Abstract:
Porous cross-linked polyimide-urea networks are provided. The networks comprise a subunit comprising two anhydride end-capped polyamic acid oligomers in direct connection via a urea linkage. The oligomers (a) each comprise a repeating unit of a dianhydride and a diamine and a terminal anhydride group and (b) are formulated with 2 to 15 of the repeating units. The subunit was formed by reaction of the diamine and a diisocyanate to form a diamine-urea linkage-diamine group, followed by reaction of the diamine-urea linkage-diamine group with the dianhydride and the diamine to form the subunit. The subunit has been cross-linked via a cross-linking agent, comprising three or more amine groups, at a balanced stoichiometry of the amine groups to the terminal anhydride groups. The subunit has been chemically imidized to yield the porous cross-linked polyimide-urea network. Also provided are wet gels, aerogels, and thin films comprising the networks, and methods of making the networks.
Abstract:
To provide a pneumatic tire by which rolling resistance is reduced while cracking resistance in side wall portions is maintained. A foam rubber layer 6 extending in a tire radial direction is disposed in at least a portion of the side wall portion 3. Heat conductivity at 23° C. of the foam rubber layer 6 is from 0.05 to 0.20 W/mK, a tan δ at 60° C. is not more than 0.17, and an expansion ratio Q is from 50 to 160%.
Abstract:
An ethylene-propylene-diene rubber foamed material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber. The ethylene-propylene-diene rubber foamed material has a 50% compressive load value of 0.1 to 2.0 N/cm2 and the content ratio of a sulfur atom calculated based on the measurement result of a fluorescent X-ray measurement, based on mass, is 1000 ppm or less.
Abstract:
The purpose of the present invention is to provide a gasket material that is capable of preventing corrosion caused by sulfur element, can be used as a seal part for a product that is easily damaged by corrosion, such as an electronic part, and is capable of forming a tight seal under low surface pressure with a material having low rigidity and inadequate reliability such as to have a blowhole, and that can prevent reduction in bolt axial load without producing plastic flow (setting) under pressure. The purpose is achieved by a gasket material in which a foamed rubber layer having a closed cell structure is formed, via an adhesive layer, on at least one side of a metal plate, wherein the foamed rubber layer comprises a carboxyl group-modified nitrile rubber, the expansion ratio of the foamed rubber layer is 2.0 to 3.0, and the foamed rubber layer is crosslinked with an epoxy compound.
Abstract:
The present invention relates to a foam rubber material for a weather strip comprising a crosslinked rubber sponge material having a load value ratio satisfying the following relationship: load value ratio (%)=B/A×100≦50, wherein A is a load value at 50% compression in the course of compression deformation, and B is a load value at 50% compression in the course of returning from the deformation.
Abstract translation:本发明涉及一种用于耐候条的泡沫橡胶材料,其包含负载值比满足以下关系的交联橡胶海绵材料:负载值比(%)= B / A×100≦̸ 50,其中A是负载值 在压缩变形过程中压缩50%,B是在变形过程中压缩50%时的载荷值。
Abstract:
The present invention provides a method for producing a long strip-shaped porous thermosetting resin sheet free of defective portions leading to breakage. The present invention is a method for producing a porous thermosetting resin sheet, the method including the steps of cutting a hollow-cylindrical or solid-cylindrical thermosetting resin block containing a porogen into a sheet of a thermosetting resin with a predetermined thickness by bringing a cutting blade into contact with the thermosetting resin block while rotating the thermosetting resin block about a hollow cylinder axis or a solid cylinder axis; and making the resultant thermosetting resin sheet porous by removing the porogen from the thermosetting resin sheet. The cutting blade is reciprocated approximately parallel to a direction of the rotational axis of the thermosetting resin block while the cutting is being performed.
Abstract:
Crosslinked organic polymeric porous particles have a crosslinked organic solid phase and discrete pores dispersed within the crosslinked solid phase which pores are isolated from each other. These porous particles are prepared using one or more water-in-oil emulsions containing a polyfunctional reactive compound, a reagent that causes crosslinking, optionally an ethylenically unsaturated polymerizable monomer, and optionally an organic solvent, and can include various marker materials.
Abstract:
An ethylene-propylene-diene rubber foamed material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber. A rate of change of an 80% compressive load value CL2 after being heated at 150° C. for 10 days to an 80% compressive load value CL1 before being heated is −50% or more and 50% or less and the 80% compressive load value CL1 before being heated is 0.5 N/cm2 or more and 10 N/cm2 or less.
Abstract translation:通过使含有乙烯 - 丙烯 - 二烯橡胶的橡胶组合物发泡,得到乙烯 - 丙烯 - 二烯橡胶发泡体。 在加热之前,在150℃加热10天后80%压缩载荷值CL1的80%压缩载荷值CL2的变化率为-50%以上且50%以下,80%压缩 加热前的负载值CL1为0.5N / cm 2以上且10N / cm 2以下。
Abstract:
To provide a urethane foam molded product having high thermal conductivity and electric insulation and a method for producing the same. A urethane foam molded product includes a base material made of a polyurethane foam and composite particles that are blended in the base material and oriented in a mutually connected state, in which each of the composite particles includes a thermally conductive particle made of a non-magnetic body, and a magnetic particle and an insulating inorganic particle that are adhered to the surface of the thermally conductive particle through a binder. A powder of the composite particles can be produced by stirring a powder raw material containing a powder of the thermally conductive particle, a powder of the magnetic particle, a powder of the insulating inorganic particle, and the binder using a stirring granulator.
Abstract:
The invention relates to foam derived from natural oils, e.g. plant and animal oils. The oils are functionalized to allow for the preparation of foams with desired chemical and physical properties, such as density and robustness. The foam may contain a triglyceride having a first set of functional groups, and a second compound or chain extender (e.g., a second triglyceride, a fatty acid or polyethylene glycol) having a second set of functional groups capable of reacting with the first set of functional groups to form a covalent bond.