Research On Construction And Performance Of Stimulus Responsive Polymer Hydrogel

Stimulus-responsive hydrogel materials are new materials with broad prospects.Compared with other new materials,hydrogel materials have the advantages of high stability,high toughness,rapid response and accuracy,and fast recovery speed.As one of the smart response materials,stimulus-responsive hydrogels can reversibly change the internal structure of the gel,its color,or the shape of the gel when it is subjected to a series of different external stimuli such as mechanics,temperature and p H.It can be used in various fields such as smart sensors,drives,and anti-counterfeiting materials.In this paper,sodium dodecyl sulfate(SDS)and sodium chloride(NaCl)are dissolved in deionized water and then polyacrylamide(PAAm),stearyl methacrylate(SMA)and photoinitiator 2959 are added,The "one-pot method" was used to prepare micellar hydrogels with optical responsiveness.Studies have found that spherical micelle aggregates are formed inside the hydrogel.Under the action of external tension,the spherical aggregates will deform and oriented along the stretching direction,and the gel will change from macro-isotropy to macro-anisotropy.Finally produced strong birefringence in the hydrogel film,and caused the phenomenon of polarization interference.Experiments have proved that the optical responsiveness of the hydrogel film can be adjusted by controlling the composition of the gel.In addition,by shielding the radiation,a patterned hydrogel film can be prepared and applied to the field of anticounterfeiting.Cellulose nanocrystals(CNCs)are rod-shaped cellulose nanoparticles that evaporate the aqueous dispersion of CNCs to induce self-assembly of CNCs to form an ordered film.As a solvent for cellulose,an aqueous solution of N-methylmorpholine-N-Oxide(NMMO)will swell the film.After NMMO is removed,an ordered porous template with a certain rigidity is formed.In this thesis,disodium citrate and chloroauric acid are used to carry out wet chemical reduction reaction in the pores,and gold nanoparticles are filled in the pores of the porous template to prepare a structured gold-nanocellulose composite film.