Peparation And Application Of Thermally Responsive Ionogel

In the process of the development and progress of science,people have discovered and explored many natural phenomena and the operating laws behind them.The phenomenon of animals and plants responding to external stimuli such as light,temperature,electricity,magnetism,and humidity has always attracted people’s attention.As a common stimulus in the environment,researchers have been explored and designed temperature-responsive materials for a long time.Temperature-induced transparency reversible gel materials have attracted extensive attention due to their promising applications in smart windows,flexible electronic devices,etc.Existing temperature-induced transparency reversible materials such as VO₂change the light transmittance through the change of the internal crystal structure,but the transparency transition temperature is too high（68°C）,making it difficult to apply in real scenarios.Although the hydrogel represented by NIPAM already has good performance,the durability of the hydrogel has been difficult to improve.Transition metals and their derived materials also have good properties,but their high manufacturing and design costs limit their development in practical applications.The transparency of the above materials is mostly LCST type,which is not suitable for practical application scenarios and cannot meet the needs of privacy protection.In this context,it is very attractive to prepare a stable and easily tunable UCST type material with reversible change in transparency.These properties are very beneficial for the preparation of smart windows and flexible smart materials.Ionogels are composite materials composed of copolymers and ionic liquids（ILs）.ionogels possess many of the advantages of ionic liquids（strong environmental stability,high customization,etc.）.With the development of temperature-responsive materials,it has become more and more urgent to prepare a material with good environmental stability,easy preparation,and good transmittance transition.Although temperature-responsive ionogels have made some progress,ionogels that meet the above conditions are still less developed in the field of temperature-responsive materials.How to prepare temperature-responsive ionogels by a simple method and matching the transition temperature transition properties of ionogels with possible application scenarios remains a challenge.In summary,a simple method is used to prepare a UCST type temperature-responsive ionogels with good transmittance transition and high stability,which is suitable for the design and preparation of flexible temperature-responsive materials in smart windows,flexible electronic devices and other products.In this paper,by co-dissolving hydrophobic monomers,hydrophilic monomers,hydrophobic ionic liquids and water to form a homogeneous solution,a one-step polymerization method is used to simply prepare a reversible temperature-responsive ionogel with good flexibility and transparency..Through UV-Vis spectroscopy,rheological,IR,SEM,TG,measurement,the transmittance,behavior,internal chemical structure,surface mechanical morphology,thermal stability,and the mechanical properties of the gel were characterized.The influence of water content on the change of transmittance and the influence of the ratio of hydrophilic and hydrophobic monomers on the temperature-sensitive effect are discussed.Through the test of elastic modulus（G’）of the gel under different temperature conditions,the influence of the internal structure change of the gel on its physicochemical properties under the temperature changes was discussed.Furthermore,simulated smart windows were prepared to explore the possibility of temperature-responsive iongels in practical applications.