Omar Khalid
Plastic is a non-metal material that is generally considered a poor conductor of electricity. This property makes it useful for insulating electric cables and preventing electric shocks. However, recent advancements in technology have led to the development of conductive plastics, challenging the traditional understanding of plastic's electrical properties. These new plastics can be made to conduct electricity like metals, offering exciting possibilities for various applications, especially in the automotive and aerospace industries. While the concept of conductive plastics may seem counterintuitive, it showcases the potential for innovation and the ongoing pursuit of enhancing our understanding and manipulation of materials.
| Characteristics | Values |
|---|---|
| Electrical conductivity | Poor |
| Insulating properties | Good |
| Weight | Light |
| Cost | Inexpensive |
| Flexibility | Flexible |
| Robustness | Robust |
| Electrical resistivity | High |
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What You'll Learn
Plastic is an insulator
While plastic is typically an insulator, researchers have discovered methods to make plastic conduct electricity. In 2000, Alan MacDiarmid, along with his colleagues, was awarded the Nobel Prize in Chemistry for demonstrating that plastics can conduct electricity under certain circumstances. They created conductive polymers, a type of plastic that can conduct electricity similarly to metals.
One technique to make plastic conductive involves using an ion beam to modify the properties of a plastic film. By treating the surface of a plastic sheet with an ion beam and incorporating a thin film of metal, Australian researchers have successfully created a conductive plastic film. This process results in a material that is not only conductive but also strong, flexible, and inexpensive.
Another approach to making plastic conductive is through a composite material. By mixing plastic and metal through a special process, a single, homogeneous material with electrical conductivity similar to that of metals can be created. This composite material offers chemical stability, low weight, and efficient electrical and thermal conductivity.
While these advancements in conductive plastics are exciting, it's important to note that the traditional view of plastic as an insulator still holds true in most cases. However, with ongoing research and development, we may see more applications of conductive plastics in the future, revolutionizing industries such as electronics and manufacturing.
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Metals conduct electricity
Metals are generally very good electrical conductors, meaning they allow electric current to flow easily. Materials that do not let current flow easily are called insulators, and most non-metal materials, such as plastic, wood, and rubber, are insulators.
Metallic bonding also contributes to the conduction of electricity in metals. Metal atoms are surrounded by a large, constantly moving body of delocalized electrons that are not linked to a specific atom. These delocalized electrons can move and repel one another in the direction of an electric current, conducting electricity throughout the metal.
The electrical conductivity of metals is also influenced by their resistivity, which is the opposite of conductivity and measures how strongly a metal opposes the flow of electric current. Metals with low resistivity and high conductivity are good conductors. Additionally, the presence of impurities can affect the resistivity of metals, particularly in the case of semiconductor metals or metalloids.
In summary, metals conduct electricity due to their unique atomic structure, which allows for the free movement of electrons and the formation of metallic bonds. The number of free electrons, the presence of valence electrons, and the resistivity of the metal all contribute to its conductivity. These properties make metals ideal for use in various industry-specific applications, including electrical wiring.
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Plastic-metal hybrids
Plastic is a great insulator of electricity because, at the atomic level, plastics are made up of long chains of carbon atoms, bonded with hydrogen, oxygen, or other elements. The electrons in these bonds are tightly held and they can’t move about like they do in metals. However, researchers have been working on creating plastic-metal hybrids that can conduct electricity.
In 2008, researchers at IFAM in Bremen devised a solution that combines the best of both worlds without requiring new machinery to process the components. The solution is a composite material where the different materials are not merely slotted together or bonded, but mixed in a special process to form a single material. This process produces a homogeneous and fine-meshed electrically conductive network. The composite possesses the desired chemical stability and low weight, coupled with the electrical and thermal conductivity of metals.
