页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 59790050-3 and 29704009) ;and the National "863" Program (Grant No. 863-715-002-0120).

摘　　要：The high Tg polyimide embedded with a novel imidazol-typed chromophore 2-[5-(4-nitrostilbenyl)thienyl]-4,S-di(4-aniinophenyl)imidazole (NSTDAPI) was prepared using the 'simultaneous poling and polymerization' technique. The glass transition temperature (Fg) is 304℃ and the initial decomposition temperature (Td) is 330℃. The in-situ second harmonic generation (in-situ SHG) measurement was performed to study its poling behavior and the stability of the poling-induced orientation. The nonlinear optical (NLO) coefficient d33 of poled polyimide film is 32.2 pm/V at 1064 nm fundamental wavelength. The SHG signal of the poled polymer film was quite stable below 200℃, and then began to decay rapidly above 220℃. The half-decay temperature of dipole orientation for the film is 250℃.The highT g polyimide embedded with a novel imidazol-typed chromophore 2-[5-(4-nitrostilbenyl)thienyl]-4,5-di(4-aminophenyl)imidazole (NSTDAPI) was prepared using the “simultaneous poling and polymerization” technique. The glass transition temperature (T g ) is 304° C and the initial decomposition temperature (T d ) is 330° C. Thein-situ second harmonic generation (in-situ SHG) measurement was performed to study its poling behavior and the stability of the poling-induced orientation. The nonlinear optical (NLO) coefficientd 33 of poled polyimide film is 32.2 pm/V at 1064 nm fundamental wavelength. The SHG signal of the poled polymer film was quite stable below 200°C, and then began to decay rapidly above 220° C. The half-decay temperature of dipole orientation for the film is 250° C.

关 键 词：poled polymer FUNCTIONALIZED POLYIMIDE SIMULTANEOUS POLING and POLYMERIZATION second HARMONIC generation thermal stability of poling-induced orientation. 

分 类 号：O633[理学—高分子化学]