Photo- and pH-sensitive azo-containing cationic waterborne polyurethane
Photo- and pH-sensitive azo-containing cationic waterborne polyurethane
复制标题
DOI：
10.1007/s00289-015-1312-9
复制
发表时间：
2015-04-01
期刊：
影响因子：
3.2
通讯作者：
Wang, Kunpeng
中科院分区：
文献类型：
--
作者：
Li, Junpei;Zhang, Xingyuan;Wang, Kunpeng
以聚醚多元醇、异佛尔酮二异氰酸酯、N-甲基二乙醇胺和新型芳香偶氮单体2，2 '-（4-（（4-乙基苯基）二氮烯基）苯基氮烷二基）二乙醇（EDPD）为原料，采用逐步加成聚合法合成了一种新型的含侧链芳香偶氮基团的阳离子水性聚氨酯（Azo-CWPU）。偶氮CWPU与偶氮单体相比表现出明显的蓝移色，且在不同的光照时间下，其紫外-可见吸收光谱发生了快速的变化。随着pH值的变化，偶氮CWPU分散液呈现出亮黄色、橙子和红色。关于橙子分散体，我们假设存在偶氮形式和腙形式的混合物。与不含偶氮基团的阳离子水性聚氨酯分散体（CWPU）相比，偶氮CWPU分散体具有更小的流体力学半径和更窄的分布，表现出更好的聚氨酯热力学性能。
In this study, a novel photo- and pH-sensitive cationic waterborne polyurethane containing side chain aromatic azo groups (Azo-CWPU) was synthesized by step-growth addition polymerization from polyether polylol, isophorone diisocyanate, N-methyl diethanolamine and a new aromatic azo-containing monomer, 2,2'-(4-((4-ethylphenyl)diazenyl)phenylazanediyl)diethanol (EDPD). Azo-CWPU showed a significant hypsochromic contrast to the azo monomer and rapid changes in UV-Vis absorption spectra at different irradiation times. Azo-CWPU dispersion displays bright yellow, orange and red color with the change of pH values. Regarding the orange dispersion, we assume that there is a mixture of the azoic form and the hydrazone form. Compared to cationic waterborne polyurethane dispersion without aromatic azo groups (CWPU), Azo-CWPU dispersion with smaller hydrodynamics radius and more narrow distribution shows good thermodynamic properties of polyurethane.