重氮树脂接枝罗丹明B聚合物对酸、碱的响应性

Responsivity of Grafting-Copolymer from Rhodamine B and Diazoresin to Acid and Base

利用重氮树脂(DR)中N2+的光解特性,通过罗丹明(B(RhB))对重氮树脂的接枝反应,得到了染料功能化的接枝聚合物DR-g-RhB,并由傅里叶红外光谱、1H-NMR、紫外-可见吸收光谱和荧光光谱等分析方法确认了产物结构。结果表明DR-g-RhB具有良好的热稳定性,失重5%所对应的温度超过360°C。通过溶液涂敷法形成的薄膜在不同酸碱度溶液中的UV-Vis吸收光谱会随浸入时间产生规律性变化:在pH=7.0的水中,吸光值基本不随时间变化;而在pH=12.0的肼水溶液中,吸光值随时间先下降、再增加;但在酸中则持续增加,而且对盐酸(pH=2.0)的响应比对醋酸(pH=2.3)更灵敏。

Functionalized diazoresin（DR） through the photochemical grafting reaction between rhodamine B（RhB） and diazonium group（N~~＋__2）,a novel grafting polymeric dye DR-g-RhB was obtained.The structure of the grafted polymer DR-g-RhB was characterized by FT-IR,（）^（1）H-NMR,UV-Vis and PL spectra.The grafting polymer DR-g-RhB exhibited excellent thermal stability,and its 5% weight loss temperature（T_（5%）） was over 360 °C.The response of DR-g-RhB film,which were coated by DR-g-RhB solution,to pH was monitored by UV-Vis spectra.In water（pH=7.0）,the UV-Vis absorbance of the film hardly varied with the increase of immersed time.If immerged in hydrazine hydrate aqueous solution（pH=12.0）,the absorbance decreased and reached its minimum value,further increased with the immerging time.（However,） the absorbance of the film continuously rised with the immerging time in acid aqueous solutions, and the（response） of the film in HCl solution（pH=2.0） was more sensitive than that in acetic acid solution（pH=（2.3）.）