There are provided microfibers that generate less formaldehyde and acetaldehyde and have a favorable fiber openness, a fiber molded body using the microfibers, and a method for producing the same. The method for producing a fiber molded body of the present invention is a method for producing a fiber molded body comprising molding of a fiber mixture, wherein the fiber mixture comprises microfibers, wherein the content of the microfibers in the fiber mixture is 5 mass % or more, wherein, in the microfibers, an amount of an oil adhered is 0.1 to 1 mass %, a total amount of ethylene oxide units and propylene oxide units generated is 0.01 to 0.5 mass %, and a single fiber fineness is 0.01 to 0.5 dtex.

There are provided microfibers that generate less formaldehyde and acetaldehyde and have a favorable fiber openness, a fiber molded body using the microfibers, and a method for producing the same. The method for producing a fiber molded body of the present invention is a method for producing a fiber molded body comprising molding of a fiber mixture, wherein the fiber mixture comprises microfibers, wherein the content of the microfibers in the fiber mixture is 5 mass % or more, wherein, in the microfibers, an amount of an oil adhered is 0.1 to 1 mass %, a total amount of ethylene oxide units and propylene oxide units generated is 0.01 to 0.5 mass %, and a single fiber fineness is 0.01 to 0.5 dtex.

There is provided a fiber molded body for sound absorbing/sound insulation materials, which is lightweight and has excellent sound absorption performance. The fiber molded body for sound absorbing/sound insulation materials of the present invention is a fiber molded body for sound absorbing/sound insulation materials comprising uncolored ultrafine chemical fibers and colored fibers or reclaimed fibers, wherein the single fiber fineness of the ultrafine chemical fibers is 0.01 to 0.5 dtex, the content of the ultrafine chemical fibers is 5 to 70 mass % and the content of the colored fibers or the reclaimed fibers is 20 to 60 mass %, in the fiber molded body for sound absorbing/sound insulation materials.

There is provided a fiber molded body for sound absorbing/sound insulation materials, which is lightweight and has excellent sound absorption performance. The fiber molded body for sound absorbing/sound insulation materials of the present invention is a fiber molded body for sound absorbing/sound insulation materials comprising uncolored ultrafine chemical fibers and colored fibers or reclaimed fibers, wherein the single fiber fineness of the ultrafine chemical fibers is 0.01 to 0.5 dtex, the content of the ultrafine chemical fibers is 5 to 70 mass % and the content of the colored fibers or the reclaimed fibers is 20 to 60 mass %, in the fiber molded body for sound absorbing/sound insulation materials.

A manufacturing method for a carbon fiber includes the following steps. A first monomer and a second monomer are dissolved in a first solvent, and a polymerization reaction is performed to form a copolymerized polymer, in which the first monomer includes acrylonitrile, the second monomer has an unsaturated bond, the first solvent includes dimethyl sulfoxide, and based on 100 wt % of the first solvent, a content of the dimethyl sulfoxide is between 99.9 wt % and 100 wt %. A spinning step is performed on the copolymerized polymer.

Provided is a carbon fiber with a strand modulus of elasticity from 240 to 300 GPa, an elongation of 2.65% or more, and a strain energy density of 95 J/mm.sup.3 or more, which can improve the impact resistance of carbon fiber composite materials.

Provided is a carbon fiber with a strand modulus of elasticity from 240 to 300 GPa, an elongation of 2.65% or more, and a strain energy density of 95 J/mm.sup.3 or more, which can improve the impact resistance of carbon fiber composite materials.

Ceramic matrix composite (CMC) materials are a desired solution for lightweight and high temperature applications. CMC materials can be reinforced with polymer-derived ceramic (PDC) fibers, which advantageously possess intrinsic thermal stability and high mechanical strength. Carbon-rich SiOC and SiOCN fibers were synthesized via hand-drawing and electrospinning polymer pyrolysis of a hybrid precursor materials with the aid of a spinning reagent. The prepared fibers are crosslinked and pyrolyzed for polymer-to-ceramic conversion.

The present invention provides an anisotropic, thermal conductive, electromagnetic interference (EMI) shielding composite including a plurality of aligned polymer nanofibers to form a polymer mat or scaffold having a first and second planes of orientation of the polymer nanofibers. The first plane of orientation of the polymer nanofibers has a thermal conductivity substantially the same as or similar to that of the second plane, and the thermal conductivity of the first or second plane of orientation of the polymer nanofibers is at least 2-fold of that of a third plane of orientation of the polymer nanofibers which is about 90 degrees out of the first and second planes of orientation of the polymer nanofibers, respectively, while the electrical resistance of each of the first and second planes is at least 3 orders lower than that of the third plane. A method for preparing the present composite is also provided.

The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.