The invention relates to novel linear, semi-crystalline, functional fluoropolymers that have been obtained by copolymerizing a fluorinated vinylic monomer and a hydrophilic monomer chosen from vinyl alkyl acids, vinyl phosphonates, functional acrylamides, carbonates, vinyl ethers, alkoxy compounds, and double hydrophilic group monomers.

A method for fractionating a liquid include contacting a liquid comprising at least one type of encapsulating particle with at least one mesoporous isoporous block copolymer material, wherein at least one component of the liquid is separated. A device for fractionating a liquid having encapsulating particles includes at least one mesoporous isoporous block copolymer material. The device can further include an inlet to allow the liquid to contact the mesoporous isoporous block copolymer material, and an outlet to allow passage of the fractionated liquid. In some instances, the device can be a pleated capsule, a flat sheet cassette, a spiral wound module, a hollow fiber module, a syringe filter, a microcentrifuge tube, a centrifuge tube, a spin column, a multiple well plate, a vacuum filter, a flat sheet, or a pipette tip.

A monolayer membrane containing gelling polymer particles having at least one of a basic functional group and an acidic functional group, and having a thickness of less than 5 μm. A composite having a porous carrier and gelling polymer particles having at least any one of a basic functional group and an acidic functional group and filling up the surface pores of the porous carrier. The invention can provide a novel material capable of efficiently separating an acid gas from a mixed gas.

A monolayer membrane containing gelling polymer particles having at least one of a basic functional group and an acidic functional group, and having a thickness of less than 5 μm. A composite having a porous carrier and gelling polymer particles having at least any one of a basic functional group and an acidic functional group and filling up the surface pores of the porous carrier. The invention can provide a novel material capable of efficiently separating an acid gas from a mixed gas.

Hydrophobic hollow-fiber membrane made from a vinylidene fluoride polymer with a wall and a wall thickness, an outer surface on its outer side, an inner surface on its inner side and facing its lumen and adjacent to the inner surface a supporting layer having a structure that is substantially isotropic across the wall thickness, the supporting layer extending over at least 80% of the wall thickness and comprising pores having an average diameter of less than 1 m, and wherein the hollow-fiber membrane has pores on its outer surface and on its inner surface, characterized in that the vinylidene fluoride polymer has a weight-average molecular weight M.sub.W in the range from 550 000 to 700 000 daltons and a polydispersivity greater than 3.0; the pores in the outer and in the inner surface are formed like islands and have a maximum ratio of their longitudinal extension to the transverse extension of 10; the porosity lies in the range from 50 to 90 vol. %, the wall thickness in the range from 50 to 300 m, and the diameter of the lumen in the range from 100 to 500 m; and the hollow-fiber membrane has a maximum separating pore diameter d.sub.max in the range from 0.3 to 0.7 m, determined according to the bubble point method.

Hydrophobic hollow-fiber membrane made from a vinylidene fluoride polymer with a wall and a wall thickness, an outer surface on its outer side, an inner surface on its inner side and facing its lumen and adjacent to the inner surface a supporting layer having a structure that is substantially isotropic across the wall thickness, the supporting layer extending over at least 80% of the wall thickness and comprising pores having an average diameter of less than 1 m, and wherein the hollow-fiber membrane has pores on its outer surface and on its inner surface, characterized in that the vinylidene fluoride polymer has a weight-average molecular weight M.sub.W in the range from 550 000 to 700 000 daltons and a polydispersivity greater than 3.0; the pores in the outer and in the inner surface are formed like islands and have a maximum ratio of their longitudinal extension to the transverse extension of 10; the porosity lies in the range from 50 to 90 vol. %, the wall thickness in the range from 50 to 300 m, and the diameter of the lumen in the range from 100 to 500 m; and the hollow-fiber membrane has a maximum separating pore diameter d.sub.max in the range from 0.3 to 0.7 m, determined according to the bubble point method.

Disclosed is a statistical copolymer that includes both zwitterionic repeat units and hydrophobic repeat units, and a filtration membrane that contains a selective layer formed of the statistical copolymer. Also disclosed are methods of preparing the above-described filtration membrane.

Disclosed is a statistical copolymer that includes both zwitterionic repeat units and hydrophobic repeat units, and a filtration membrane that contains a selective layer formed of the statistical copolymer. Also disclosed are methods of preparing the above-described filtration membrane.

Filter media, filter devices and methods of making filter media are disclosed. The filter media includes a coating on at least a portion of said outer surface. The coating may be polymeric composition having a molecular chain that includes segments of non-polar groups and segments of at least one of polar groups or segments of ionic groups.

Filter media, filter devices and methods of making filter media are disclosed. The filter media includes a coating on at least a portion of said outer surface. The coating may be polymeric composition having a molecular chain that includes segments of non-polar groups and segments of at least one of polar groups or segments of ionic groups.