聚酰亚胺／SiO_2杂化材料的硅核磁共振波谱和电光性质的研究

以含氟的二胺5,5’-(六氟异丙基)-二-(2-氨基苯酚)(6FHP)及二酐4, 4’-(六氟异丙基)-苯二酸酐(6FDA)或均苯四甲酸酐(PMDA)为单体,以分散红 1(DR1)为活性生色分子合成具有非线性光学特性的含氟聚酰亚胺,并采用溶胶-凝胶(Sol-Gel)法合成相应的聚酰亚胺／SiO2杂化材料．采用固态29 Si MAS NMR谱研究了含氟聚酰亚胺／SiO2杂化材料的交联结构,结果表明杂化材料中是以T3、Q3、Q4结构为主,说明在杂化材料中形成了交联网状结构．采用衰减全反射(ATR)测定了聚酰亚胺和杂化材料在832 nm处的电光系数,其值分别为 32、28、34和29 pm／V,结果表明具有较高的电光系数．

Study of 29Si MAS NMR Spectroscopy and Electro-Optic Property Based on Polyimide/SiO2

The fluorine-containing polyimides with nonlinear optical were synthesized using the monomers 2,2-bis(3-amino-4-hydroxy phenyl) hexafluoropropane (6FHP), 4,4'-(hexafluoroiso-propylidene) diphthalic anhydride (6FDA) or pyromellitic dianhydride (PMDA) and Dispered Red 1 (DR1) as an active chromophore. The hybrid materials were obtained with Sol-Gel technique. 29Si nuclear magnetic resonance spectroscopy were used to characterize the structure of the polyimide/ SiO2 hybrid. The results revealed that Q3, Q4 and T3 were the major microstructure forming a network structure. The electro-optic coefficients of nonlinear optical polymers and hybrids were measured by attenuated-total-reflection (ATR) technique. They were 32,28,34 and 29 pm/V, separately. Their results showed that they had high EO coefficients.