A polymer body includes a first thermoplastic polymer, and a second thermoplastic polymer. The first thermoplastic polymer and the second thermoplastic polymer form a continuous solid structure. The first thermoplastic polymer forms an external supporting structure that at least partially envelops the second thermoplastic polymer. A first flow temperature of the first thermoplastic polymer is at least 10° C. higher than a second flow temperature of the second thermoplastic polymer. The first thermoplastic polymer may be removable by exposure to a selective solvent.

A polymer body includes a first thermoplastic polymer, and a second thermoplastic polymer. The first thermoplastic polymer and the second thermoplastic polymer form a continuous solid structure. The first thermoplastic polymer forms an external supporting structure that at least partially envelops the second thermoplastic polymer. A first flow temperature of the first thermoplastic polymer is at least 10° C. higher than a second flow temperature of the second thermoplastic polymer. The first thermoplastic polymer may be removable by exposure to a selective solvent.

A composite fiber having a core sheath-structure that includes a core portion having an electrically conductive material, and a sheath portion having a ceramic component covering the core portion. The composite fiber is constructed such that, when the core portion is connected to a ground, the sheath portion exhibits one of a positive surface potential or a negative surface potential over an entire surface of the sheath portion.

A polymer body includes a first thermoplastic polymer, and a second thermoplastic polymer. The first thermoplastic polymer and the second thermoplastic polymer form a continuous solid structure. The first thermoplastic polymer forms an external supporting structure that at least partially envelops the second thermoplastic polymer. A first flow temperature of the first thermoplastic polymer is at least 10° C. higher than a second flow temperature of the second thermoplastic polymer. The first thermoplastic polymer may be removable by exposure to a selective solvent.

A polymer body includes a first thermoplastic polymer, and a second thermoplastic polymer. The first thermoplastic polymer and the second thermoplastic polymer form a continuous solid structure. The first thermoplastic polymer forms an external supporting structure that at least partially envelops the second thermoplastic polymer. A first flow temperature of the first thermoplastic polymer is at least 10° C. higher than a second flow temperature of the second thermoplastic polymer. The first thermoplastic polymer may be removable by exposure to a selective solvent.

A thermoplastic core-sheath fiber comprises: a polymer fiber core having a coextensive sheath layer disposed thereon, and an electrostatic charge enhancing additive. The sheath layer may comprise poly(4-methyl-1-pentene) and the fiber core and the sheath layer have different compositions. At least one of the fiber core or the sheath layer comprises an electret charge. A nonwoven fibrous web comprising the core-sheath fibers and a respirator including the nonwoven fibrous web are also disclosed.

A thermoplastic core-sheath fiber comprises: a polymer fiber core having a coextensive sheath layer disposed thereon, and an electrostatic charge enhancing additive. The sheath layer may comprise poly(4-methyl-1-pentene) and the fiber core and the sheath layer have different compositions. At least one of the fiber core or the sheath layer comprises an electret charge. A nonwoven fibrous web comprising the core-sheath fibers and a respirator including the nonwoven fibrous web are also disclosed.

A coated filament for use in additive manufacturing includes a base polymer layer formed of a base polymer material and a coating polymer layer formed of a coating polymer material. At least the coating polymer material is susceptible to dielectric heating in response to electromagnetic radiation, thereby promoting fusion between adjacent beads of coated filament that are deposited during the additive manufacturing process. Specifically, when electromagnetic radiation is applied to an interface area between two adjacent beads of the coated filament, the polymer coating layer melts to diffuse across the interface area, thereby preventing formation of voids. The base polymer material and the coating polymer material of the coated filament also may have similar melting points and compatible solubility parameters to further promote fusion between beads.

The invention relates to a spider-silk-like polymer fiber in the technical field of chemical bionics, a preparation method therefor and the use thereof. The spider-silk-like polymer fiber comprises a matrix polymer and a particle additive dispersed therein, wherein the particles have an average particle size of 0.1-1000 microns, and the polymer fiber has a spider-silk-like microstructure comprising a fiber body and spaced spindle knot structural units on the fiber body, wherein the spindle knot structural units comprise the particles, and the radial height of the spindle knot structural units is greater than the diameter of the fiber body. The preparation method of the polymer fiber of the invention does not require greatly modifying the existing spinning processes, and the equipment does not need to be changed, the process is simple, and the cost is low. The obtained spider-silk-like polymer fiber can realize the directional movement of water droplets on the surface of the fiber, thereby having a water gathering function and can be used for preparing water gathering materials.

The invention relates to a spider-silk-like polymer fiber in the technical field of chemical bionics, a preparation method therefor and the use thereof. The spider-silk-like polymer fiber comprises a matrix polymer and a particle additive dispersed therein, wherein the particles have an average particle size of 0.1-1000 microns, and the polymer fiber has a spider-silk-like microstructure comprising a fiber body and spaced spindle knot structural units on the fiber body, wherein the spindle knot structural units comprise the particles, and the radial height of the spindle knot structural units is greater than the diameter of the fiber body. The preparation method of the polymer fiber of the invention does not require greatly modifying the existing spinning processes, and the equipment does not need to be changed, the process is simple, and the cost is low. The obtained spider-silk-like polymer fiber can realize the directional movement of water droplets on the surface of the fiber, thereby having a water gathering function and can be used for preparing water gathering materials.