阴离子树枝状聚(胺-酯)的合成及其溶液性质

摘要

以树枝状聚(胺-酯)(PAE(NH2)8)和丙烯酸钠(SAA)为原料合成了阴离子树枝状聚(胺-酯)(PSAA).利用正交实验研究了反应温度、反应时间及原料配比对产物收率的影响.实验结果表明,适宜的反应条件为:反应温度50 ℃、反应时间96 h、n(PAE(NH2)8)∶n(SAA)=1∶40,在此条件下,产物收率可达96.68％.采用FTIR方法对PSAA的结构进行了表征,同时测定了其阴离子化程度.分析了溶液pH对PSAA溶液的黏度和电导率的影响.当PSAA含量在1.0％～5.0％(w)的范围内时,黏度受溶液pH影响较小.溶液pH对电导率的影响较大:当pH=1 ～7时,电导率随pH的增大而显著下降；当pH=9时,电导率呈最低值；当pH=10～12时,电导率随pH的增大而增大.%Anionic dendritic poly(amine-ester)(PSAA) was synthesized from dendritic poly(amineester) [PAE(NH2)8] and sodium acrylate(SAA).The effects of reaction temperature,reaction time and the mole ratio of reactants on the product yield were studied through orthogonal experiments.Under the optimum conditions:reaction temperature 50 ℃,reaction time 96 h and n(PAE(NH2)8):n(SAA)1:40,the yield of PSAA was 96.68％.The PSAA structure was identified by means of FTIR and its ionization degree was determined.The effects of solution pH on the viscosity and conductivity of PSAA aqueous solution were analyzed.When the content of PSAA in the solution is in the range of 1.0％-5.0％(w),the viscosity changes slightly with the solution pH.The conductivity of the PSAA solution is affected significantly by the solution pH.When the pH ranges 1-7,the conductivity of the PSAA aqueous solution dramatically decreases with increasing the pH.The conductivity has a minimum value at pH 9.When the solution pH is 10-12,the conductivity increases with increasing pH.