Abstract: The present disclosure provides an article including an isoporous membrane disposed on a porous substrate. The iso-porous membrane includes a triblock copolymer or a pentablock copolymer. The isoporous membrane has a thickness and is isoporous throughout its thickness. A method of making an article is also provided, which does not require a solvent exchange process. The method includes depositing a composition on a porous substrate, thereby forming a fdm, and removing at least a portion of the solvent from the film, thereby forming an isoporous membrane having numerous pores. The composition contains a solvent and solids including a triblock copolymer or a pentablock copolymer. The article advantageously can be hydrophilic and provides sharp molecular weight cut-offs and high flux.

Abstract: A composite cooling film (100) comprises an antisoiling layer (160) secured to a first major surface of a reflective microporous layer (110). The reflective microporous layer (110) comprises a first fluoropolymer and is diffusely reflective of electromagnetic radiation over a majority of wavelengths in the range of 400 to 2500 nanometers. The antisoiling layer (160) has an outwardly facing antisoiling surface (162) opposite the micro-voided polymer film. An article (1100) comprising the composite cooling film (1112) secured to a substrate (1110) is also disclosed.

Abstract: A fibrous web comprising multiple fibers, wherein the fibrous web has a major web surface; wherein the fibers near the major web surface comprise an outer surface; wherein the outer surface of the fibers compromises a recrystallized skin layer; wherein the recrystallized skin layer has a plurality of textures; and wherein at least another part of the outer surface is smooth.

Abstract: An acoustic absorbing filler, the acoustic absorbing filler comprising agglomerates comprising a first phase comprising a plurality of porous particulates and a second phase comprising a binder; wherein the acoustic absorbing filler has a median sieved particle size of from 100 micrometer to 700 micrometers and a specific surface area of from 50 m2/g to 900 m2/g; wherein the acoustic absorbing filler has a normal incidence acoustic absorption of no less than 0.20 alpha at 400 Hz.

Abstract: An acoustic absorbing filler, the acoustic absorbing filler comprising a core particle comprising a polymer; an outer layer coated on the core particle, wherein the outer layer comprise microporous particulates; and wherein the acoustic absorbing filler has a median particle size of from 100 micrometer to 700 micrometers and a specific surface area of from 10 m2/g to 400 m2/g; wherein the acoustic absorbing filler has a normal incidence acoustic absorption of no less than 0.15 at 300 Hz when measured in a 20 mm packed bed.

Abstract: A porous membrane includes a triblock copolymer of the formula ABC. B is a hydrogenated vinyl aromatic block present in a range from 30 to 90 weight percent, based on the total weight of the copolymer and has a Tg of ?110° C. C is a rubbery block present in a range from 10 to 70 weight percent, based on the total weight of the copolymer and has a Tg?25° C. A is substantially incompatible with both the B and C blocks and is derived from ring-opening polymerization. B+C is present in a range from 70 to 95 weight percent, based on the total weight of the copolymer.

Abstract: A composite cooling film (100) comprises an ultraviolet-reflective multilayer optical film (120) and a reflective microporous layer (110) secured thereto. The ultraviolet-reflective multilayer optical film (120) hat is at least 50 percent reflective of ultraviolet radiation over a majority of the wavelength range of at least 340 but less than 400 nanometers. The reflective microporous layer (110) has a continuous phase comprising a nonfluorinated organic polymer and is diffusely reflective of solar radiation over a majority the wavelength range of 400 to 2500 nanometers, inclusive. The composite cooling film (100) has an average absorbance over the wavelength range 8-13 microns of at least 0.85. An article (1200) comprising the composite cooling film (100) adhered to a substrate (1210) is also disclosed.

Abstract: A composite cooling film (100) comprises an antisoiling layer (160) secured to a first major surface of a reflective microporous layer (110). The reflective microporous layer (110) comprises a first fluoropolymer and is diffusely reflective of electromagnetic radiation over a majority of wavelengths in the range of 400 to 2500 nanometers. The antisoiling layer (160) has an outwardly facing antisoiling surface (162) opposite the micro-voided polymer film. An article (1100) comprising the composite cooling film (1112) secured to a substrate (1110) is also disclosed.

Abstract: Provided are acoustic articles, and related methods, that include a porous layer and heterogeneous filler received in the porous layer. The heterogeneous filler can include clay, diatomaceous earth, graphite, glass bubbles, polymeric filler, non-layered silicate, plant-based filler, or a combination thereof, and can have a median particle size of from 1 micrometer to 1000 micrometers and a specific surface area of from 0.1 m2/g to 800 m2/g. The acoustic article can have an overall flow resistance of from 100 MKS Rayls to 8000 MKS Rayls. The acoustic articles can serve as acoustic absorbers, vibration dampers, and/or acoustic and thermal insulators.

Abstract: A porous membrane, The porous membrane includes a triblock copolymer of the formula ABC, the porous membrane comprising a plurality of pores; wherein the A block has a Tg of 90 degrees Celsius or greater and is present in an amount ranging from 30% to 80% by weight, inclusive, of the total block copolymer; wherein the B block has a Tg of 25 degrees Celsius or less and is present in an amount ranging from 10% to 40% by weight, inclusive, of the total block copolymer and wherein the C block is a water miscible hydrogen-bonding block immiscible with each of the A block and the B block; wherein the porous membrane comprising a first major surface and an opposed second major surface, wherein the first major surface is a nanostructured surface.

