Conductive polymer composite, filament and 3D-printed component

Abstract

Polymer composite with an electrical volume conductivity between 10 -7 S / cm and 1 S / cm, consisting of or containing • a preferably thermoplastic polymer, • Carbon fibers and • Carbon nanostructures.

Description

Technical field

[0001] The present disclosure relates to a conductive polymer composite and in particular to a filament with such a polymer composite and to a component made therefrom.

[0002] Polymer composites are composite materials containing a polymer component. They are used, for example, in additive manufacturing, also known as 3D printing, and have become increasingly popular in this field in recent years. Polymer composites are often in the form of a wire, called a filament.

[0003] Polymer composites comprise at least one additional material component besides the polymer component and combine the favorable material properties of these components. This additional component allows for material properties that the polymer component alone does not possess, or at least not to the desired degree. As a result, functional properties can be integrated into additive manufacturing that would otherwise only be achieved after additive manufacturing through complex post-processing of the additively manufactured object or the assembly of supplementary components.

[0004] For example, there is a need for electrically conductive polymer composites. The ability to integrate conductive components into 3D-printed objects offers potential for embedded sensors and electronics applications. However, it has been observed that electrically conductive polymer composites often exhibit printability limitations, such as unsatisfactory dimensional accuracy. Furthermore, components manufactured with electrically conductive polymer composites frequently suffer from insufficient strength.

[0005] Against this backdrop, there is also great interest in developing improved materials for additive manufacturing. These improved materials should exhibit electrical conductivity sufficient to enable the additively manufactured object to be used in electronics and / or sensor technology. At the same time, the improved materials should guarantee at least adequate geometric accuracy and component strength with respect to the printed object. concepts

[0006] A fundamental improvement is offered by an embodiment of a polymer composite which contains or consists of a preferably thermoplastic polymer, carbon fibers and carbon nanostructures and has a bulk electrical conductivity between 10 -7exhibiting S / cm and 1 S / cm. In particular, in this embodiment, the polymer composite was free of carbon black particles. It has been shown that such a polymer composite enables 3D printing with sufficient geometric fidelity and sufficient component strength of a printed object, and that the printed object achieves an electrical conductivity in a range usable for applications in electronics and / or sensor technology.

[0007] This was made possible by the carbon components used, which enabled improved electrical conductivity. It was found that the carbon fibers, in combination with the carbon nanostructures, create an enhanced percolation network, as the carbon nanostructures act as bridges between the individual carbon fibers, thus promoting the formation of a consistently conductive structure within the polymer. This allows the overall proportion of carbon components to be reduced relative to the proportion of the polymer component in order to achieve the desired electrical conductivity. As a result, the properties of the polymer component are more pronounced, positively impacting printability and component strength. The higher proportion of the polymer component improves the geometric accuracy during printing and the strength of the printed object.

[0008] A fundamental improvement is also offered by an embodiment of a polymer composite which contains or consists of a preferably thermoplastic polymer, carbon fibers and carbon black particles and has a bulk electrical conductivity between 10 -7 exhibits S / cm and 1 S / cm. In particular, in this embodiment, the polymer composite was free of carbon nanostructures. It was found that the effects described above in connection with the carbon nanostructures also occur when carbon black particles are used instead of the carbon nanostructures. Therefore, the advantages described above also apply to this polymer composite.

[0009] A further improvement is offered by an embodiment of a polymer composite which contains or consists of a preferably thermoplastic polymer, carbon fibers, carbon nanostructures and carbon black particles and has a bulk electrical conductivity between 10-7 This polymer composite exhibits values ​​of S / cm and 1 S / cm. It enables 3D printing with further improved geometric accuracy and component strength, while maintaining the same or comparable electrical conductivity as the polymer composites described above.

[0010] The improved performance is due to further enhanced electrical conductivity, achieved through the presence of carbon nanostructures and carbon black particles. It was observed that the combined presence of carbon nanostructures and carbon black particles further strengthens bridging between adjacent carbon fibers, resulting in even greater electrical conductivity. This allows the overall proportion of carbon components to be further reduced relative to the polymer component, achieving the desired electrical conductivity. Consequently, the properties of the polymer component become more pronounced, leading to improved geometric accuracy in 3D printing and enhanced component strength of the printed object.

