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利用偶氮聚电解质上的羧基和偶氮生色基团的特性,研究了侧链偶氮聚电解质的pH值敏感性和热光性能.采用重氮-偶合反应方法合成了偶氮苯生色分子4-(4′-硝基苯基偶氮)苯酚,将生色分子、环氧氯丙烷和α-甲基丙烯酸通过自由基聚合法,合成了侧链偶氮聚电解质.利用傅里叶红外光谱(FTIR)、紫外-可见光谱(UV-V is)和核磁共振(1H-NMR)等分析手段对所合成的侧链偶氮聚电解质进行了结构表征.采用差示扫描量热分析仪(DSC)对偶氮聚电解质进行了热稳定性表征,其玻璃化转变温度(Tg)为189.8℃,表明具有较高的热稳定性.研究了不同pH值的偶氮聚电解质溶液的紫外-可见光谱,结果表明,偶氮聚电解质对pH值具有高度敏感性.采用衰减全反射(ATR)原理测量聚合物波导薄膜在650 nm和TM偏振下的折射率和热光系数dn/dT,其值为-1.92479×10-4℃-1,是无机材料如硅酸锌玻璃(5.5×10-6℃-1)和硼硅酸盐玻璃(4.1×10-6℃-1)的10倍以上,较有机材料聚苯乙烯(-1.23×10-4℃-1)和PMMA(-1.20×10-4℃-1)大.
The pH sensitivity and thermo-optical properties of the azo polyelectrolytes were studied by using the characteristics of carboxyl and azo chromophore groups on azo polyelectrolytes.The azobenzene color was synthesized by diazo-coupling reaction A 4 - (4’-nitrophenylazo) phenol was synthesized by side-chain azo polyelectrolytes using free-radical polymerization of chromogenic molecules, epichlorohydrin and α-methacrylic acid The structure of the synthesized azo polyelectrolytes was characterized by FTIR, UV-Vis and 1H-NMR. Differential scanning calorimetry (DSC) was used to characterize the thermal stability of azo polyelectrolytes with a glass transition temperature (Tg) of 189.8 ℃, indicating high thermal stability.The azo polyelectrolyte solutions with different pH values were studied by UV-Vis The results show that the azo polyelectrolyte is highly sensitive to pH.The refractive index and thermal coefficient dn / dT of the polymer waveguide films at 650 nm and TM polarization are measured by the attenuated total reflection (ATR) principle Is -1.92479 × 10 -4 ° C. -1, which is an inorganic material such as zinc silicate glass (5.5 × 10 -6 ° C. -1) and borosilicate 10 times more salt glass (4.1 × 10-6 ℃ -1), and the organic material than polystyrene (-1.23 × 10-4 ℃ -1) and PMMA (-1.20 × 10-4 ℃ -1) large.