Abstract: The present disclosure relates to a polymer electrolyte membrane having a construction wherein an ionomer is charged in pores of a nanoweb having a high melting point, being insoluble in an organic solvent and having excellent pore characteristics, under optimum conditions. Therefore, an overall thickness of the electrolyte membrane may be reduced, thereby attaining advantages such as decrease in ohmic loss, reduction of material costs, excellent heat resistance, low thickness expansion rate which in turn prevents proton conductivity from being deteriorated over a long term. The polymer electrolyte membrane of the present invention comprises a porous nanoweb having a melting point of 300? or more and being insoluble in an organic solvent of NMP, DMF, DMA, or DMSO at room temperature; and an ionomer which is charged in pores of the porous nanoweb and contains a hydrocarbon material soluble in the organic solvent at room temperature.

Abstract: Disclosed is a humidifier for fuel cell, which facilitates to maximize humidifying performance and reducing the maintenance cost through the uniform humidification among all the hollow fiber membranes by preventing high-humidity unreacted gas introduced to the inside of membrane housing from flowing concentratedly toward a specific region in the membrane housing, wherein the humidifier comprises a membrane housing; a partition plate for dividing an inner space of the membrane housing into plural unit spaces; plural hollow fiber membranes in each of the unit spaces; and a cover mounted on an end of the membrane housing, the cover including an inlet for introducing unreacted gas of high-humidity discharged from a stack into the membrane housing, wherein plural distribution holes are provided in the membrane housing, the distribution holes corresponding to the unit spaces respectively.

Abstract: Disclosed are a pressurized-type hollow fiber membrane module having a pressure resistance higher than 3 kgf/cm2 and a filtration system comprising the same. The pressurized-type hollow fiber membrane module comprises: a body case having an open end; a fixing member disposed in the body case at the open end; a hollow fiber membrane potted in the fixing member; and a cap on the open end of the body case, the cap and fixing member forming a filtrate-collecting space, wherein a lumen of the hollow fiber membrane is in fluid communication with the filtrate-collecting space, the fixing member has a step so that an upper side surface of the fixing member is not in contact with an inner surface of the body case, and a portion of the cap is inserted in a groove defined by the step of the fixing member and the inner surface of the body case.

Abstract: Disclosed is a pressurized hollow fiber membrane module that exhibits improved durability without deterioration in packing density and permeation flux. The pressurized hollow fiber membrane module includes a composite hollow fiber membrane comprising a tubular braid woven by yarns and a polymer film on the outer surface of the tubular braid. At least one of the yarns comprises a small-fineness filament and a medium-fineness filament. The small-fineness filament comprises first monofilaments having a fineness of 0.01 to 0.4 denier, the medium-fineness filament comprises second monofilaments having a fineness higher than 0.4 and lower than 3, and a ratio of thickness of the tubular braid to outer diameter thereof is 15 to 35%.

Abstract: A hollow fiber membrane module is disclosed, which is capable of preventing a bundle of hollow fiber membranes from being separated from a module case, the hollow fiber membrane module for accommodating a bundle of hollow fiber membranes closely held together through the use of potting agent, including a module case including: a first inner surface serving as a projection on which the bundle of hollow fiber membranes is stably placed; a second inner surface upwardly extending from one end of the first inner surface, the second inner surface including at least one separation-preventing groove to prevent the bundle of hollow fiber membranes from being separated from the module case; a third inner surface downwardly extending from the other end of the first inner surface; and a fourth inner surface connected to the third inner surface.

Abstract: Disclosed are a polymer electrolyte membrane, a method for manufacturing the same and a membrane-electrode assembly comprising the same, the polymer electrolyte membrane includes a hydrocarbon-containing ion conductive layer; and a fluorine-containing ion conductor discontinuously dispersed on the hydrocarbon-containing ion conductive layer.

