The present disclosure relates to a microporous hollow fiber filter membrane having a large inner diameter and a thin wall. The fiber can be used for sterile filtration of liquids or removal of particles from liquids. The disclosure further relates to a method for producing the membrane and a filter device comprising the membrane.

An asymmetric hydrophobic polyolefin hollow fiber membrane includes a support layer and a separation layer, the separation layer including an outer surface, the outer surface including a quantity of first pores with a certain pore size; presence of the first pores facilitates an anesthetic gas such as sevoflurane and remifentanil to permeate through the hollow fiber membrane into the human blood, allowing for the patient to maintain sedated throughout a surgical process; meanwhile, the first pores facilitate reduction of dosage of the anesthetic in the surgery, thereby reducing surgical costs and avoid overdosage of the anesthetic causing secondary impairment to the patient; in addition, the hollow fiber membrane offers a long plasma permeation duration, a high tensile strength and a high elongation at break to satisfy application needs, particularly suitable for human blood oxygenation including anesthetic gas and the gas-liquid separation areas.

Disclosed herein are compositions for permeable outer diffusion control membranes for creatinine and creatine sensors and methods of making such membranes.

The invention relates to a method for manufacturing a dialysis filter comprising fluorine-containing hollow fiber membranes, the fluorine-containing hollow fiber membranes being made by a method comprising at least steps (A) to (C): (A) preparing a spinning solution comprising an aprotic solvent, a hydrophobic base polymer, a hydrophilic polymer, and a fluorine-comprising surface modifying macromolecule in a concentration less than 1.12% w/w; (B) extruding said spinning solution from an outer annular orifice through a tube-in-orifice spinneret into an aqueous solution, and (C) isolating the formed hollow fiber membrane,
characterized in that the manufacturing of the dialysis filter comprises a steam sterilization procedure. The invention is further related to dialysis filter comprising a fluorine-containing hollow fiber membrane comprising a hydrophobic base polymer, a hydrophilic polymer and a fluorine-comprising surface modifying macromolecule in a concentration less than 3.6% w/w, based on the total weight of the fluorine-containing hollow fiber membrane.

A process for preparing a porous film of a fluoropolymer, including the following steps: the provision of an ink including the fluoropolymer and a vehicle including a solvent for the fluoropolymer and a nonsolvent for the fluoropolymer, the solvent for the fluoropolymer and the nonsolvent for the fluoropolymer being mutually miscible; the deposition of the ink on a substrate; the evaporation of the vehicle comprising the solvent and the nonsolvent.

A preparation method of separation membrane is provided. First, a polyimide composition including a dissolvable polyimide, a crosslinking agent and a solvent is provided. The dissolvable polyimide is represented by formula 1: ##STR00001## wherein B is a tetravalent organic group derived from a tetracarboxylic dianhydride containing aromatic group, A is a divalent organic group derived from a diamine containing aromatic group, A′ is a divalent organic group derived from a diamine containing aromatic group and carboxylic acid group, and 0.1≤X≤0.9. The crosslinking agent is an aziridine crosslinking agent, an isocyanate crosslinking agent, an epoxy crosslinking agent, a diamine crosslinking agent, or a triamine crosslinking agent. A crosslinking process is performed on the polyimide composition. The polyimide composition which has been subjected to the crosslinking process is coated on a substrate to form a polyimide membrane. A wet phase inversion process is performed on the polyimide membrane.

[Problem to be Solved]

Provided is a polyvinylidene fluoride resin-made porous membrane having excellent hydrophilicity, permeability, and fouling resistance and having suppressed elution of vinyl ether copolymer by using a small amount of vinyl ether copolymer.

[Means to Solve the Problem]

The porous membrane according to the invention comprises a polyvinylidene fluoride resin as a matrix material and a vinyl ether copolymer, wherein the vinyl ether copolymer is a copolymer of an oxyethylene group-containing vinyl ether monomer and a hydrocarbon group-containing vinyl ether monomer.

A porous membrane includes a modacrylic copolymer. The modacrylic copolymer includes, with respect to 100 parts by mass of all structural units constituting the modacrylic copolymer, 15 to 85 parts by mass of a structural unit derived from acrylonitrile, 15 to 85 parts by mass of a structural unit derived from at least one halogen-containing monomer selected from the group consisting of vinyl halide and vinylidene halide, and 0 to 10 parts by mass of a structural unit derived from a vinyl monomer having an ionic substituent. The porous membrane can be produced by preparing a modacrylic copolymer solution by dissolving the modacrylic copolymer in a solvent, and bringing the modacrylic copolymer solution into contact with a non-solvent for the modacrylic copolymer such that the modacrylic copolymer solution is solidified.

An anion exchange membrane is made by mixing 2 trifluoroMethyl Ketone [nominal] (1.12 g, 4.53 mmol), 1 Biphenyl (0.70 g, 4.53 mmol), methylene chloride (3.0 mL), trifluoromethanesulfonic acid (TFSA) (3.0 mL) to produce a pre-polymer. The pre-polymer is then functionalized to produce an anion exchange polymer. The pre-polymer may be functionalized with trimethylamine in solution with water. The pre-polymer may be imbibed into a porous scaffold material, such as expanded polytetrafluoroethylene to produce a composite anion exchange membrane.

The present disclosure provides the synthesis of an imidazolium-based functional ionic liquid copolymer (PMMA-b-PIL-R*) and a preparation method of an alloy ultra-filtration membrane. Firstly, PMMA-b-PIL-R* is prepared from methyl methacrylate (MMA) and polymerizable imidazolium-based functional ionic liquid (IL-R*) containing double bonding as the reactive monomers through sequential radical polymerization. With the use of a non-solvent induced phase separation method, PMMA-b-PIL-R* is introduced into the body of a polymeric membrane material, so as to prepare an alloy ultra-filtration membrane. A hydrogen-bond interaction is generated between the carbonyl in the molecular chain of PMMA-b-PIL-R* and the H . . . C—Cl structure in the molecular chain of the polymeric membrane material, which enhances the compatibility between the molecular chains of PMMA-b-PIL-R* and the polymeric membrane material, so that it can be stable in the ultra-filtration membrane; the imidazole groups and functional groups in the molecular chain of PMMA-b-PIL-R* can provide a good hydrophilicity.