[0011] In particular, the carbon fibers have an average fiber length between 20 µm and 2 mm, more specifically between 20 µm and 400 µm, more specifically between 40 µm and 150 µm, and preferably between 60 µm and 100 µm. For example, the average fiber length is 60 µm, 65 µm, 70 µm, 75 µm, 80 µm, 85 µm, 90 µm, 95 µm, or 100 µm. It has been found that such an average fiber length of the carbon fibers improves electrical conductivity and also has a positive effect on the printability of the polymer composite and the component strength of the printed object.

[0012] In particular, the carbon fibers have a diameter between 5 µm and 20 µm, especially between 5 µm and 15 µm, and preferably between 7 µm and 10 µm. For example, the diameter is 7 µm, 8 µm, 9 µm, or 10 µm. It has been found that such a diameter of the carbon fibers improves electrical conductivity and also has a positive effect on the printability of the polymer composite and the component strength of the printed object.

[0013] In particular, the carbon fibers have a proportion between 5% and 26%, especially between 7% and 23%, and preferably between 8% and 21%, based on 100 mass parts of the polymer and dry polymer composite. For example, the proportion of carbon fibers is 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or 21%, based on 100 mass parts of the polymer and dry polymer composite. Studies have shown that such a proportion of carbon fibers achieves the positive effects described above.

[0014] In particular, the carbon nanostructures have a proportion between 0.1% and 12%, especially between 0.5% and 10%, and preferably between 1% and 8%, based on 100 mass fractions of the polymer and dry polymer composite. For example, the proportion of carbon nanostructures is 1%, 2%, 3%, 4%, 5%, 6%, 7%, or 8%, based on 100 mass fractions of the polymer and dry polymer composite. Studies have shown that such a proportion of carbon nanostructures achieves the positive effects described above.

[0015] The positive effects were observed when the carbon nanostructures were formed as tubes, i.e., as nanotubes. The positive effects were also observed when, alternatively, the carbon nanostructures were formed as flakes, i.e., as nanoflakes. Likewise, the positive effects were observed with carbon nanostructures that were present in a mixture or blend containing or consisting of nanotubes and nanoflakes.

[0016] In this disclosure, the term "nanostructures" refers to structures with a structural size of less than 100 nm. The term "carbon nanostructures" refers to nanostructures that consist of or contain carbon, for example, those with a carbon content exceeding 97 wt%.

[0017] In this disclosure, the term "nanotubes" refers to elongated hollow bodies with a diameter of less than 100 nm, for example, having a diameter between 5 nm and 70 nm, and in particular between 10 nm and 50 nm. The term "carbon nanotubes," also referred to as CNTs, in this disclosure refers to nanotubes that consist of or contain carbon, for example, having a carbon content of 90 wt.% to 98 wt.%. For example, the carbon nanotubes are composed of honeycomb-like lattices of carbon atoms. For example, the carbon nanotubes have a diameter between 0.3 nm and 100 nm, in particular between 5 nm and 50 nm, preferably between 10 nm and 30 nm, for example, 10 nm, 15 nm, 20 nm, 25 nm, or 30 nm.

[0018] In this disclosure, the term "nanoflakes" refers to planar nanostructures. The term "carbon nanoflakes" refers to nanoflakes that consist of or contain carbon, for example, having a carbon content of 95 wt% to 99 wt%. For example, the carbon nanoflakes have a thickness of 1 nm to 10 nm. For example, the carbon nanoflakes have a lateral extent between 50 nm and 10 nm.

[0019] In this disclosure, the term "soot" refers to a solid substance consisting of or containing carbon. For example, soot has a carbon content between 80% and 99.5% by weight. The term "soot particles" refers to soot particles.

[0020] In particular, the soot particles have an average particle size between 10 nm and 100 nm, especially between 10 nm and 50 nm, preferably between 15 nm and 30 nm. For example, the average particle size is 10 nm, 15 nm, 20 nm, 25 nm or 30 nm.

[0021] Preferably, the soot particles are conductive soot particles, also known as conductive carbon black. This type of soot exhibits electrical conductivity, particularly higher conductivity compared to other types of soot, due to its small primary particles and highly branched aggregates.

[0022] In particular, the carbon black particles have a proportion between 0.1% and 13%, especially between 0.5% and 10%, preferably between 1% and 8%, based on 100 mass parts of the polymer and dry polymer composite. For example, the proportion of carbon black particles is 1%, 2%, 3%, 4%, 5%, 6%, 7%, or 8%, based on 100 mass parts of the polymer and dry polymer composite. Studies have shown that the positive effects described above are achieved with such a proportion of carbon black particles.

