Study On Polyphenol Polymer And Preparation Of Functional Materials

Polyphenols are a kind of natural,green,non-toxic and inexpensive polyhydroxy compound widely existing in plants in nature.It has showed wide applications in the fields of biomedicine,catalysis,agriculture,sensing and water treatment,etc.However,almost all of reported researches are limited in aqueous solution,few of people pay attention to polyphenol polymerization in non-aqueous solution,it may limit the wide application of polyphenol chemistry tremendously.In addition,the coating was formed by dipping in the water solution for a long time to generate insoluble substances,which result in waste of raw material and difficulty in rapid and large-scale production.In this paper,aiming at solving the problems above,polyphenols as electrophilic groups can react with nucleophilic groups,it is reported that polyphenols can react in some organic solvents under the action of different amines.According to the different structure and surface energy of amines,coating with different wetting properties can be constructed on the surface.Basing special wetting property of polyphenol-amines coating and spraying method,the superhydrophobic layer can be rapidly prepared by in-situ co-deposition.The properties and application of superhydrophobic coating were studied.By using phenol-metal complexation and spray method,the phenol-metal complexation coating can be formed by in-situ deposition on the surface.The feasibility and uniformity of the coating was explored,as well as the application of the coating in oil-water separation was tested.The contents of this research are as follows:?1?Different organic amines are be used as proton trapping agents,by capturing the H⁺to promote the production of free radical active species,to accelerate the polymerization rate of polyphenol.Increasing the concentration and decreasing the pK_b of the amine can make the reaction equilibrium shift towards the product in the organic solvent.O-quinone groups are unstable intermediates and highly reactive electrophilic molecules,which can have secondary reactions with nucleophilic groups.It is verified that polyphenols can undergo Michael addition reactions with primary and secondary amines to change the wettability of the substrate surface.?2?Combination pyrogallol and octadecylamine,combined with the spraying method and the oxidant CuSO₄/H₂O₂,to rapidly form large-scale superhydrophobic coating with micro-nano roughness structure and low surface energy chemical substance.And characterization by SEM,AFM,WCA,FTIR,XPS,etc.to clarify the decisive effect of the surface micro-nano structure and the chemical composition of the low surface energy.The surface stability of the material was studied and its application in oil-water separation was explored.?3?The use of polyphenols can form a stable phenol-metal complex coating with metals,and the advantages of rapid container-free coating can be achieved by the spray coating method.Polyphenols are used as organic ligands,and metal ions act as inorganic ligands in linking phenolic substances.The role of the joint agent.Phenols and metal ions can rapidly form in situ complexes and then adhere to the base.Large-area coating of the substrate is achieved by adjusting the pH of the solution and the metal ions to explore optimal conditions for spray film formation,coating thickness,and wettability of the coating surface.The complex coating based on the two coordination sites has excellent superhydrophilicity and can perform oil-water separation tests.These meridian-coated super-hydrophilic cotton fabrics have good cost performance and environmental protection,and have great application potential in large surface engineering and oil-water separation green processes.