Surfactants are widely used of pharmaceutical, biotechnology, food and other industries because of its unique performances. The appearance of switchable surfactant will cause a huge leap of the surfactant industry. Switchable surfactants can control artificially whether it has the surface activity or not, so they can settle the problems of separation, recovery and reuse of surfactants after the reaction. Switchable surfactants can lower the environmental pollution caused by unwanted surface active agent, an...