[0023] The polymer may comprise a single polymer or a mixture of polymers. For example, the polymer comprises at least one repeating unit selected from a group consisting of or containing acrylate units, carboxylic ester units, amide units, lactic acid units, benzimidazole units, carbonate ester units, ether units, sulfone units, aryl ketone units, aryl ether units, arylalkyl units, etherimide units, ethylene units, phenylene oxide units, propylene units, styrene units, vinyl halide units, and carbamate units. For example, the polymer is a copolymer with or consisting of two or more repeating units, such as a block copolymer with or consisting of two or more of the repeating units listed above.

[0024] For example, the polymer comprises at least one polymer consisting of a group containing polyacrylates, polybenzimidazoles (abbreviation "PBI"), polycarbonates (abbreviation "PC"), polyethersulfones, polyaryletherketones (abbreviation "PEK"), polyethylenes (abbreviation "PE"), polyphenylene oxides (abbreviation "PPO"), polypropylenes (abbreviation "PP"), polystyrenes (abbreviation "PS"), polyesters, polyurethanes (abbreviation "PUR"), polyamides (abbreviation "PA"), polyvinylidene fluorides (abbreviation "PVDF"), polyvinyl chlorides (abbreviation "PVC"), polyetheretherketones (abbreviation "PEEK"), polydicyclopentadienes (abbreviation "PDCPD"), poly(ethylene-co-vinyl acetates), polyetherimides (abbreviation "PEI"), polypropylenes (abbreviation "PP"), poly(vinylidene fluoride-cohexafluoropropylene), Poly(styrene-isoprene-styrene), Acrylonitrile butadiene styrene (abbreviation "ABS"), Poly(styrene-ethylene-butylene styrene) (abbreviation "SEBS"), Polyethylene terephthalate (abbreviation "PET"), Polylactic acid (abbreviation "PLA"),Polydiketoenamine (abbreviation "PDK"), poly(hydroxybutyrate-co-hydroxyhexanoate) (abbreviation "PHBH") and polycaprolactone (abbreviation "PCL") or consisting thereof, is selected.

[0025] The polymer may also be selected from a group consisting of or including polyacrylates and an acrylate copolymer, such as block copolymers of acrylates. The acrylate copolymers may comprise at least one acrylate monomer and optionally one or more additional monomers, such as any of the monomers mentioned above. Such polymers may be designed to exhibit a desired degree of flexibility. Alternatively, the polymer may be a polyester, such as a polycaprolactone.

[0026] The polymer can be present in the proposed polymer composites of the present disclosure in any suitable amount to ensure that the polymer composite functions in a three-dimensional printing process. Examples of suitable amounts include a range between 40% and 99%, in particular between 75% and 95%, and preferably between 79% and 93%, based on the total dry mass of the composite.

[0027] The proposed polymer composite can include any other components in any desired quantities, such as carrier fluids, plasticizers, dispersants, surfactants and dyes.

[0028] The proposed polymer composite can be in any suitable form. The polymer composite can be liquid or solid at room temperature. For example, at room temperature, the polymer composite is a conductive granule or a conductive powder.

[0029] For example, the proposed polymer composite is a conductive resin. The resin can be a liquid resin at room temperature or a material that needs to be heated to flow like a resin.

[0030] For example, the proposed polymer composite is a conductive paste. The paste can be a paste at room temperature or a material that needs to be heated to flow like a paste.

[0031] For example, the proposed polymer composite is in the form of a dry composite with less than 5 wt% liquid carrier, in particular less than 3 wt%, 2 wt%, or 1 wt% liquid carrier, based on the total weight of the dry polymer composite. The dry composite can be formulated using a solvent, which is then removed by any suitable method, such as heating, vacuum, and / or other liquid removal techniques. Alternatively, the composite can be produced without a carrier liquid using pure processing techniques.

[0032] One embodiment of the present disclosure relates to a granulate for a 3D printer, consisting of or containing the polymer composite described above.

[0033] Another embodiment of the present disclosure relates to a paste for a 3D printer, consisting of or containing the polymer composite described above.

[0034] Another embodiment of the present disclosure relates to a filament consisting of or containing the polymer composite described above. In particular, the filament is designed to be used as a printing wire in a 3D printer.

[0035] Another embodiment of the present disclosure relates to a component comprising at least one polymer composite of the type described above, in particular manufactured therefrom. For example, the component is manufactured using the 3D printing process described above. The component may be an electronic component or a sensor component.

