36results about How to "Molecular weight easy" patented technology

A water soluble polymer is provided having two or more oligomers linked to each other by hydrolytically degradable carbonate linkages. The polymer can be hydrolytically degraded into oligomers (e.g., oligomers of ethylene oxide) under physiological conditions. The polymer can be conjugated to biologically active agents such as proteins or peptides to impart improved water solubility, reduced immunogenicity, reduced rate of renal clearance, and increased stability. The polymer is useful in making hydrolytically degradable hydrogels which can be used in drug delivery and related biomedical applications. On example of the polymer is a poly (ether carbonate) of the formula X—O—[(—CH2CH2-0-)n—CO2—]n—(CH2CH2))n-y where X and Y are independently H, alkyl, alkenyl, aryl, or a reactive moiety, and at least one of X and Y is a reactive moiety.

The invention discloses a preparation method for a water-repellent oil-repellent superhydrophobic fabric surface. The preparation method comprises the following steps: (1) weighing a cotton fabric, and preparing a cotton-cellulose macromolecular initiating agent under the action of the initiating agent and a catalyst; (2) grafting monomeric GMA on the prepared cotton-cellulose macromolecular initiating agent, vacuumizing a reaction system and introducing nitrogen, so as to obtain cotton cellulose grafted by the GMA, soaking the cotton cellulose grafted by the GMA in an acid solution, and hydrolyzing epoxy groups to form a cellulose surface rich in hydroxyl groups; and (3) performing acylation reaction between the cotton cellulose grafted by the GMA on the cellulose surface rich in hydroxyl groups and a monomer with low surface energy to obtain the water-repellent oil-repellent superhydrophobic surface. The preparation method is mild in reaction condition, simple, and easy to operate, can be realized at room temperature, and can guarantee the good superhydrophobicity and oil resistance without influencing of the comfort and the mechanical property of the cotton fabric.

The invention discloses a biphenyl-skeleton chiral aminophenoloxy dinuclear zinc and magnesium compound, a preparation method thereof and an application in catalyzing lactone ring-opening polymerization. The preparation method comprises the following steps: directly reacting the neutral ligand with the metal raw material compound in an organic medium, and then obtaining the target compound through the steps of filtering and drying. The biphenyl skeleton chiral aminophenoloxy dinuclear zinc and magnesium compound of the present invention is a high-efficiency lactone ring-opening polymerization catalyst, which can be used to catalyze the polymerization of lactones such as lactide; especially for racemic lactone Esters can get polylactic acid with higher isotacticity. The advantages of the biphenyl skeleton chiral aminophenoloxy binuclear zinc and magnesium compounds of the present invention are very obvious: the raw materials are easy to obtain, the synthetic route is simple, the product yield is high, and it has high catalytic activity and stereoselectivity, and can obtain high Regularity, high molecular weight polyester material to meet the needs of the industrial sector. Its structural formula is shown below.

The present invention relates to silicone polymer ligands for binding to quantum dots. The silicone polymer ligands contain a multiplicity of amine, carboxy, and / or phosphine binding groups suitable for attachment to quantum dots. The present invention also describes a process for the preparation of quantum dot binding ligands.