Preparation And Application Of Glycol Polymer Hydrogel

1.A copolymeric hydrogel?PEGMA?with poly?ethylene glycol?methyl ether acrylate?PEGA?,2-methoxyethyl acrylate?MEA?and acrylic acid?AA?were synthesized in this study.The obtained PEGMA hydrogel is of thermal and pH dual-responsive and show excellent adsorption properties for many metal ions.Fe???and Pb?II?were selected to study thermodynamics and kinetics.The maximum adsorption amount was calculated to be 196.44(Fe³⁺)and 173.30(Pb²⁺)mg/g.Besides,using the thermal and pH responsibility,the PEGMA hydrogels can quickly release the adsorbed molecules with control.Thus,the PEGMA hydrogels may be new high-performance and environmental friendly material for metal pollution treatment with promising developmental potential.2.We used low-field NMR experiments to analyze the swelling process of water entering PEGMA hydrogels.We proved that the stronger binding ability of Co²⁺Ni²⁺Fe³⁺to carboxyl groups affects the combination of water and carboxyl groups.During the swelling process,water molecules enter the hydrogel together with the metal ions.The water molecules are discharged from the gel and re-enter the gel network to the process of dynamic balancing.The feasibility of PEGMA hydrogel as a metal ion adsorbent was theoretically proved.3.We utilize a viable method of transitioning hydrogel from soft,highly stretchable to a low tensile,rigid and tough structure.The hydrogel achieved shape memory and recovery in 1 minute.The hydrogel was mechanically modified by reversibly manipulating the modulus of the hydrogel,and its modulus was increased from 50 kPa to 8 MPa.After 5 repeated adsorption/release processes,PEGMA still maintains good performance.The research and development of intelligent deformation systems in the field has certain reference significance.