A separator for an electrochemical device including a porous substrate made of a porous polymer material. The separator substrate has a small thickness, excellent resistance characteristics, ion conductivity, and high mechanical strength. When the separator is applied to a battery, it is possible to improve the output characteristics of the battery.

A separator for an electrochemical device including a porous substrate made of a porous polymer material. The separator substrate has a small thickness, excellent resistance characteristics, ion conductivity, and high mechanical strength. When the separator is applied to a battery, it is possible to improve the output characteristics of the battery.

An object is to provide a porous film which has excellent removal performance of viruses and the like and a long lifetime, a virus removal method which uses the porous film as a filter, a method for producing a virus-free product which uses the porous film as a filter and a device which includes the porous film as a filter. In a porous film including a structure of spherical pores communicating with each other, an interconnected pore is an opening of the spherical pores communicating with each other, and the pore diameter of the interconnected pore is set to 10 nm or more and 35 nm or less, and the number of spherical pores which are present between one surface of the porous film and the other surface thereof and are 50 nm or more and 200 nm or less is set to 200 or more and 1000 or less.

An object is to provide a porous film which has excellent removal performance of viruses and the like and a long lifetime, a virus removal method which uses the porous film as a filter, a method for producing a virus-free product which uses the porous film as a filter and a device which includes the porous film as a filter. In a porous film including a structure of spherical pores communicating with each other, an interconnected pore is an opening of the spherical pores communicating with each other, and the pore diameter of the interconnected pore is set to 10 nm or more and 35 nm or less, and the number of spherical pores which are present between one surface of the porous film and the other surface thereof and are 50 nm or more and 200 nm or less is set to 200 or more and 1000 or less.

A substrate for a composite membrane includes a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 m to 12 m; and, when a mixed solution of ethanol and water (volume ratio 1/2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle 1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle 2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle ((12)/1100) is 10 to 50%.

A hierarchical porous polymeric material and its preparation method in the field of porous polymeric materials provided. The preparation method comprises: (1) mixing hydrophobic silica particles, an initiator, a polymerizable monomer, a crosslinking agent, a co-crosslinking agent and a pore-forming agent together, uniformly stirring to obtain a reaction mixture; (2) adding water into the reaction mixture and stirring until a gel emulsion is formed; and (3) carrying out staged thermal polymerization on the gel emulsion to obtain the hierarchical porous polymeric material. The present application can effectively regulate and control the contents and sizes of pores and throats, and obtain a material with hierarchical micro-porous structures. The good heat transfer and zero explosion in the polymerization process enable high product qualification rate. The wet material has rich pores, small resistance in mass transfer process and fast drying rate. Meanwhile, the obtained material has excellent machinability and static load resistance.

A composition comprising a fiber component having a melt/softening temperature and a matrix material for mixing with the fiber component, wherein the composition experiences a vertical rise of at least about 0.5 mm in the absence of any blowing agent when exposed to an elevated temperature of at least about 70 C.

A composition comprising a fiber component having a melt/softening temperature and a matrix material for mixing with the fiber component, wherein the composition experiences a vertical rise of at least about 0.5 mm in the absence of any blowing agent when exposed to an elevated temperature of at least about 70 C.

Compositions for forming porous materials and three-dimensional objects, including fibers, films and coatings made from the materials are provided. Also provided are methods for forming the porous objects from the compositions. The compositions include a solvent, a polymer binder that is soluble in the solvent, and solid particles that are insoluble in the solvent. The solid particles include water-soluble salt particles that can be selectively dissolved from objects made from the compositions to render the resulting structures porous.

Compositions for forming porous materials and three-dimensional objects, including fibers, films and coatings made from the materials are provided. Also provided are methods for forming the porous objects from the compositions. The compositions include a solvent, a polymer binder that is soluble in the solvent, and solid particles that are insoluble in the solvent. The solid particles include water-soluble salt particles that can be selectively dissolved from objects made from the compositions to render the resulting structures porous.