49results about How to "Achieve cross-linking" patented technology

The invention belongs to the technical field of lithium ion batteries, in particular relates to a composite anode material for the lithium ion battery. The composite anode material comprises an anode active substance and a coating layer coated on the surface of the anode active substance, wherein the anode active substance can be Si, SiOx or silicon alloy, the coating layer is polymer which is of a reticular structure, and the mass percent of the coating layer accounts for 1-20% of the anode material. Compared with the prior art, the composite anode material has the advantages that the polymer which is of the reticular structure and used as the coating layer is coated on the surface of the active substance in a cross-linking manner, the coating layer has the electron conduction property and the ion conduction property, so that the situation that the lithium ions can be inserted into and separated from the anode active substance particles smoothly is ensured; furthermore, the coating layer is of the reticular structure and has good mechanical strength, and therefore, the integrality of the anode active substance particles can be kept in the electrochemical cycle process, the deformation of an anode strip is relieved, the electrochemical cycle performance of the lithium ion battery is improved and the service life of the lithium ion battery is prolonged.

The invention provides a cross-linked biologically degradable carrier polymer, a micelle and a vesicle, and a preparation method and an application of the cross-linked biologically degradable carrier polymer, micelle and vesicle, belonging to the field of biological medical material and solving a poor stability problem of the existing polymer micelle and vesicle. The carrier polymer is an A-B-C tri-block polymer, wherein the block A is polyethylene glycol, the block B is the polyethylene glycol containing functional groups in a lateral chain, and the block C is biologically degradable polyester. The invention also provides the polymer micelle and vesicle, which is formed by self assembly of the carrier polymer, wherein the size of the polymer micelle is 20-1000nm, and the size distribution is 0.01-0.50; the size of the vesicle is 20-1000nm, and the size distribution is 0.01-0.50. The polymer micelle provided by the invention can package fat-soluble matters; and the polymer vesicle can package water-soluble matters and the fat-soluble matters at the same time; and the polymer micelle or the vesicle has better mechanical strength and stability because the polymer micelle or the vesicle contains a transitional layer formed by the cross-linked block B.

The invention discloses a double-doped graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel prepared by a one-pot method. The method firstly polymerizes aniline, phytic acid and ammonium persulfate to obtain polyaniline, and dissolves it for later use; then dissolves chitosan powder in a mixed aqueous solution of lithium hydroxide monohydrate, urea and graphene oxide to obtain graphene oxide / Alkali-soluble chitosan solution; adding polyaniline / N-methylpyrrolidone solution, acrylamide, N,N'-methylenebisacrylamide, and ammonium persulfate in turn, and polymerizing to obtain a composite hydrogel; transferring to phytic acid solution secondary doping is performed in the middle to obtain a high-strength graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel material. The secondary doping process can improve the electrical conductivity of the hydrogel and adjust the mechanical properties of the gel. Due to its excellent mechanical properties and electrical conductivity, this material is expected to be used in electronic skin, flexible electronic devices and other fields.

The invention provides a preparation method of a gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane. The preparation method includes obtaining a hydrolyzed polyacrylonitrile ultrafiltration membrane with a polyacrylonitrile ultrafiltration membrane, and placing the ultrafiltration membrane in an ultrafiltration cup. The membrane is soaked with a mixed solution of glutaraldehyde and sodium lauryl sulfate, and an amphoteric polyethyleneimine solution in turn, and then the membrane is stirred and coated with the prepared tannic acid solution, and then the membrane is compressed by pressure filtration to obtain a gradient Cross-linked zwitterion-modified multilayer composite nanofiltration membranes. The present invention also provides the application of using the obtained composite nanofiltration membrane as a salt and dye separation membrane. The preparation method of the invention is simple and convenient, the membrane surface has a hydrophilic, loose and cross-linked separation layer, and the prepared membrane material is used for the separation of salt and dye, and has better water flux, dye retention rate and salt transmittance.