[0036] Another embodiment of the present disclosure relates to the use of the polymer composite described above for the manufacture of electrically conductive components, in particular electronic components and sensor components. Examples

[0037] The concepts outlined above will be explained below using several exemplary polymer composites.

[0038] The exemplary polymer composites were each produced by melt-mixing a polymer base (e.g., polyamide) with carbon fibers and carbon nanostructures and / or carbon black particles on a Leistritz twin-screw extruder at speeds between 10 and 300 revolutions per minute and extruding it into a filament. The melt-mixing and extrusion were performed in a single process using the twin-screw extruder. In principle, two or more processes can also be carried out, in which, for example, the melt-mixing takes place first, followed by cooling and comminution of the resulting composite (e.g., by shredding), and then extrusion into a filament using a die, such as an extruder.

[0039] The polymer base, carbon fibers, nanostructures, and carbon black particles were each provided as granules and fed into the twin-screw extruder in this form. The carbon fibers had an average fiber length of approximately 80 µm and a diameter of approximately 8 µm. The carbon nanostructures were carbon nanotubes with a diameter between 10 nm and 50 nm. The carbon black particles had an average particle size between 10 nm and 50 nm and belonged to the group of conductive carbon black. The resulting filament was round in cross-section, preferably circular, and had a diameter of approximately 1.75 mm.

[0040] In order to assess the desired properties, the electrical volume conductivity σ, the tensile strength Rm and the printability were determined.

[0041] The electrical volume conductivity σ was determined using the formula σ=L / (R⋅A) calculated, whereby L is the length of a printed segment of the produced filament, R is the measured resistance of the printed length section and A. Define the cross-sectional area of ​​the printed linear segment. The printed linear segment was produced by a 3D printer with a nozzle diameter of 0.4 mm. In cross-section, the printed linear segment had a width of approximately 2 mm and a height of approximately 1 mm. The length of the printed linear segment was approximately 1000 mm. The ends of the printed linear segment were connected to a preferably digital multimeter, and the resistance R was measured.

[0042] The tensile strength Rm was used as a measure of the mechanical strength of the component. The tensile strength Rm was determined in a tensile test according to ISO 527-1. A defined tensile specimen, printed with the generated filament, was used. The tensile specimen had an elongated contour based on type 1A according to ISO 527-1. The contour of the tensile specimen was created in such a way that the direction of the print path of the 3D printer nozzle was transverse, specifically orthogonal, to the longitudinal extent of the tensile specimen, and the print layers produced by the nozzle created the longitudinal extent of the tensile specimen.

[0043] Printability was assessed using a specially developed accuracy test. This test involves printing a test specimen to specified dimensions, measuring the printed specimen, and then evaluating printability based on any deviations between the actual and target dimensions.

[0044] The test specimen was produced by a 3D printer, including the 3D printer already used, employing a 0.4 mm diameter print nozzle. After printing, the test specimen was allowed to cool to ambient temperature before measurement. The specimen was then removed from the printer's build plate.

[0045] The test specimen had three adjacent, flat walls, which were perpendicular to each other. The test specimen was thus shaped like a corner region of a cuboid, with each wall forming sections of the cuboid's faces. The following criteria were used to assess printability: • Deviation of the actual value from the target value with regard to at least one selected edge length of the test specimen, • Deviation of the actual value from the target value with regard to the angular position of at least two of the walls of the test specimen, • Deviation of the actual value from the target value with regard to full-surface contact of at least one outer side surface of the test specimen.

[0046] These criteria were used to assess whether and to what extent printability was present. A distinction was made between "not printable", "printable", "good printability" and "particularly good printability".

[0047] The exemplary polymer composites are a selection of ten composites, referred to below as "K1" to "K10". These exemplary polymer composites had a polymer content of 15% to 19% of the total dry mass of the composite. Specifically, these were the following mass fractions: approximately 19% for K1, approximately 18% for K2, approximately 18% for K3, approximately 17% for K4, approximately 16% for K5, approximately 16% for K6, approximately 15% for K7, approximately 18% for K8, approximately 18% for K9, and approximately 17% for K10.

[0048] All ten exemplary polymer composites contained the carbon fibers described above, in a proportion of 9% to 17% of the total dry mass of the composite. Specifically, these were the following mass fractions: approximately 10% for K1, approximately 17% for K2, approximately 16% for K3, approximately 14% for K4, approximately 10% for K5, approximately 13% for K6, approximately 10% for K7, approximately 9% for K8, approximately 10% for K9, and approximately 10% for K10.