Abstract: The present disclosure provides a porous membrane made of pentablock copolymer. The porous membrane includes an ABCBA block copolymer and has a number of pores. The A block is immiscible with each of the B block and the C block, the B block has a glass transition temperature (Tg) of 90 degrees Celsius or greater, and the C block has a Tg of 25 degrees Celsius or less. The A block comprises a poly(alkylene oxide), a substituted epoxide, a polylactam, or a substituted carbonate; B block comprises a vinyl aromatic monomer or a polyalkylmethacrylate and C block comprises a polyacrylate, a polysiloxane or a polyisoprene. A method of making a porous membrane is also provided. The method includes forming a film or a hollow fiber from a solution including a solvent and solids containing an ABCBA block copolymer. The method further includes removing at least a portion of the solvent from the film or the hollow fiber and contacting the film or the hollow fiber with a nonsolvent.

Abstract: An isoporous membrane includes a multiblock copolymer film. The multiblock copolymer is crosslinked, and the film has a toughness of at least 50 kJ/m3 as a free-standing film when wet, as measured by integrating the area under a stress-strain curve for the film. Methods of forming isoporous membranes are also included.

Abstract: A porous membrane includes a triblock copolymer of the formula ABC. B is a hydrogenated vinyl aromatic block present in a range from 30 to 90 weight percent, based on the total weight of the copolymer and has a Tg of ?110° C. C is a rubbery block present in a range from 10 to 70 weight percent, based on the total weight of the copolymer and has a Tg?25° C. A is substantially incompatible with both the B and C blocks and is derived from ring-opening polymerization. B+C is present in a range from 70 to 95 weight percent, based on the total weight of the copolymer.

Abstract: Described is a triblock copolymer of the formula ABC wherein B is a hydrogenated vinyl aromatic block having a Tg of ?110° C. and comprising 30-90 wt. % of the copolymer; C is a rubbery block having a Tg?25° C. and comprising 10-70 wt. % of the copolymer; and A is an block derived from ring-opening polymerization, substantially incompatible with both B and C blocks.

Abstract: Asymmetric articles are described including a porous substrate with two opposing major surfaces and a porous structure extending between the surfaces, and a polymeric coating on one of the major surfaces and extending into the porous structure to a depth of the porous structure. Methods for making an asymmetric composite article are also provided, including providing a porous substrate, treating the porous substrate with a plasma treatment or a corona treatment from one major surface to a depth of the porous structure between the two major surfaces. The method further includes applying a coating solution to the treated porous substrate and drying the coating solution to form a composite asymmetric composite article having a polymeric coating on one major surface and extending into the porous structure to the depth of the treated porous structure.

Abstract: Novel pentablock polymers of the formula ABCBA are provided wherein C is a glassy aromatic block having a Tg of >70° C.; B is a rubber block having a Tg<25° C.; and A is a block incompatible with the B and C blocks and derived from ring-opening polymerization of cyclic monomers.

Abstract: The present disclosure provides a porous membrane made of pentablock copolymer. The porous membrane includes an ABCBA block copolymer and has a number of pores. The A block is immiscible with each of the B block and the C block, the B block has a glass transition temperature (Tg) of 90 degrees Celsius or greater, and the C block has a Tg of 25 degrees Celsius or less. The A block comprises a poly(alkylene oxide), a substituted epoxide, a polylactam, or a substituted carbonate; B block comprises a vinyl aromatic monomer or a polyalkylmethacrylate and C block comprises a polyacrylate, a polysiloxane or a polyisoprene. A method of making a porous membrane is also provided. The method includes forming a film or a hollow fiber from a solution including a solvent and solids containing an ABCBA block copolymer. The method further includes removing at least a portion of the solvent from the film or the hollow fiber and contacting the film or the hollow fiber with a nonsolvent.

Abstract: Described is a triblock copolymer of the formula ABC wherein B is a hydrogenated vinyl aromatic block having a Tg of ?110° C. and comprising 30-90 wt. % of the copolymer; C is a rubbery block having a Tg?25° C. and comprising 10-70 wt. % of the copolymer; and A is an block derived from ring-opening polymerization, substantially incompatible with both B and C blocks.

Abstract: Novel pentablock polymers of the formula ABCBA are provided wherein C is a glassy aromatic block having a Tg of >70° C.; B is a rubber block having a Tg<25° C.; and A is a block incompatible with the B and C blocks and derived from ring-opening polymerization of cyclic monomers.

Abstract: Articles are described including a first microfiltration membrane layer having a first major surface and a second major surface disposed opposite the first major surface, and a first silica layer directly attached to the first major surface of the first microfiltration membrane layer. The first silica layer includes a polymeric binder and acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network. A method of making an article is also described, including providing a first microfiltration membrane layer having a first major surface and a second major surface disposed opposite the first major surface, and forming a first silica layer on the first major surface.