Objects produced by conventional three-dimensional printing methods are often incompletely consolidated and are not easily repaired. Printing compositions to address this issue can include a solidifiable matrix and a microwave absorber dispersed in the solidifiable matrix. The microwave absorber can be a plurality of carbon nanostructures containing a plurality of carbon nanotubes that are branched, crosslinked, and share common walls with one another. Methods for processing a three-dimensional printed object can include: providing a three-dimensional printed object formed from a printing composition containing a solidifiable matrix and a microwave absorber dispersed in the solidifiable matrix, and applying a focused input of microwave radiation to the printed object at one or more locations. Applying the microwave radiation heats the microwave absorber at the one or more locations and promotes consolidation of the printing composition within the printed object.

A method for making a conductive pre-impregnated composite sheet includes the steps of joining a nanomaterial composite sheet, a fiber-reinforcing sheet and a resin system to form a combined sheet, heating the combined sheet, compacting the combined sheet, and cooling the combined sheet to form conductive pre-impregnated composite sheet including the fiber-reinforcing sheet, and the nanomaterial composite sheet coupled to the fiber-reinforcing sheet, wherein the fiber-reinforcing sheet and the nanomaterial composite sheet are embedded in the resin system.

The present invention is a unique process of manufacturing rigid members with precise “shape keeping” properties and with reflective properties pertaining to radio frequency energy, so that air, land, sea and space devices or vehicles may be constructed including parabolic reflectors formed without discrete permanent layering. Rather, such parabolic reflectors or similarly, vehicles, may be formed by homogeneous construction where discrete layering is absent, and where energy reflectivity or scattering characteristics are embedded within the homogeneous mixture of carbon nanotubes and associated graphite powders and epoxy, resins and hardeners. The mixture of carbon graphite nanofiber and carbon nanotubes generates higher electrode conductivity and magnetized attraction through molecular polarization. In effect, the rigid members may be tuned based on the application. The combination of these materials creates a unique matrix that is then set in a memory form at a specific temperature, and then applied to various materials through a series of multiple layers, resulting in unparalleled strength and durability.

An article includes a body and at least one 3D-printable conductive composite segment in mechanical communication with the body. The body includes a first material and the at least one conductive composite segment includes a matrix material, a plurality of carbon nanotubes, and conductive additives. The conductive additives include a plurality of metallic particulates, a plurality of graphitic particles or a combination thereof.

A method of manufacturing a wind turbine blade with integrated lightning strike protection is provided. The method includes forming a plurality of fiber reinforced plies having carbonized textile-grade PAN fibers. The fiber reinforced plies are then stacked on a surface of a mold, wetted with a resin, and cured to form at least part of a wind turbine blade. Because the textile-grade PAN fibers are electrically conductive, the resultant structure provides both electrical conductivity and structural integrity. Laboratory testing of carbon fiber structures against simulated lightning strikes demonstrated high resilience due to their high electrical conductivity both in-plane and in through-thickness directions, with no significant damages, e.g., fiber breakage, resin evaporation, or delamination. High-temperature epoxy helped to improve the performance of the CFRP against the lightning strikes.

A conductive polymer composite includes: a thermoplastic polymer; a plurality of carbon nanotubes; and a plurality of metallic particulates in an amount ranging from about 0.5% to about 80% by weight relative to the total weight of the conductive polymer composite.

Aspects of the present disclosure generally describe polyarylether ketones and methods of use. In some aspects, a composition includes one or more polymers of formula (IV):

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Fibers, prepreg materials, compositions, composite articles, and methods of producing composite articles are disclosed herein. A fiber may include at least one polymeric fiber and a plurality of carbon nanotubes. The at least one polymeric fiber extends in a lengthwise direction. The at least one polymeric fiber is a nanofiber.

Disclosed is a filter housing which is a molded body of a fluororesin composition in which carbon nanotubes are dispersed in a fluororesin, wherein the fluororesin composition comprises 0.01 to 2.0% by mass of the carbon nanotubes.

A nanofiber yarn placement system includes a yarn dispenser assembly, and a placement assembly. The placement assembly includes a compliant flange, and a guide connected to the compliant flange. The guide defining a channel. The channel includes at least one internal surface and at least one corner defined by the at least one internal surface.