Abstract: A polymer ultrafiltration membrane with a bicontinuous highly interconnected porous structure, a preparation method and applications thereof are provided. The ultrafiltration membrane has a bottom layer and a polymer layer. The polymer layer is divided into a sublayer and a surface layer. The surface layer is of a uniform small pore structure with a narrow pore size distribution. The sublayer is of a bicontinuous highly interconnected three-dimensional network porous structure. The bicontinuous highly interconnected porous structure of the bicontinuous highly interconnected porous ultrafiltration membrane is characterized as follows: in the thickness direction of the sublayer, the cross-sectional porosity on any XY cross-section perpendicular to the thickness direction is 40-90%, preferably 60-90%, and further preferably 70-90%; and the difference in the cross-sectional porosities between any two XY cross-sections does not exceed 10%, preferably not exceed 8%, and also preferably not exceed 5%.

Abstract: A method for preparing a chitosan/heparinized graphene oxide composite multilayer film on the surface of a medical magnesium alloy comprises the following steps: firstly preparing negatively charged heparinized graphene oxide; then performing surface chemical treatment and self-assembly of 16-phosphonohexadecanoic acid molecules on the medical magnesium alloy; further covalently immobilizing chitosan on the surface of the magnesium alloy, thereby constructing a positively charged material surface; finally, alternately immersing the surface-modified magnesium alloy material in heparinized graphene oxide and a chitosan solution, and then fully adsorbing, and obtaining the chitosan/heparinized graphene oxide composite multilayer film after drying.

Abstract: A method for preparing a chitosan/heparinized graphene oxide composite multilayer film on the surface of a medical magnesium alloy comprises the following steps: firstly preparing negatively charged heparinized graphene oxide; then performing surface chemical treatment and self-assembly of 16-phosphonohexadecanoic acid molecules on the medical magnesium alloy; further covalently immobilizing chitosan on the surface of the magnesium alloy, thereby constructing a positively charged material surface; finally, alternately immersing the surface-modified magnesium alloy material in heparinized graphene oxide and a chitosan solution, and then fully adsorbing, and obtaining the chitosan/heparinized graphene oxide composite multilayer film after drying.