4results about How to "Achieve cross-linking" patented technology

The invention provides a method for grafting polymyxin on the surface of polystyrene, which comprises the following steps: by taking chloromethylated polystyrene as a carrier base material, carrying out nucleophilic substitution reaction on the chloromethylated polystyrene and diallylamine, and carrying out zwitterionic reaction on the chloromethylated polystyrene and a zwitterionic reagent in sequence; the polymyxin is grafted on the surface of the polystyrene through graft copolymerization between the polystyrene, a glycidyl-containing zwitterionic monomer and a glycidyl-containing gemini zwitterionic cross-linking agent and amino ring-opening reaction of the polymyxin. According to the technical scheme of the invention, the prepared surface polymyxin polystyrene not only has specific adsorbability to blood endotoxin, but also has excellent hydrophilicity, blood compatibility, anti-blood coagulation function and anti-protein non-specific adhesion characteristic.

The application discloses a kind of for phenylalanine chiral separation biomimetic temperature-sensitive composite membrane and preparation method and application, the present application is with polymer film as substrate, by the method for preparing biomimetic temperature-sensitive hydrogel of chemical crosslinking.Biomimetic temperature-sensitive composite membrane includes the following steps: polymer film is placed in containing o-diphenol group, glycosyl material and temperature-sensitive substance alkaline solution, after a period of time, it is taken out, after deionized water is washed, place in cross-flow membrane filter, chiral separation of phenylalanine can be realized.The modified membrane piece under the operating pressure of 50 kpa and the separation temperature of 40 DEG C, the separation factor of D / L-phenylalanine can reach above 3, maintain higher permeation flux, and anti-pollution performance is significantly enhanced.The preparation method of the biomimetic temperature-sensitive composite membrane disclosed in the application is simple and mild, raw material is cheap and easy to obtain, the prepared biomimetic temperature-sensitive composite membrane has good temperature sensitivity, anti-pollution and excellent chiral separation effect, with the characteristics of resource-saving and environment-friendly.

This invention discloses an aminated graphene oxide-based bipolar membrane and its preparation method, belonging to the field of bipolar membrane technology. The bipolar membrane is composed of a sulfonated polyphenylene sulfone cation layer, an aminated graphene oxide interlayer, and a quaternized polyphenylene ether anion layer stacked sequentially. This invention utilizes the aminated graphene oxide as the interlayer, taking advantage of its two-dimensional sheet-like morphology, abundant catalytic groups, and cross-linking effect to achieve a bipolar membrane with low water dissociation voltage, good interlayer compatibility, and structural stability. When applied to electrodialysis, it improves alkali concentration and current efficiency compared to commercially available membranes, while reducing energy consumption, showing promising application prospects in acid and alkali preparation, resource recovery, and other fields.

The invention discloses a polylactic acid aluminum laminated film and a preparation method thereof, and belongs to the field of films. The polylactic acid aluminum laminated film comprises a polylactic acid film material, a polyurethane coating and an aluminum laminated layer which are arranged in sequence, the polyurethane coating is formed by curing a polyurethane coating, and the polyurethane coating is subjected to plasma surface treatment. The polyurethane coating is prepared from the following raw materials in parts by weight: 70-80 parts of hydroxyl acrylate emulsion, 1-1.5 parts of isocyanate modified cellulose, 7-9 parts of an isocyanate curing agent, 2-4 parts of an auxiliary agent and 20-30 parts of water. The preparation method has the effects of improving the adhesive force between the polylactic acid film and the aluminum layer and improving the durability of the polylactic acid aluminized film.