The present invention relates to cellulose based papers coated with nitrocellulose as well as to methods for producing such coated papers and methods for using them, especially in lateral flow applications.

The present invention relates to a membrane (M) comprising an amorphous polymer (P) comprising repeat units of the formulas (RU1), (RU2) and (RU3). Moreover, the present invention relates to a process for the preparation of said membrane (M) and a filtration process, wherein a liquid permeates said membrane (M).

An object of the present invention is to provide a polyamide porous membrane having improved fluid permeation performance. A polyamide porous membrane having a dense layer formed on at least one surface, wherein the polyamide porous membrane has a streak-like recessed portion extending in one direction of a surface of the dense layer, and the streak-like recessed portion has an orientation angle of 0 to 5.0° or 175.0 to 180.0° and an orientation intensity of 1.5 to 2.0 according to predetermined orientation analysis.

A polymer composition for producing gel extruded articles is described. The polymer composition contains polyethylene particles combined with a plasticizer and one or more surface tension reducing techniques. In one aspect, the surface tension reducing technique includes adding a filler or chemical component to the polyethylene polymer for increasing wettability. Alternatively, the surface tension reducing technique can be a surface treatment, such as a plasma treatment. Polymer articles made in accordance with the present disclosure can have dramatically increased wettability properties. In one embodiment, the polymer composition is used to form a porous membrane for use as a separator in electronic devices.

Multicomponent copolymers including two or more types of repeat units is presented. In one example, the multicomponent copolymer includes at least one repeat unit AC having a structure (I), at least one repeat unit DC having a structure (II), and at least one repeat unit BC having a structure (III) or (V). The multicomponent copolymer may be cross-linked via a cross-linking agent. A polymer blend including the multicomponent copolymer or a cross-linked copolymer and a second polymer is also provided. The multicomponent copolymer may be a random or a block copolymer. The structural units of the multicomponent copolymers provide improved, tunable properties, such as improved biocompatibility and hydrophilicity, protein fouling, and mechanical properties, to the copolymers and/or the membranes fabricated from the copolymers.

The present invention relates to a process for producing a fluoropolymer article having a high surface roughness and high coarseness which comprises the following steps: a) forming a paste comprising a fluoropolymer into a paste-formed fluoropolymer product at a temperature lower than 50° C., b) densifying the paste-formed product, and c) stretching the densified paste-formed fluoropolymer product in at least one direction. The present invention further relates to a fluoropolymer article obtainable by a process according to the invention. The present invention furthermore relates to a fiber comprising, or consisting of, a fluoropolymer having a surface roughness expressed as a peak to valley distance (Rt) greater than 10 micrometer and/or an average surface roughness (Ra) greater than 1.5 micrometer. The present invention furthermore relates to a membrane comprising, or consisting of, a fluoropolymer having a coarseness index ρ/EBP of at least 0.3, an air permeability of 15 ft.sup.3/ft.sup.2/min or higher and a node aspect ratio of below 25.

A separator for alkaline water electrolysis (1) comprising a porous hydrophilic polymer layer (20), the porous hydrophilic polymer layer comprising a polymer resin and hydrophilic inorganic particles, characterized in that the inorganic particles are barium-sulfate particles having a particle size D50 of 0.7 pm or less.

Multicomponent copolymers including two or more types of repeat units is presented. In one example, the multicomponent copolymer includes at least one repeat unit AC having a structure (I), at least one repeat unit DC having a structure (II), and at least one repeat unit BC having a structure (III) or (V). The multicomponent copolymer may be cross-linked via a cross-linking agent. A polymer blend including the multicomponent copolymer or a cross-linked copolymer and a second polymer is also provided. The multicomponent copolymer may be a random or a block copolymer. The structural units of the multicomponent copolymers provide improved, tunable properties, such as improved biocompatibility and hydrophilicity, protein fouling, and mechanical properties, to the copolymers and/or the membranes fabricated from the copolymers.

Disclosed herein are bio-based polysulfones, and in particular, bisguaiacol-based PSfs synthesized from (i) at least one polymerizable lignin-based monomer having a structure corresponding to formula (I) wherein each R.sup.1 is independently either an H or a methyl group, wherein R.sup.2, R.sup.3, and R.sup.4 are each individually selected from an H or a methoxy group, and (ii) at least one polymerizable 4,4′-dihalophenyl sulfone as a comonomer. Also, disclosed herein are compositions comprising the bio-based polysulfones and a membrane comprising the composition

##STR00001##

A superhydrophobic polypropylene porous film, including a polypropylene porous film substrate, titanium dioxide layers and a surface modifier layer, is disclosed. The titanium dioxide layers are deposited on the surface of the polypropylene porous film substrate by atomic deposition technology; a surface modifier is coated on the titanium dioxide layers; hydrophobic bonds are formed between the titanium dioxide layers and the surface modifier layer; the superhydrophobic polypropylene porous film has a water contact angle greater than 150 degrees, a rolling angle less than 10 degrees, an aperture of 0.1-0.4 μm, a porosity of 50%-80%, a tensile strength of 30-50 MPa, and an elongation at break of 10%-30%. The superhydrophobic polypropylene porous film maintains the chemical resistance, rigidity, and porosity of the polypropylene porous film, and has superhydrophobic properties and a good separation effect after working for 80 hours, thus greatly increasing the service life, and reducing operation costs and working costs in a membrane distillation process.