The Self-assembly Behavior Of The Environmental Responsive Surfactant

Because surfactant has both hydrophilic groups and hydrophobic groups on one molecule at the same time, when reaching certain concentration, it can self-assemble and form various aggregations such as micelle, vesicle, liquid crystal etc. In addition, due to its diversified characteristics such as washing, emulsification, foaming properties, the surfactant is widely used in all walks of life, known as "industrial monosodium glutamate". Surfactant having responsiveness can exert special effect to external environment with its unique groups. In the following external environmental stimuli conditions, including temperature, pH, CO2, light and other factors, especially light (ultraviolet, visible light) as a kind of no pollution, clean and controllable factors stimulation, having lots of advantages for instance, no extra external additive, being relatively simple to operate, having the ability of the experimental process control and the wide range of applications. Thus, this kind of surfactant attaches significant importance to the development and the research of new polymer self-assembly in the body. So in recent years, ultraviolet visible light response of surface active agent became a hot spot in researches.However, single surfactant has certain toxicity more or less. Besides, its physical and chemical properties are relatively simple, and its functionality and application aspect are also comparatively single. The stability of two different surfactant mixed system, surfactant and polymer mixed system, as well as chemical activity is often better than that of single component. It can obtain different types and different morphology of the aggregates and lower surface tension, and it has extensive potential applications in fields like drug release, tertiary oil recovery and daily chemicals. Just because surfactants are widely used and people are enhancing their consciousness of protecting the environment, so the development of green, environmentally friendly and pollution-free surfactant is gaining its importance. Therefore, the research of functional surfactant self-assembling behavior of the combined systems has a broad and far-reaching significance.There are two aspects included in this thesis:(1) quaternary ammonium salt cationic surfactant with azobenzene (AzoC18NO+) and X-gemini surfactant (X) are synthesized; Then AzoC18NO+ and X are blended to study the self-assembly behavior of the mixed system AzoC]gNO+/X under the different concentration of AzoC18NO+; Finally, in the case of a fixed-proportion mixed system, the influence of photo induced isomerization on the self-assembly behavior of the mixed system AzoC18NO+/X is studied. Structure confirmation is done to the target product with the aid of NMR and Mass spectra; and the self-assembly behavior of the mixed system AzoC18NO+/X is studied with the utilization of DLS, SEM, TEM and ultraviolet absorption spectrum.(2) the temperature sensitive polymer PNIPAM-b-PAA and quaternary ammonium salt cationic Gemini surfactant with azobenzene AzoC10N2O22+ are synthesized. Then the system's self-assembly behavior are studied when the polymer PNIPAM-b-PAA solution is under different temperatures; in order to further study the addition of quaternary ammonium salt cationic Gemini surfactant with azobenzene and the influence of azobenzene photosensitivity on polymeric micelles, the influence of different addition amount of AzoC10N2O22+ on the self-assembly behavior of the mixed system PNIPAM-b-PAA/AzoC10N2022+ is studied; meanwhile, the influence of the cis-trans isomer ism's flipping of azobenzene in the mixed system PNIPAM-b-PAA/AzoC10N2022+ on its self-assembly behavior is studied. Structure of the target product and its molecular weight distribution are ascertained with the help of NMR and GPC; and are used to study The self-assembly behavior of the mix system PNIPAM-b-PAA/AzoC10N2O22+ are studied with methods of DLS, SEM, TEM and ultraviolet absorption spectrum.