Preparation Of Photoresponsive Hydrogels And Ion Imprinted Polymers Based On Modified Calixarenes

As an important part of supramolecular chemistry,calixarenes and their derivatives has attracted much attention for their unique properties and structures.In view of the excellent performance of calixarene and their derivatives.In this paper,four kinds of calixarenes were synthesized,and then,two kinds of azo-calixarenes are uesd of preparing of photoresponsive hydrogels and lithium ion imprinted polymers.The experimental work of this paper mainly includes three parts.In the first part,p-tert-butyl calix[4]arene A and calix[4]arene B were synthesized based on p-tert-butylphenol and formaldehyde.On the basis of the two calix[4]arene,4-Aminobenzaldehyde and 5-amino meta-dicarboxylic acid were introduced into the upper edge of calix[4]arene by diazotization reaction to obtain calix[4]arene C and calix[4]arene D.By analyzing their ¹H-NMR and IR spectra to determine their its structure.In the second part,the photoresponsive hydrogel was prepared by aldolamine schiff base reaction of chitosan and calix[4]arene C.The infrared analysis of the hydrogels showed that the chemical reaction between the amino group of chitosan and the aldehyde group on the crosslinking agent was successfully achieved,and a network structure was formed inside the hydrogels.By studying the effects of different light conditions and pH on the swelling ability of the hydrogels,to analysis the mechanism of the photoresponse of hydrogels.When the amount of cross-linking agent calix[4]arene C was 0.5%,the hydrogels has a maximum swelling degree of 110.5 g/g at 25?in a neutral solution environment,and the maximum adsorption amount to methylene blue was 0.035 g/g,and the adsorption rate reached 80%,finally.In the third part,a lithium ion imprinted polymer was prepared by using calix[4]arene D as functional monomer,lithium ion as template ion and ethyl acetate as pore-forming agent.Then,the adsorption properties of lithium ion imprinted polymers was studied.In this experiment,the standard curve of lithium ion solution was determined by hydrazine reagent photometric method,and the linear equation between lithium ion concentration and solution absorbance was obtained.The amount of cross-linking agent butyl titanate,ambient temperature,and effect of different conditions such as interfering ions on the adsorption performance of the imprinted polymer,the mass ratio of the imprinted polymer in the cross-linking agent butyl titanate and the functional monomer calix[4]arene D was 4:0.4,at35?,the maximum adsorption amount was 0.044 g/g.By studying the effect of UV light on the elution of imprinted polymer template ions,a more rapid way of eluting template ions was found.In addition,the nano-Fe₃O₄ was doped into the imprinted polymer,the results show that the adsorption capacity of the imprinted polymer has an enhanced effect.