Provided are a polyethylene microporous membrane, a method for manufacturing the same, and a separator including the microporous membrane. According to an embodiment, a polyethylene microporous membrane which has a thickness of 3 m to 30 m, a puncture strength of 0.15 N/m or more, a shrinkage rate in the transverse direction of 5% or less as measured after being allowed to stand at 121 C. for 1 hour, and a PS index represented by the following Equation 1 of 110 or more is provided:

[00001]$\begin{array}{cc}& \left[\mathrm{Equation}1\right]\end{array}$$\mathrm{PS}\mathrm{index}=\left[\mathrm{gas}\mathrm{permeability}\left({10}^{-5}\mathrm{Darcy}\right)\mathrm{porosity}\left(\%\right)\right]\left[\mathrm{shrinkage}\mathrm{rate}\left(\%\right)\mathrm{in}\mathrm{the}\mathrm{transverse}\mathrm{direction}\mathrm{at}121C.\right].$

Described are liquid-flowable, porous polyethylene filter membranes that include two opposing sides and that have an asymmetric pore structure; filter components and filters that include this type of porous polyethylene filter membrane; methods of making the porous polyethylene filter membranes, filter components, and filters; and methods of using a porous polyethylene filter membrane, filter component, or filter, to filter a fluid such as a liquid chemical to remove unwanted material from the fluid.

There are provided a porous membrane including a perfluoroalkoxy alkane (PFA)-based melt-extruded film and having pores controlled by biaxial stretching, and a manufacturing method therefore. The porous membrane is for water treatment and includes a fluoropolymer. The method includes forming a film by melt-extruding a fluoropolymer; and controlling the pore size of the formed film by biaxial stretching. The membrane for water treatment is based on a fluoropolymer and has physical properties that are resistant to high temperatures and strong acids, and it is able to be used for treatment of wastewater such as semiconductor wastewater.

A degassing method of removing a dissolved gas from a liquid and a gas exchange method of exchanging a dissolved gas in a liquid and a gas component in a gas phase include a method using a separation membrane. To provide a separation membrane having solvent resistance while maintaining high gas permeability using poly(4-methyl-1-pentene) excellent in solvent resistance and gas permeability. To achieve the object, there is provided a separation membrane containing poly(4-methyl-1-pentene) as a main component and including a surface layer and an inner layer, at least one surface layer having lamellar crystals, wherein micropores are provided on the surface layer having the lamellar crystals, an opening ratio is 0.1% to 10% when a ratio of the micropores to a membrane surface is taken as the opening ratio and the membrane surface is 100%, and an average pore size of the micropores is 3 nm to 30 nm.

A method of manufacturing a carbon molecular sieve (CMS) membrane includes forming one or more hollow fibers, the one or more hollow fibers including a polyvinylidene chloride copolymer; exposing the one or more hollow fibers to a caustic solution, wherein the caustic solution includes a strong base and a solvent; applying a tension at opposite ends of the one or more hollow fibers, thereby maintaining the one or more hollow fibers in a straight shape; pretreating the one or more hollow fibers under the tension by heating at a first temperature of from 120 C. to 200 C. with air, an inert gas, or combinations thereof; pyrolyzing the one or more hollow fibers at a second temperature of from 500 C. to 1500 C. with inert gas; and bundling the one or more hollow fibers to form the CMS membrane.

A separation membrane has high strength and low leakage property while maintaining high gas permeability using poly(4-methyl-1-pentene) excellent in chemical resistance and gas permeability. The separation membrane contains poly(4-methyl-1-pentene) as a main component, in which a ratio RA of a rigid amorphous of poly(4-methyl-1-pentene) in the separation membrane is 43% or more and 60% or less, a porosity is 30% or more and 70% or less, and a dense layer is provided on at least one surface.

The invention is directed to a mash filter membrane comprising an elastomeric composition that comprises more than 50 wt % of one or more elastomer, based on the total weight of polymers in the elastomeric composition.

The object of the present invention is polyphenylene oxide based film with crystalline nanoporous phases with surface area equal to or greater than 30 m2/g, preferably greater than 100 m2/g, and a procedure for the attainment thereof.

A recyclable waterproofing membrane has a bituminous binder with a recycled bituminous binder (RBB), optionally a fresh polymer and optionally fresh bitumen and a reinforcement. The bituminous binder has a rejuvenator selected from the group consisting of bio-based oils and/or mineral oils, such as plant-based, pine-oil based or vegetable-oil-based. The recycled bituminous binder is obtained by grinding and melting waterproofing membranes with bituminous binder, polymers and a reinforcement.