Abstract: Disclosed are a polymer electrolyte membrane showing high ion conductivity even under the condition of low humidity and high temperature and a method for manufacturing the same. The polymer electrolyte membrane of the present invention comprises a porous substrate, a self proton conducting material dispersed in the porous substrate, and an ion conductor impregnated in the porous substrate. The self proton conducting material comprises an inorganic particle functionalized with an azole ring.

Abstract: Disclosed is a pressurized hollow fiber membrane module that exhibits improved durability without deterioration in packing density and permeation flux. The pressurized hollow fiber membrane module includes a composite hollow fiber membrane comprising a tubular braid woven by yarns and a polymer film on the outer surface of the tubular braid. At least one of the yarns comprises a small-fineness filament and a medium-fineness filament. The small-fineness filament comprises first monofilaments having a fineness of 0.01 to 0.4 denier, the medium-fineness filament comprises second monofilaments having a fineness higher than 0.4 and lower than 3, and a ratio of thickness of the tubular braid to outer diameter thereof is 15 to 35%.

Abstract: Disclosed is an energy-saving and eco-friendly filtration system which is capable of minimizing the amount of the energy required for the filtration, thereby remarkably reducing the cost of water treatment. The filtration system of the present invention comprises: a feed water tank for storing a feed water to be treated; a hollow fiber membrane module for filtering the feed water supplied from the feed water tank; and a filtrate tank for storing a filtrate produced by the hollow fiber membrane module, wherein the hollow fiber membrane module comprises a plurality of hollow fiber membranes for filtering the feed water, and the sum of head pressure of the feed water in the feed water tank and water pressure of the filtrate in accordance with siphon principle is higher than the threshold membrane pressure of the hollow fiber membranes.

Abstract: Disclosed are system and method for filtration which can minimize the contamination of the filtering membrane through a pretreatment and perform the pretreatment and the filtration with a filtering membrane in a single filtering unit so that any need for separate and additional space and facility for the pretreatment can be obviated. The system for filtration of the present invention comprises a fine bubble supplier for providing fine bubbles into the feed water. The pretreatment is performed by supplying the feed water to be treated into the filtering unit through a dynamic filtration layer which is formed in the filtering unit as the fine bubbles rise.

Abstract: Provided are a polymer electrolyte membrane used in fuel cells, and a method for producing the same, the method including a step of filling a crosslinkable ion conductor in the pores of a porous nanoweb support; and a step of crosslinking the ion conductor filled in the pores of the porous nanoweb support. The method for producing a polymer electrolyte membrane uses a relatively smaller amount of an organic solvent, can ameliorate defects of the support caused by solvent evaporation, and can enhance the impregnability of the ion conductor to the support and the convenience of the process.

Abstract: Disclosed is a humidifier for a fuel cell having an enhanced humidifying performance and thus being able to prevent an instantaneous decrease of the output of a car which might occur at the time of high-speed driving. The humidifier comprises a membrane housing with first and second ends; a bundle of hollow fiber membranes provided in an inner space of the membrane housing, wherein both ends of the hollow fiber membrane are respectively potted into the first and second ends of the membrane housing; a humidity retainer provided in the inner space of the membrane housing; a first cover mounted on the first end of the membrane housing, the first cover including an inlet for introducing unreacted gas of high-humidity discharged from a stack; and a second cover mounted on the second end of the membrane housing, the second cover including an outlet for discharging the unreacted gas used for humidification.

Abstract: Disclosed is a humidifier for fuel cell which is capable of realizing high humidifying efficiency owing to the maximum contact area of hollow fiber membranes with reaction gas to be supplied to the fuel cell by enabling the uniform humidifying level in all the hollow fiber membranes provided inside the humidifier.

Abstract: Disclosed is a humidifier for fuel cell, which facilitates to maximize humidifying performance and reducing the maintenance cost through the uniform humidification among all the hollow fiber membranes by preventing high-humidity unreacted gas introduced to the inside of membrane housing from flowing concentratedly toward a specific region in the membrane housing, wherein the humidifier comprises a membrane housing; a partition plate for dividing an inner space of the membrane housing into plural unit spaces; plural hollow fiber membranes in each of the unit spaces; and a cover mounted on an end of the membrane housing, the cover including an inlet for introducing unreacted gas of high-humidity discharged from a stack into the membrane housing, wherein plural distribution holes are provided in the membrane housing, the distribution holes corresponding to the unit spaces respectively.