In 2022, scientists at the University of Chicago discovered a way to create a material that can be made like a plastic but conducts electricity more like a metal. The research, published in Nature, shows how to make a kind of material in which the molecular fragments are jumbled and disordered, but can still conduct electricity extremely well. The scientists were astonished to find that the material easily and strongly conducted electricity and was very stable.
These plastic-metal hybrids have many potential applications, especially in the automobile and aircraft industries. For example, headlamp housings on cars and components of aircraft, such as the fuselage, are currently made of plastic but require punched metal sheets to be installed for illumination. With the new plastic-metal hybrids, these components could be produced more efficiently and at a lower cost. Additionally, these hybrids can be used as discharge structures on aircraft components, providing protection from lightning strikes.
Overall, the development of plastic-metal hybrids that can conduct electricity offers exciting possibilities for various industries, combining the advantages of both plastic and metal while mitigating their respective drawbacks.
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Conductive plastic films
Plastics are typically poor conductors of electricity, which is why they are often used to insulate electric cables. However, researchers have discovered methods to make plastics conductive. One such method involves placing a thin film of metal onto a plastic sheet and mixing it into the polymer surface with an ion beam. This process can be used to create cheap, strong, flexible, and conductive plastic films. These films can be used in various applications, such as electrical resistance thermometers, meeting industrial standards.
One company that offers conductive plastic films is CAPLINQ, with its LINQSTAT-branded electrically conductive and antistatic plastic films. These films have a surface resistance of less than 100,000 ohms-per-square for antistatic properties and less than 10,000 ohms-per-square for electrical conductivity. LINQSTAT offers different grades of materials, allowing users to cover a wide range of applications. The films are also unaffected by humidity and age.
Another company, Premix, offers electrically conductive plastics with good dispersion and a wide range of base polymers. Their PRE-ELEC® product family covers a broad conductivity spectrum, and they have been in the business of producing high-quality functional plastics for over 30 years.
The most common additive used to make plastics electrically conductive is carbon black. Carbon black offers superior price-performance and stable properties over time. It is suitable for compounds with surface resistance of up to 10^6 ohms and can be used in dissipative areas of up to 10^8 ohms in certain applications. By increasing the percentage of carbon black filler, the conductivity of the plastic can be enhanced.
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Conductive polymers
Plastics are typically poor conductors of electricity and are used to insulate electric cables. However, researchers have discovered ways to make plastics conductive by using conductive polymers. These polymers are organic polymers that can conduct electricity similarly to metals. The discovery of conductive polymers has been deemed significant enough to win multiple Nobel Prizes in Chemistry.
The advantages of conductive polymers over conventional metals include ease of processing, low cost, lightweight, and robustness. Conductive polymers can be used in applications such as optoelectronics, material science, and biomedical applications. For example, conductive polymers can be used in the production of headlamp housings for cars, reducing the need for punched metal sheets.
While conductive polymers offer high electrical conductivity, they also have disadvantages such as thermal and mechanical instabilities that limit their usage in certain electronic applications. Additionally, the low solubility of most polymers presents challenges in their synthesis. However, researchers are addressing these challenges by adding solubilizing functional groups to monomers or forming nanostructures and surfactant-stabilized conducting polymer dispersions in water.
In conclusion, conductive polymers have revolutionized the field of plastics by providing a way to create cheap, strong, flexible, and conductive plastic films. With further research and development, these polymers may find even more applications in various industries.
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Frequently asked questions
Plastic is a non-metal material that is generally a poor conductor of electricity. It is often used to insulate electric cables as it does not let current flow easily.
Yes, researchers have discovered ways to make plastics conductive. One method involves placing a thin film of metal onto a plastic sheet and mixing it into the polymer surface with an ion beam. This creates a plastic film that can conduct electricity.
Conductive plastics offer a combination of desirable properties, including light weight, low cost, flexibility, and good electrical conductivity. They can be used in various applications, such as electrical resistance thermometers, and can simplify manufacturing processes by eliminating the need for separate metal circuit boards.
