57 results about "Pamam dendrimers" patented technology

The present invention discloses new types of poly(amidoamine) (PAMAM) dendrimer-cross-linked polyimide membranes and methods for making and using these membranes. The membranes are prepared by cross-linking of asymmetric aromatic polyimide membranes using a PAMAM dendrimer as the cross-linking agent. The PAMAM-cross-linked polyimide membranes showed significantly improved selectivities for CO2 / CH4 compared to a comparable uncrosslinked polyimide membrane. For example, PAMAM 0.0 dendrimer-cross-linked asymmetric flat sheet poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (DSDA-TMMDA) polyimide membrane showed CO2 permeance of 135.2 A.U. and CO2 / CH4 selectivity of 20.3. However, the un-cross-linked DSDA-TMMDA asymmetric flat sheet membrane showed much lower CO2 / CH4 selectivity (16.5) and higher CO2 permeance (230.8 GPU).

A process for forming a conjugate of a polyoxyalkylene polymer, such as polyethylene glycol, with a compound containing an amine group(s) and / or a sulfide group(s) by reacting the compound with an acrylate terminated polyoxyalkylene, such as polyethylene glycol terminated at one end with acrylate or methacrylate and terminated at the other end With a methoxy group. The reaction is believed to be a Michael addition. When the compound contains primary amine groups, such as the surface primary amine groups of a PAMAM dendrimer, it is usually desirable to convert the primary amine groups to secondary amine groups before the reaction with the acrylate terminated polyoxyalkylene.

The present disclosure relates to a dendrimer-based conjugate of the formula Vm-D-C-D′-(T-F)n, which is useful for tumor targeting drug delivery. The use of asymmetric dendrimers allow for specific targeting as well as synthetic reproducibility.

The present invention relates to novel dendrimer compounds and methods of synthesizing the same. In particular, the present invention is directed to novel polyamidoamine (PAMAM) dendrimers, novel dendrimer branching units, methods for synthesizing such novel PAMAM dendrimers and functionalized dendrimers, as well as systems and methods utilizing the dendrimers (e.g., in diagnostic and / or therapeutic settings (e.g., for the delivery of therapeutics, imaging, and / or targeting agents (e.g., in disease diagnosis and / or therapy, etc.))).

The invention discloses a quantum dot light emitting diode and a preparation method thereof, wherein the quantum dot light emitting diode comprises a cathode, an anode and a quantum dot light emitting layer arranged between the cathode and the anode, and the quantum dot light emitting layer is made of materials. It is a mixed material composed of quantum dots and oil-soluble PAMAM dendrimers, and the exciton Bohr radius of the quantum dots is larger than the diameter of the quantum dots. In the present invention, the spatial distance between the quantum dots in the quantum dot light-emitting layer will be effectively pulled apart by the oil-soluble PAMAM dendrimers, thereby effectively reducing the energy transfer between the quantum dots, and indirectly improving the The fluorescence intensity of the quantum dot light-emitting layer; in addition, the oil-soluble PAMAM dendrimer can be wrapped on the surface of the quantum dot to bind the excitons, thereby improving the quantum yield of the quantum dot light-emitting layer, thereby improving the quantum dot light-emitting diode. Luminous efficiency.

The invention discloses a quantum dot light-emitting diode and a preparation method thereof, wherein the quantum dot light-emitting diode comprises a cathode, an anode and a quantum dot light-emitting layer arranged between the cathode and the anode, and is characterized in that the anode and the anode A first refraction layer is arranged between the quantum dot luminescent layer, a second refraction layer is arranged between the cathode and the quantum dot luminescent layer, and the material of the first refraction layer is a first PAMAM dendrimer, and the The second refraction layer material is a composite material, and the composite material includes a second PAMAM dendrimer and metal atom clusters combined in the cavity of the second PAMAM dendrimer, and the algebra of the first PAMAM dendrimer is less than The algebra of the second PAMAM dendrimer. The present invention can effectively improve the light extraction efficiency and stability of the quantum dot light-emitting diode by arranging the first refraction layer between the anode and the quantum dot light-emitting layer, and the second refraction layer between the cathode and the quantum dot light-emitting layer .

The invention discloses a catalyst for producing succinic anhydride by hydrogenation of maleic anhydride and a preparation method thereof. The catalyst is prepared by adopting dendritic supramolecular polyamide-amine PAMAM dispersion and wet reduction method with a nanometer iron content of 0.1-15wt %, the carrier is a loaded nano-iron catalyst of PHTS or Al-PHTS. The preparation method is as follows: impregnating PHTS or Al-PHTS carrier with an impregnating liquid prepared by supramolecular dendrimer PAMAM and active metal iron salt, and obtaining it after borohydride wet reduction and vacuum drying. The catalyst catalyzes the hydrogenation of maleic anhydride to prepare succinic anhydride, the conversion rate of maleic anhydride is greater than 90.5 percent, and the selectivity of succinic anhydride is greater than 99.0 percent. The catalyst has the advantages of high activity, good selectivity, low cost and environmental friendliness.