Preparation and properties of microgel reinforced polyacrylamide hydrogel
Microgel reinforced polyacrylamide double network(MG-PAM DN)hydrogel was synthesized from initiation polymerization by combining AM solution with microgel(MG)suspension,which was prepared by in-situ radical polymerization and mechanical crushing using 2-acrylamide-2-methylpropanesulfonic acid(AMPS),acrylamide(AM)and N,N'-methylenebisacrylamide as monomers,and then characterized by FTIR and SEM for structure and morphology analyses.The effects of MG suspension dosage(based on the total mass of solution,the same below)on the properties of MG-PAM DN hydrogel were investigated through combination with analyses data of mechanical properties,swelling properties and energy dissipation properties.The results showed that,when the dosage of MG suspension was 40%,the prepared MG-PAM DN hydrogel exhibited a dense three-dimensional network structure with an average pore size of 20 µm,compressive strength of 25.42 MPa(95%deformation),tensile strength and elongation at break of 201.2 kPa and 450.4%,respectively,and good energy dissipation performance under different strains(70%,80%).Moreover,MG-PAM DN hydrogel could withstand bending,knotting,pressing,cutting,lifting and other mechanical exertion.The introduction of MG increased the cross-linking density inside MG-PAM DN hydrogel and formed a denser network structure,resulting in higher loss modulus and energy storage modulus.
万方数据
维普
