The present invention relates to a method for preparing an ultrafiltration membrane with high mechanical property. In the present invention, since the cellulose, which has high mechanical property, is added into the casting membrane solution, the retention rate of the ultrafiltration membrane of the present invention is improved.

Provided is a porous membrane that can be manufactured in uncomplicated steps, has high hydrophilicity and water permeability, and exhibits excellent anti-fouling properties when used in a membrane bioreactor method (MBR method). The porous membrane of the present invention is a porous membrane containing polymer (A) and polymer (B), wherein the polymer (A) is a membrane-forming polymer, the polymer (B) is a polymer having a unit (b1) represented by formula (1) and a unit (b2) based on hydroxyl group-containing (meth)acrylate, and the concentration (mass %) of the unit (b1) is equal to or higher than the concentration (mass %) of the unit (b2) in the porous membrane.

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Asymmetric films, methods of making asymmetric films, and uses of asymmetric films. A method may include using at least two different solvents and at least one homopolymer and at least one block copolymer that can undergo self assembly, where the solvents are immiscible and have different surface tension, where, on film formation, all or substantially all of the block copolymer(s) migrate to an exterior surface of the homopolymer. The asymmetric films may include an isoporous region or layer and an asymmetric region or layer, where the asymmetric region does not include 10 percent by weight or more of the multiblock copolymer(s) and/or the isoporous region/layer and the asymmetric pore region/layer are not independently (or separately) formed and/or not laminated together to form the asymmetric film. The films can be used in devices, such as, for example, filtration devices.

The present disclosure relates to an anticoagulant-coated microporous hollow fiber membrane showing reduced thrombogenicity. The disclosure further relates to a method for producing the membrane and a filtration and/or diffusion device comprising the membrane.

Disclosed are apparatus and methods for blood and other biological fluid purification using a membrane with cell containing vascular channel systems and filtration channel systems. Also disclosed are methods of making the apparatus as well as methods of making membranes.

Disclosed is a method of preparing a filtration membrane. The method includes providing a copolymer solution by dissolving a statistical copolymer in a mixture of a co-solvent and a first organic solvent, coating the copolymer solution onto a porous support layer to form a polymeric layer thereon, coagulating the polymeric layer on top of the support layer to form a thin film composite membrane, and immersing the thin film composite membrane into a water bath to obtain a filtration membrane. Also disclosed are a filtration membrane prepared by the method, and a process of filtering a liquid using the filtration membrane thus prepared.

In the production of a polyphenylsulfone porous hollow fiber membrane by a wet spinning method or a dry-wet spinning method using a spinning dope comprising a water-soluble organic solvent solution of polyphenylsulfone, hydrophilic polyvinylpyrrolidone, and ethylene glycol, wherein N,N-dimethylformamide with a concentration of 70 to 100 wt. %, preferably 85 to 100 wt. %, more preferably 100 wt. %, is used as a core liquid. The resulting porous hollow fiber membrane enables stable production without imposing burdens on the environment and provides a water purification membrane having high water permeability and excellent filtration performance.

The invention provides systems and methods for substantially improving the compaction resistance of isoporous block copolymer (BCP) film by adding a high molecular weight hydrophilic additive in the casting dope formulation. Systems and methods disclosed also disclose several other multifunctional enhancements to film properties including: low fouling propensity, improved permeability, improved permeability retention upon drying, and ability to tune the substructure and pore size of these novel BCP films. These porous BCP films are useful in filtration and separations applications and are amenable to standard manufacturing practices.

A hollow fiber membrane and a method of preparing the same. The hollow fiber membrane has an inner surface and an outer surface, wherein the inner surface has a zebra-stripe pattern in which a dense portion and a porous portion are alternately formed in a longitudinal direction of the hollow fiber membrane.

A high-flux composite nanofiltration (NF) membrane with an electrical double layer (EDL) and a preparation method thereof are provided. The high-flux composite NF membrane includes: a charged support membrane and a charged separation layer, where a charge carried by the support membrane or the separation layer is a positive charge, a negative charge, or an amphiprotic charge. The high-flux composite NF membrane with an EDL solves the technical problem that the composite NF membrane in the prior art has an unsatisfactory retention rate and a limited application range due to a small charge quantity.