Design,Preparation And Properties Of Supramolecular Gels Containing Pyridine Group

Pyridine group is a common group widely existing in natural compounds.When this group is introduced into low molecular gelling agent,pyridine group itself has π-πaccumulation tendency and various modifiers,which promotes the self-assembly of gel factors,thus laying a foundation for the development of different types of supramolecular gels.Based on the properties of pyridine group,two derivatives containing pyridine group were designed and synthesized,and self-assembled with other substances to form supramolecular hydrogels.1)A derivative containing ditripyridine group was designed and prepared.The derivatives were difficult to form gels by conventional methods.Surfactants were added to induce bitripyridine derivatives to form gels.By testing the ability of different surfactants to induce gelling,it was found that gelling was easier between the derivative and ionic surfactant.The supramolecular hydrogels were characterized by fluorescence,ultraviolet,nuclear magnetic,infrared,rheology and scanning electron microscopy,and the interaction mode between surfactants and ditripyridine derivatives was determined,and the corresponding mechanism was proposed based on the experimental data.This study provides a new solution for the formation of supramolecular hydrogels from tripyridine group derivatives.2)Based on the properties of pyridine group,a pyridonium salt containing boric acid group was designed and synthesized.By doping it with polyvinyl alcohol and carrageenan to form supramolecular hydrogel,and freeze-thaw cycle four times,to further enhance the performance of the gel,the gel was treated with ethylene glycol to complete the preparation of the gel.The optimal proportion of different components of the gel was determined by the stretching and compression properties of the gel.It was found that the addition of pyridonium salts containing boric acid groups was beneficial to improve the mechanical properties of the gel.The gel was characterized by SEM.It was found that the gel had porous structure with the addition of carrageenan and pyridonium salt.The gel is used as a diaphragm in the hydrogel supercapacitor,which is combined with the prepared carbon cloth coated with conductive paste to form the hydrogel supercapacitor.The mass specific capacitance of the gel capacitor is determined by cyclic voltammetry,and the influence of bending and low temperature on the specific capacitance of the gel capacitor is studied.It is confirmed that the gel has good mechanical properties,conductive properties and antifreeze properties,and has certain application prospects in the field of diaphragm of hydrogel supercapacitors.