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 relates to a preparation method of high-molecular-weight poly(methyl ethyl-methyl vinyl) siloxane. The method comprises steps as follows: (1) tetramethyl tetraethyl cyclotetrasiloxane, tetramethyl tetravinyl cyclotetrasiloxane and an end capping agent are mixed, a catalyst is added, and the mixture is subjected to a polymerization reaction for 1-4 h at the temperature of 80-180 DEG C; (2) after the polymerization reaction ends, the mixture is heated to 180-220 DEG C, micromolecular low-boiling-point substances in a material are removed in a vacuum state, the material is discharged after being cooled to the room temperature, and high-molecular-weight poly(methyl ethyl-methyl vinyl) siloxane is obtained. The high-molecular-weight poly(methyl ethyl-methyl vinyl) siloxane product is stable, the glass-transition temperature (Tg) is low, crystals are not formed at the low temperature, the polymerization process is simple, no solvent is required, the high-molecular-weight poly(methyl ethyl-methyl vinyl) siloxane can be obtained in shorter reaction time by strictly controlling the reaction condition, the yield is high, the molecular weight is controllable, the aftertreatment is simple, and large-scale production is facilitated.

The invention discloses oxazoline ring-containing amino tocopheroxyl zinc / magnesium complexes and a preparation method and an application thereof in high-activity and high-selectivity catalysis of lactone ring-opening polymerization. The preparation method includes the following steps: directly carrying out a reaction of a neutral ligand with a metal raw material compound in an organic medium, carrying out filtration, concentration and recrystallization steps to obtain the target compounds. The oxazoline ring-containing amino tocopheroxyl zinc / magnesium complexes are efficient lactone ring-opening polymerization catalysts, and can be used for catalyzing a polymerization reaction of lactones such as lactide; especially for rac-lactide, higher-isotacticity polylactic acid can be obtained. The oxazoline ring-containing amino tocopheroxyl zinc / magnesium complexes have quite obvious advantages that raw materials are easily available, the synthetic route is simple, the product yield is high, and the complexes have quite high catalytic activity and stereoselectivity, can obtain higher-isotacticity high-molecular-weight polyester materials, and can meet the needs of industrial departments. The complexes have the structural formula described in the description.

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.