The present invention relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as ammonium group, phosphonium group, imidazolium group, pyridinium group and sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

The present invention relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as ammonium group, phosphonium group, imidazolium group, pyridinium group and sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

Track-etched membranes for filtration are provided. Filtration methods utilizing such membranes and cell culture methods are also provided.

Track-etched membranes for filtration are provided. Filtration methods utilizing such membranes and cell culture methods are also provided.

A semipermeable membrane support having a thickness difference between measurement thickness at 0.80 N/cm.sup.2 and measurement thickness at 1.27 N/cm.sup.2 of 1.0 to 5.0% is excellent in adhesion to a semipermeable membrane and also adhesion between a raw water spacer and the semipermeable membrane and thereby can be expected to maintain high water permeability after modulation. A method of producing a semipermeable membrane support comprises the step of carrying out hot-press processing by using an elastic roll, which has(have) a hardness between a type A durometer hardness of 60 or more and a type D durometer hardness of 95 or less.

Disclosed herein is a gas separation membrane comprising a furan-based polymer, an apparatus comprising the gas separation membrane, and a process for separating a mixture of gases using said gas separation membrane. The process comprises contacting one side of a gas separation membrane comprising a furan-based polymer with a mixture of gases having different gas permeances, whereby at least one gas from the mixture of gases permeates preferentially across the gas separation membrane, thereby separating the at least one gas from the mixture of gases.

Disclosed herein is a gas separation membrane comprising a furan-based polymer, an apparatus comprising the gas separation membrane, and a process for separating a mixture of gases using said gas separation membrane. The process comprises contacting one side of a gas separation membrane comprising a furan-based polymer with a mixture of gases having different gas permeances, whereby at least one gas from the mixture of gases permeates preferentially across the gas separation membrane, thereby separating the at least one gas from the mixture of gases.

The present inventive concept relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as an ammonium group, a phosphonium group, an imidazolium group, a pyridinium group and a sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

The present inventive concept relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as an ammonium group, a phosphonium group, an imidazolium group, a pyridinium group and a sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

The present invention provides a particle-coated fiber comprising a fiber and particles coated on the fiber, and a method for forming the same. The method comprises: providing a suspension comprising the particles; providing a polymer solution for forming the fiber; electrospraying the suspension toward an area of a collector; and during the electrospraying of the suspension, electrospinning the polymer solution into the fiber and directing the fiber toward the area so as to meet with the suspension on the area and on the way to the area such that the particles are coated on the fiber during and after the formation of the fiber thereby forming the particle-coated fiber on the area. By the present method, the particles can be crowed on the surface of the fiber, and the adhesiveness between the fiber and the particles can be substantially enhanced.