Study On Detection Of Polyelectrolyte Related To Interfacial Adsorption And Preparation Of Composite Materials

Polyelectrolyte is a kind of important application of functional polymer.It has an extensive and specific application in ion exchange,catalysis and penetration,drug release,environmental protection.Therefore,its application and the interaction mechanism of polyelectrolyte molecule has become the focus of research.It is very important to study the interfacial phenomena of polyelectrolyte and mechanism for promoting the application of polyelectrolytes.Traditional interface detection technologies have all sorts of shortcomings.However,the new sum frequency generation(SFG)technology has the advantages of high sensitivity,in situ and nondestructive in the detection,so it is very important for the detection of polyelectrolyte interface.P4VP is a kind of typical alkali polyelectrolyte,and PAA(polyacrylic acid)is a typical poly acid polyelectrolytes,so it is an interesting and meaningful topic to study orientation distribution of interfacial molecules and the interaction mechanism.The previous study on this just by IR and NMR methods,however,there are inevitable shortcomings that the body signal can not be excluded,and it can not in situ non-destructive detecting specific changes of functional groups in the reaction process,so the results obtained is not accurate enough.As one of the most effective methods of analysing and measuring the interface structure,the new sum frequency generation(SFG)technology has important application value in the field of polymer materials and biomedicine.We collect the SFG signal of P4VP surface in different chemical environment(water,PAA solution and HCl solution),under different polarization modes(SSP,PPP)and under different frequency range(1500-1800 cm-1,2900-3600cm-1).Through comparative analysis the results,we studied the changes in P4VP pyridine ring and the functional groups related to protonation and hydrogen bonding interaction,and we further research the mechanism of P4VP interact with PAA,which is of great significance to study the reaction kinetics and correlative application design.In addition to the interface detection of polyelectrolyte reaction,we also designed the composite material based on polyelectrolyte polydopamine and tested the adsorption performance.Dopamine is a safe and cheap material which have high adsorption capacity,also the polydopamine has high adsorption capacity and good structural stability.In order to improve the application of dopamine in the treatment of copper ions in Wastewater,we study the system of polydopamine and graphene polymer,using the template method combine with the chemical reduction method to prepare the three-dimensional porous materials fleetly and efficiently.Through comparing the different adsorption capacity of graphene,polydopamine vesicle,polydopamine graphene composite in the adsorption of copper ions,we found that the composite materials we synthesis has good adsorption ability than grapHene and polydopamine.This provides a rapid and efficient method for the preparation of grapHene polydopamine composite materials with high adsorption,which provides some references for the research on the application of graphene based composites in the field of wastewater treatment.