[0049] One of the exemplary polymer composites, namely composite K1, contained the carbon black particles described above, but no carbon nanostructures. The proportion of carbon black particles was approximately 9%, based on the total dry mass of composite K1.

[0050] Four more of the exemplary polymer composites, namely composites K2, K3, K4, and K5, had the carbon nanostructures described above, but no carbon black particles. The proportion of carbon nanostructures in the total dry mass of the composite ranged from 1% to 6%. Specifically, these were the following mass fractions: approximately 1% for K2, approximately 2% for K3, approximately 3% for K4, and approximately 6% for K5.

[0051] The remaining five exemplary polymer composites, namely composites K6, K7, K8, K9, and K10, contained the carbon nanostructures and carbon black particles described above. The proportion of carbon nanostructures in the total dry mass of the composite ranged from 1% to 6%. Specifically, these were the following mass fractions: approximately 1% for K6, approximately 2% for K7, approximately 6% for K8, approximately 2% for K9, and approximately 4% for K10. The proportion of carbon black particles in the total dry mass of the composite also ranged from 2% to 6%. Specifically, these were the following mass fractions: approximately 2% for K6, approximately 3% for K7, approximately 3% for K8, approximately 6% for K9, and approximately 3% for K10.

[0052] The exemplary polymer composites considered here each had a bulk electrical conductivity that lay within a predefined target range. The target range was defined as a bulk electrical conductivity between 10 -7The values ​​S / cm and 1 S / cm were used as a basis. Furthermore, the exemplary polymer composites considered here each had a tensile strength exceeding a specified minimum value. A tensile strength of 15 MPa was used as the minimum value. In addition, the exemplary polymer composites considered here were each classified as at least "printable".

[0053] Table 1 provides an overview of the properties determined for the exemplary polymer composites K1 to K10. The last three columns list the determined values ​​for the electrical volume conductivity σ, the tensile strength Rm, and the printability (column labeled "printable"). For simplicity, the categories "printable," "good printability," and "very good printability" have been abbreviated with plus signs. One plus sign ("+") means "printable," two plus signs ("++") mean "good printability," and three plus signs mean "very good printability."

[0054] The carbon fibers, carbon nanotubes, and carbon black particles contained in the exemplary composites are listed in columns 2 to 4 and are labelled "fiber," "nano," and "carbon black," respectively. The mass fraction in each case is given as a percentage relative to the mass fraction of the polymer P used, i.e., "% / % P." This corresponds to the notation "% relative to 100 mass fractions of the polymer" also used in the present disclosure. Table 1 Composite Fiber [% / % P] Nano[% / % P] Soot [% / % P] σ[S / cm] Rm[MPa] printable K1 12 0 12 0,001 29 ++ K2 21 1,2 0 0,0001 35 ++ K3 20 2,4 0 0,010 31 +++ K4 17 3,6 0 0,033 27 +++ K5 12 7,0 0 0,203 20 ++ K6 15 1,2 2,4 0,001 36 ++ K7 12 2,4 3,5 0,018 36 ++ K8 11 7,3 3,7 0,157 18 + K9 12 2,4 7,3 0,136 35 ++ K10 12 4,8 3,6 0,195 22 +++

[0055] The polymer composites described in the present disclosure contain, for example, at least one polymer and carbon fibers and carbon nanostructures and / or carbon black particles. The present disclosure specifies embodiments in which no carbon nanostructures are included, i.e., said embodiment is free of carbon nanostructures. In the present disclosure, the term "free of carbon nanostructures" also means that the proportion of carbon nanostructures is less than 0.1% of the total dry mass of the polymer composite.

[0056] The present disclosure specifies embodiments in which no soot particles are contained, i.e., said embodiment is free of soot particles. In the present disclosure, the term "free of soot particles" also includes the proportion of soot particles that is less than 0.1% of the total dry mass of the polymer composite.

