Photo- and pH-sensitive azo-containing cationic waterborne polyurethane

The study of cationic waterborne polyurethanes modified by two different forms of polydimethylsiloxane

“…[7][8][9][10] These excellent characteristics give CWPUs the great potential to become high value-added materials. 11,12 Nevertheless, the introduction of cationic groups into polyurethane segments could decrease the water resistance and surface hydrophobicity of WPU lms. Therefore, most research has been focused on improving the performance of waterborne polyurethanes.…”

Synthesis and characterization of novel natural rubber based cationic waterborne polyurethane—Effect of emulsifier and diol class chain extender

“…Meaning of cationic and anionic WPU is always composed of internal emulsifier while nonionic emulsifier is composed of external emulsifier. For example, anionic WPU (aWPU) is usually composed of 2,2‐dimethylolpropionic acid, cationic WPU (cWPU) is usually composed of N ‐methyl diethanolamine (NMDEA), and nonionic WPU is mostly used glycol class such as poly(ethylene glycol) …”

“…As basic knowledge, ordinary WPUs are based on polyol from fossil‐fuel feedstock petroleum, used commercial chemicals in class of polyether and polyester, that is very stress now against environmental friendly. To replace the usage of petroleum‐based polyol, cWPU is the intended material to find the new way or new resource for synthesizing base on natural and renewable resource materials.…”

Study on Recognition of Metallic Ions by a Photo-Sensitivity Liquid Crystal of Ethylcyclohexyl Acyloxy Azobenzoic Acid

“…The liquid crystalline material has special physical, chemical and optical properties. Azo group is functional group of special optical activity [8][9][10]. If the liquid crystal compounds are combined with the optically active group of azo form.…”