5 results about "Chemical Linkage" patented technology

This invention discloses an environmentally friendly biodegradable plastic packaging material and its preparation method, belonging to the technical field of polymer biodegradable packaging materials. It aims to solve the problems of poor compatibility, low melt strength, and slow degradation of existing polylactic acid (PLA) blends. This invention uses PLA as a matrix, introduces a furanyl dicarboxylic acid-pentanediol-itaconic acid copolyester containing side-chain double bonds as a functionalized flexible component, and adds thiol-modified epoxidized soybean oil as a reactive compatibilizer. Chemical linkages between different polymer chains are achieved through reactive extrusion, constructing a cross-linked network structure of thioether bonds. The resulting packaging material maintains good mechanical properties while exhibiting excellent gas barrier properties and biodegradability.

The application relates to the technical field of high polymer materials, and discloses an antibacterial and flame-retardant PE-PET composite fiber and a preparation method thereof. The antibacterial and flame-retardant PE-PET composite fiber is mainly prepared from polyethylene, modified polyethylene and polyethylene terephthalate as raw materials. The application prepares modified polyethylene, the polar structure contained in the modified polyethylene and other polar structures produce chemical linkage with each other, the degree of chemical crosslinking is increased, the mechanical properties of the composite fiber are increased, the flame-retardant structure and the antibacterial structure contained in the modified polyethylene increase the flame-retardant properties and the antibacterial properties of the composite fiber.

The present invention provides a method for manufacturing a dielectric material for capacitors, a method for manufacturing a capacitor, and a capacitor. [Solution] The method comprises generating a polymer chain from monomers by polymerization and functionalizing several repeating units in the polymer chain with reactive groups. The reactive groups branch off from each polymer chain. Furthermore, the reactive groups are suitable for reacting with linker molecules. The reactive groups are therefore suitable for forming covalent bonds with linker molecules. The method also comprises adding linker molecules to the polymer chain. Each linker molecule has at least two chemical linkage points, each of which is suitable for forming covalent bonds with reactive groups. The method further comprises achieving crosslinking of the polymer chain by the reaction of linker molecules having two reactive groups.

This invention belongs to the fields of medicinal chemistry, glycochemistry, and biomedicine, and provides a fucoidan-based heparin pentasaccharide, its preparation method, and its applications. The preparation method involves the chemical linkage and purification of sulfated azidoethyl-α-L-pyranoside with alkyne-based heparin pentasaccharide to obtain the target product. This compound exerts anticoagulant and antithrombotic effects by potently inhibiting the intrinsic coagulation factor X enzyme complex (FXase). Its APTT prolongation and FXase inhibitory activity are significantly superior to heparin pentasaccharide, and it significantly reduces the risk of bleeding at equivalent antithrombotic doses. It can be used in the development of drugs or functional foods for thrombotic cardiovascular and cerebrovascular diseases.

The invention relates to the field of sugar chemistry, in particular to thioester modified sugar amino acid and a method for synthesizing glycopeptide by using the thioester modified sugar amino acid. The thioester modified glycoamino acid is selectively activated by a silver reagent and can be coupled with amino at the tail end of solid-phase loaded polypeptide resin to synthesize first glycopeptide under the action of an additive and organic alkali, and quantitative (100%) reaction can be realized within 10 minutes by only needing 1 equivalent dosage of each reaction reagent under the microwave reaction condition. Fmoc protection in thioester-modified glycoamino acid in the first glycopeptide can be removed subsequently, amino acid or polypeptide fragments are used as raw materials, second glycopeptide is synthesized through a solid-phase polypeptide synthesis method, the second glycopeptide can be subjected to structural modification, and the second glycopeptide can be obtained. The structural modification method comprises the following steps: connecting polypeptide fragments through natural chemical connection and serine / threonine chemical connection reaction, or extending sugar chains through an enzymic method; and finally, performing deprotection and cracking to obtain a target product.