Abstract: The present disclosure relates to a polymer electrolyte membrane having a construction wherein an ionomer is charged in pores of a nanoweb having a high melting point, being insoluble in an organic solvent and having excellent pore characteristics, under optimum conditions. Therefore, an overall thickness of the electrolyte membrane may be reduced, thereby attaining advantages such as decrease in ohmic loss, reduction of material costs, excellent heat resistance, low thickness expansion rate which in turn prevents proton conductivity from being deteriorated over a long term. The polymer electrolyte membrane of the present invention comprises a porous nanoweb having a melting point of 300? or more and being insoluble in an organic solvent of NMP, DMF, DMA, or DMSO at room temperature; and an ionomer which is charged in pores of the porous nanoweb and contains a hydrocarbon material soluble in the organic solvent at room temperature.

Abstract: A tubular braid and a composite hollow fiber membrane using the same are disclosed. The tubular braid is made by braiding yarns, the yarn made by combining thin filament and thick filament, wherein the thin filament is comprised of a plurality of monofilament having a fineness of 0.01 to 0.4 denier, and the thick filament is comprised of at least one monofilament having a fineness of 3 to 50 denier. Also, the composite hollow fiber membrane using the tubular braid of the present invention can realize excellent water permeability, high mechanical strength, good filtration reliability, great peeling strength, low dope permeation, and high stiffness.

Abstract: A hollow fiber membrane module is disclosed, which is capable of preventing a bundle of hollow fiber membranes from being separated from a module case, the hollow fiber membrane module for accommodating a bundle of hollow fiber membranes closely held together through the use of potting agent, including a module case including: a first inner surface serving as a projection on which the bundle of hollow fiber membranes is stably placed; a second inner surface upwardly extending from one end of the first inner surface, the second inner surface including at least one separation-preventing groove to prevent the bundle of hollow fiber membranes from being separated from the module case; a third inner surface downwardly extending from the other end of the first inner surface; and a fourth inner surface connected to the third inner surface.

Abstract: A braid-reinforced composite hollow fiber membrane is disclosed. The braid-reinforced composite hollow fiber membrane comprising a reinforcing material of a tubular braid and a polymer resinous thin film coated on the surface of the tubular braid according to the present invention is characterized in that: the tubular braid comprises multifilaments made of monofilaments having a crimp rate of 2 to 40%, and the peeling strength of the tubular braid and a polymer resinous thin film coated on the surface thereof is 1 to 10 MPa. In the composite hollow fiber membrane, the crimp rate of the monofilaments constituting the tubular braid of the reinforcing material is 2 to 40%, thus the surface area of the tubular braid contacted with the polymer resinous thin film is increased. Thus, the peeling strength of the tubular braid and the polymer resinous thin film coated on the surface thereof is excellent.

Abstract: A braid-reinforced composite hollow fiber membrane is disclosed. The braid-reinforced composite hollow fiber membrane comprising a reinforcing material of a tubular braid and a polymer resinous thin film coated on the surface of the tubular braid is characterized in that: the tubular braid comprises multifilaments made of monofilaments having a fineness of 0.01 to 0.4 denier, and the peeling strength of the tubular braid and a polymer resinous thin film coated on the surface thereof is 1 to 10 MPa. In the composite hollow fiber membrane, the fineness of the mono filaments constituting the tubular braid of the reinforcing material is small, that is, 0.01 to 0.4 denier, thus the surface area of the tubular braid contacted with the polymer resinous thin film is increased.

Abstract: A hollow fiber membrane module with good ventilativity is disclosed, which is capable of reducing a time period for completely filling a water space of housing with water introduced through a water inlet by quickly replacing the air in the water space with the water thereby improving the efficiency of water flow.