【摘要】 以对硝基苯胺、亚硝酸钠和苯胺为原料,采用重氮-偶合反应方法,合成含偶氮基团的生色分子4-(4’-硝基-苯基二氮烯基)-苯胺(NPDA)。将NPDA与手性试剂L(-)-酒石酸、异佛尔酮二异氰酸酯(IPDI)制备新型旋光偶氮聚氨酯(OAAPU)。利用傅里叶红外光谱(FT-IR)、紫外-可见光谱(UV-Vis)和核磁共振等分析手段对所合成的NPDA和OAAPU进行了结构表征。采用差示扫描量热分析仪(DSC)对OAAPU进行了热稳定性表征,其玻璃化转变温度(Tg)为165.1℃,表明具有较高的热稳定性。采用ATR技术,测定了材料在不同波长和不同温度处的折射率(n),得到了相应的热光系数(dn/dT)。由Sellmeyer色散方程得到了聚合物体系折射率的色散曲线和Sellmeyer系数。结果表明,该材料对研制新型数字热光和全光开关具有一定的意义。更多还原

【Abstract】 A chromophore containing azo group,4-(4’-nitrophenyldiazenyl)-aniline (NPDA),was synthesized with 4-nitroaniline,sodium nitrite and aniline via diazo-coupling reaction.Novel optically active azo polyurethane (OAAPU) was obtained from NPDA,chiral reagent L(-)-tartaric acid and toluene diisocyanate (IPDI).The chemical structures of NPDA and OAAPU were characterized by FT-IR,UV-Vis spectroscopy and 1H NMR.The thermal property was characterized using the differential scanning calorimeter (DSC).The glass transition temperature (Tg) was 165.1℃ and the result showed that the OAAPU had excellent thermal stability.The measurements of refractive index (n) and thermo-optic coefficient (dn/dT) were demonstrated at different wavelengths and temperatures by ATR technique.The refractive index dispersions curve and Sellmeyer coefficients of OAAPU were obtained by Sellmeyer equation.The conclusion has a little significance to develop new the digital optical and thermo-optic switch.更多还原