采用溶胶-凝胶技术,以4,4'-(六氟异丙基)-苯二酸酐(6FDA)、5,5'-(六氟异丙基)-二-(2-氨基苯酚)(6FHP)、非线性生色分子4-(N-2-羟乙基-N-甲基氨)-4'-[(6-硝基苯并噻唑-2-取代)二氮烯基偶氮苯(HNBDA)、偶联剂γ-氨丙基三乙氧基硅烷(APTES)和正硅酸乙酯(TEOS)水解液合成了系列的聚酰亚胺/SiO2杂化材料,其中TEOS的含量为0～22.5%.采用红外、热分析、扫描电镜、透射电镜和X射线衍射等进行表征.它们的玻璃化转变温度和热分解温度分别为216～366℃和321～438℃,表明具有较好的热稳定性.测定极化后材料832nm处的电光系数γ33为21～35 pm/V,且电光系数保持其初始值的85%以上(100 h),结果表明杂化材料在光器件上具有潜在的应用.
A series of the polyimide-silica NLO hybdd materials were synthesized from 4,4'-(Hexafluoroisopropylidene)-diphthalic Anhydride(6FDA),2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane(6FHP),nonlinear optical (NLO)molecule 4-(N-2-Hydroxyethyl-N-methylamino)-4'-[(6-nitroben-zothiazol-2 yl)diazenyl]azobenzene(HNBDA),coupling agent APTES and hydrolysate of TEOS via sol-gel process.The TEOS content in the hybrid films was varied from 0 to 22.5wt%.The prepared polyimide/silica hybrids were characterized by IR,thermogravimetric analysis(TGA),scanning electron microscopy(SEM),Transmission Electron Microscope(TEM),X-ray diffraction(XRD)etc.The glass transition temperature(Tg)and the decomposition temperature(Td)were in the range 216～366℃and 321～438℃respectively for materials.These results show that these hybrid materials had an excellent thermal stability.The electro-optic coefficients(γ33)at the wavelength of 832 nm for polymer thin films poled were in the range of 21～35 pm/V and the values remained well (retained＞85%for more than 100 h).The experimental results suggest that the hybrid thin films have potential applications as passive films for optical devices.
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