[0057] Although the numerical ranges and parameters that define the broad scope of this disclosure are approximations, the numerical values ​​presented in the specific examples are reproduced as accurately as possible. However, each numerical value inherently includes certain errors that necessarily result from the standard deviation found in the respective test measurements. Furthermore, all ranges described herein are to be understood as including the endpoints themselves for the respective range, and the described ranges encompass all sub-ranges subsumed therein. Unit list Siemens nm nanometers µm micrometer mm millimeters cm Centimeter % percent wt.% weight percent % / % P mass percent per mass percent polymer S / cm Siemens per centimeter MPa Megapascal

Claims

[1] Polymer composite with a bulk electrical conductivity between 10 -7 S / cm and 1 S / cm, consisting of or containing • a preferably thermoplastic polymer, • Carbon fibers and • Carbon nanostructures. [2] Polymer composite with a bulk electrical conductivity between 10 -7 S / cm and 1 S / cm, consisting of or containing • a preferably thermoplastic polymer, • Carbon fibers and • Soot particles. [3] Polymer composite with a bulk electrical conductivity between 10 -7 S / cm and 1 S / cm, consisting of or containing • a preferably thermoplastic polymer, • Carbon fibers, • Carbon nanostructures and • Soot particles. [4] Composite according to any of the preceding claims, wherein the carbon fibers have an average fiber length between 20 µm and 2 mm. [5] Composite according to any of the preceding claims, wherein the carbon fibers have a diameter between 5 µm and 20 µm. [6] Composite according to any of the preceding claims, wherein the carbon fibers constitute between 5% and 26% of the polymer by mass. [7] Composite according to claim 1, wherein the carbon nanostructures have a proportion between 0.1% and 12%, based on 100 mass fractions of the polymer. [8] Composite according to claim 1, wherein at least a subset of the carbon nanostructures is formed as tubes. [9] Composite according to claim 1, wherein at least a subset of the carbon nanostructures is formed as flakes. [10] Composite according to any one of claims 3 to 9, wherein the carbon nanostructures have a proportion between 0.1% and 12%, based on 100 mass fractions of the polymer. [11] Composite according to any one of claims 3 to 10, wherein at least a subset of the carbon nanostructures is formed as tubes. [12] Composite according to any one of claims 3 to 11, wherein at least a subset of the carbon nanostructures is formed as flakes. [13] Composite according to any one of claims 2 to 6 and 10 to 12, wherein the soot particles have a mean particle size between 10 nm and 100 nm. [14] Composite according to one of claims 2 to 6 and 10 to 13, wherein the soot particles are of the type of conductivity soot. [15] Composite according to any one of claims 2 to 6 and 10 to 14, wherein the carbon black particles have a proportion between 0.1% and 13%, based on 100 mass fractions of the polymer. [16] Composite according to any of the preceding claims, wherein the polymer has a mass fraction between 40% and 99%, based on the dry mass of the composite. [17] Composite according to any of the preceding claims, wherein the polymer comprises at least one repeating unit selected from the group consisting of or containing acrylate units, carboxylic ester units, amide units, lactic acid units, benzimidazole units, carbonate ester units, ether units, sulfone units, aryl ketone units, aryl ether units, aryl alkyl units, etherimide units, ethylene units, phenylene oxide units, propylene units, styrene units, vinyl halide units and carbamate units. [18] Composite according to claim 17, wherein the polymer is a copolymer of two or more of the repeating units. [19] Composite according to claim 18, wherein the copolymer comprises one or more acrylate units. [20] Composite according to any of the preceding claims, wherein the polymer comprises at least one polymer selected from the group consisting of or comprising polyacrylates, polybenzimidazoles, polycarbonates, polyethersulfones, polyaryletherketones, polyethylenes, polyphenylene oxides, polypropylenes, polystyrenes, polyesters, polyurethanes, polyamides, polyvinylidene fluorides, polyvinyl chlorides, polyetheretherketones, polydicyclopentadiene, poly(ethylene-covinyl acetate), polyetherimides, polypropylenes, poly(vinylidene fluoride-co-hexafluoropropylene), poly(styrene-isoprene-styrene), acrylonitrile butadiene styrenes, poly(styrene-ethylene-butylene-styrene), polyethylene terephthalates, polylactic acids, polydiketoenamines, poly(hydroxybutyrate-co-hydroxyhexanoate) and polycaprolactones. [21] Granules for a 3D printer, consisting of or containing a composite according to any one of claims 1 to 20. [22] Paste for a 3D printer, consisting of or containing a composite according to any one of claims 1 to 20. [23] Filament consisting of or containing a composite according to any one of claims 1 to 20 and designed to be used as a printing wire in a 3D printer. [24] Component comprising at least one composite according to any one of claims 1 to 20. [25] Use of a composite according to any one of claims 1 to 20 for the manufacture of electrically conductive components, in particular electronic components and sensor components.