Preparation Of Supramolecular Gel/Gel Emulsion Based On Reversible Covalent Bonds And Its Template Application

Supramolecular gels have been widely used in the fields of drug sustained-release,biological tissue engineering and smart materials due to their unique stimulation response.However,the gel with poor mechanical properties and is easy to be destroyed structure to affect its application.Therefore,the mechanical strength of the gel was improved by doping nanoparticles and cross-linking various three-dimensional network structures.Among them,the introduction of dynamic covalent bond into supramolecular gel is one of the effective methods to improve gel strength.Dynamic covalent bonds have both properties of the stability of covalent bonds and reversibility of non-covalent bonds,thus becoming a new method to construct supramolecules.Porous materials have attracted much attention because of their low density,high specific surface area and excellent adsorbability.The preparation methods of porous materials have been included hard template and soft template.With the advantages of simple process and precise control of pore size,the soft template method is favored by researchers.In this paper,a series of small molecule gelling agents were prepared based on dynamic covalent bond and applied to gel and gel emulsion systems.The polyaniline microspheres and polypyrrole porous blocks were successfully prepared by using the gel emulsion as a template.This paper mainly includes the following three parts:In the first part,Carbon quantum dots(CQD and 16NH2-CQD)were prepared by using vitamin B2 as carbon source via W/O emulsion method.Their structures were characterized by FTIR and XPS respectively,and their microstructures were observed by TEM.The results indicated that hexadecylamine was successfully modified on the surface of carbon quantum dots by W/O emulsion method.Furthermore,introducing carbon quantum dots were significant effects on the stability,microstructure,mechanical strength and fluorescence properties of the supramolecular gels based dynamic covalent bond.These gels exhibited thermosensitivity and pH-stimulus responsibility.Rheological tests and fluorescence performance studies showed that by introducing 16NH2-CQD into the gel system showed more excellent stability,better mechanical strength and stronger fluorescence intensity.In the second part,O/W gel emulsion with n-hexane-water system was successfully prepared by using bismaleimide modified polyethylene glycol derivative(PEG-LMI)as dienophile and BOC-phenylalanine furan derivative(BOC-FB-NH2)as dienophile.The stabilizer is obtained through supramolecular assembled by Diels-Alder reaction.Furthermore,the polyaniline microspheres were successfully prepared by chemical oxidation method by introducing aniline monomer into the oil phase.The structure of compounds was characterized by 1H NMR and FT-IR spectroscopy.The phase behavior and microstructure of gel emulsion were controlled by changing water content.The micromorphology and thermal stability of the polyaniline microspheres were characterized by SEM and TGA.The polyaniline microspheres were successfully used for the adsorption of Cd2+in water.The results showed that the adsorption capacity of Cd2+reached 32.26 mg/g when the pH was 6.In the third part,the W/O polypyrrole gel emulsion was prepared by using furan modified phenylalanine cholesterol derivative with imine structure(FU-BADB)as stabilizer,pyrrobenzene as oil phase and FeCl3 aqueous solution as water phase.The preparation of porous polypyrrole monoliths based on gel emulsion as template.The structure of the stabilizer was characterized by 'H NMR and FT-IR.The phase behavior and micromorphology of polypyrrole gel emulsion were regulated by the change of water content.The elemental composition and microstructure of polypyrrole porous blocks were characterized by XPS,FT-IR and SEM.The porous polypyrrole material was used for the adsorption of organic solvents.It has different adsorption capacity for the two groups of homologues(o-xylene?m-xylene?p-xylene and n-propanol?n-decanol)respectively,which can be used to separate the two groups of homologues.