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.

A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition.

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A method for making a nanoporous membrane is disclosed. The method provides a composite film comprising an atomically thin material layer and a polymer layer, and then bombarding the composite film with energetic particles to form a plurality of pores through at least the atomically thin material layer. The nanoporous membrane also has a atomically thin material layer with a plurality of apertures therethrough and a polymer film layer adjacent one side of the graphene layer. The polymer film layer has a plurality of enlarged pores therethrough, which are aligned with the plurality of apertures. All of the enlarged pores may be concentrically aligned with all the apertures. In one embodiment the atomically thin material layer is graphene.

A separation membrane includes a membrane comprising a polymer, characterized in that a functional layer is formed on the surface in one side of the membrane, the peak area percentage of carbon derived from ester group measured by the electron spectroscopy for chemical analysis (ESCA) on the surface of the preceding functional layer is 0.1% (by atomic number) or more but not more than 10 (% by atomic number), and the peak area percentage of carbon derived from ester group measured by the electron spectroscopy for chemical analysis (ESCA) on the surface opposite to the functional layer is not more than 10 (% by atomic number). A separation membrane module suffering from little sticking of organic matters, proteins, platelets and so on is provided with the separation membrane as a built-in membrane.

The problem is to provide a porous membrane with a reduced phenomenon in which membranes firmly adhere to one another during production of the porous membrane (membrane adhesion). The problem is solved by a porous membrane comprising a hydrophobic polymer and a hydrophilic polymer, wherein an average value T of ratios of the number of counts of ions derived from the hydrophilic polymer to the number of counts of ions derived from the hydrophobic polymer is 1.0 or more when a surface of the porous membrane is measured by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

The problem is to provide a porous membrane with a reduced phenomenon in which membranes firmly adhere to one another during production of the porous membrane (membrane adhesion). The problem is solved by a porous membrane comprising a hydrophobic polymer and a hydrophilic polymer, wherein an average value T of ratios of the number of counts of ions derived from the hydrophilic polymer to the number of counts of ions derived from the hydrophobic polymer is 1.0 or more when a surface of the porous membrane is measured by time-of-flight secondary ion mass spectrometry (TOF-SIMS).

The present invention pertains to composition suitable for manufacturing membranes based on vinylidene fluoride (VDF) polymers, to porous membranes thereof, to methods for their manufacture and to uses thereof, especially for the filtration of water phases. Said composition comprising vinylidene fluoride (VDF) polymers and polymer additives comprising zwitterionic moieties delivers outstanding hydrophilization performances of manufactured membranes.

This disclosure generally relates to polymeric materials designed to create membranes with improved selectivity and fouling resistance, with potential capabilities that include tunable effective pore size that can be reduced to, for example, <1 nm, exceptional fouling resistance, improved chemical resistance and thermal stability, and ion selectivity. Specifically, this disclosure relates to cross-linkable and charged zwitterionic polymers and membranes made therefrom for reverse osmosis applications.

The present invention provides a new pervaporation membrane suitable for separating a volatile organic compound from an aqueous solution containing the organic compound. A pervaporation membrane of the present invention includes: a separation functional layer; and a porous support supporting the separation functional layer. The porous support has a surface facing the separation functional layer, the surface including a plurality of opening portions. An average diameter of the opening portions is 0.5 m or more. For the pervaporation membrane, a peeling strength measured by a test below is 0.15 N/20 mm or more. Test: The pervaporation membrane is cut to 20 mm in width and 150 mm in length to give a test piece. The separation functional layer of the test piece is peeled off the porous support of the test piece at a peel angle of 180 and a tensile speed of 300 mm/min.

A nonwoven web obtained by electrospinning, suitable for the filtration of nano- and/or submicron aerosols, including a multiplicity of fibers of composition C1, the composition C1 including at least 50% by weight of at least one polymer P1 based on the repeat unit resulting from vinylidene fluoride (VDF), the fibers of composition C1 having a degree of crystallinity in polar phase(s), preferentially in solely beta phase, of at least 65% by weight, with respect to their total weight. Also, a process for the manufacture of the web, to a membrane including the web and also to a process for the washing/sterilization of the web or of the membrane.