Molly Ayala
Plastics are generally considered poor conductors of electricity due to their lack of free electrons, which are necessary for conducting electric charges. This property makes them useful insulators in electrical wiring and electronics packaging. However, it is important to note that plastics can conduct electricity under certain conditions, such as when exposed to high voltages or through the addition of substances like iodine, which increase their conductivity. The discovery that plastics can, in fact, conduct electricity under specific circumstances was made in the early 1970s and earned the researchers a Nobel Prize in Chemistry in 2000.
| Characteristics | Values |
|---|---|
| Conductivity | Plastics are poor conductors of electricity due to the absence of free electrons. However, they can conduct electricity under certain circumstances, such as by adding iodine to the polymer or applying a high voltage. |
| Reactivity | Plastics are non-reactive. |
| Melting Point | Plastics can melt when exposed to high currents or powerful electric currents. |
| Free Electrons | Plastics have a low number of free electrons due to their molecular structure of long chains of carbon and hydrogen atoms. |
| Insulation | Plastics are commonly used as insulators on wires and in electronics packaging due to their poor conductivity. |
Explore related products
What You'll Learn
Plastic can conduct electricity under certain circumstances
Plastics are generally considered poor conductors of electricity and are often used as insulators on wires and in other electrical applications. This is because plastics have few or no free electrons, which are necessary for conducting electricity. In contrast, metals have a high number of free electrons, making them excellent conductors.
However, it is important to note that plastics can conduct electricity under certain circumstances. For example, in 2000, Alan MacDiarmid, along with his colleagues Hideki Shirakawa and Alan J. Heeger, discovered that plastics could be made to conduct electricity by adding iodine to the polymer. Iodine is a strong oxidant that attracts the electrons in the polymer, reducing the density of electric charge carriers and allowing them to flow more freely, similar to metals. This discovery led to the first plastic known to conduct electricity—polyacetylene.
The conductive properties of polyacetylene were attributed to the addition of oxidants, although this also led to a reduction in conductivity levels due to reaction with atmospheric oxygen. Nevertheless, this discovery challenged the long-held belief that metals conduct electricity, while plastics do not, revealing a more complex reality.
It is worth mentioning that all insulators, including plastics, have a breakdown voltage at which they can become excellent conductors. For example, electric arc lighters can produce high enough voltages to make air conduct electricity and potentially force plastics to conduct as well. Additionally, a strong electric current can burn through plastic, melting it and potentially starting a fire, further emphasizing the importance of using appropriate fuse plugs in electrical products.
Electric Blankets: Costly Comfort or Efficient Warmth?
You may want to see also
Explore related products
Iodine increases the conductivity of plastic
Plastics are generally considered poor electrical conductors, which is why they are often used as insulators on wires. However, plastics can conduct electricity under certain circumstances. In 2000, Alan MacDiarmid, along with his colleagues Hideki Shirakawa and Alan J. Heeger, proved that plastics can conduct electricity and were awarded the Nobel Prize in Chemistry for their discovery.
One way to increase the conductivity of plastics is by adding iodine to the polymer. Iodine is a halogen and a strong oxidant that attracts the electrons in the polymer effectively. This causes the electric charge carriers in the polymer to become less densely packed and more agile, allowing them to flow, similar to metals.
The addition of iodine to polyacetylene, for example, resulted in increased conductivity due to the formation of polyiodine ions. This made polyacetylene the first plastic to be recognized as a conductor of electricity. However, the conductive properties were also attributed to the addition of oxidants, which react with atmospheric oxygen, leading to a reduction in conductivity levels.
Further research has been conducted on the iodine penetration and doping of ion-modified polyethylene. Studies have found that the amount of iodine incorporated into the polymer depends on factors such as the fluence of ions and the available free volume. The electrical conductivity of the polymer is influenced by the formation of CTCs (charge transfer complexes) and the interaction of iodine with the crystalline lattice, resulting in distortions and modifications.
Overall, the addition of iodine increases the conductivity of plastics by enhancing the mobility of electric charge carriers and altering the crystalline structure of the polymer. This discovery has opened up new possibilities for the use of conductive polymers in various applications, including electronic devices and electromagnetic shielding.
Adjusting Your Electric Garage Door Opener: A Simple Guide
You may want to see also
Explore related products
Polyacetylene is a plastic that can conduct electricity
Plastics are generally considered poor conductors of electricity, which is why they are often used as insulators. However, in certain circumstances, plastics can indeed conduct electricity.
In 2000, Alan MacDiarmid, along with his Japanese colleague Hideki Shirakawa and US natural scientist Alan J. Heeger, was awarded the Nobel Prize in Chemistry for proving that plastics can conduct electricity. The discovery came about by chance in the early 1970s when Shirakawa was in the process of manufacturing polyacetylene (PAC), a plastic used for electrical insulation. A young Korean student at Tokyo Metropolitan University made a mistake with the dose, resulting in the creation of a polyacetylene film. This film was found to have conductive properties, making polyacetylene the first plastic known to conduct electricity.
At the physical level, the conductive properties of polyacetylene are due to the addition of oxidants, particularly iodine, which react with atmospheric oxygen. Iodine is a strong oxidant that attracts the electrons in the polymer, making them more agile and able to flow, similar to metals. While the initial conductivity level of polyacetylene was very good, the reaction with atmospheric oxygen led to a considerable reduction in conductivity.
Polyacetylene is a linear-backbone "polymer black" and is one of the main classes of conductive polymers. It has alternating single and double bonds with lengths of 1.44 and 1.36 Å, respectively. While polyacetylene is not a metal, it can exhibit high electrical conductivity, especially when doped with iodine. The highest reported conductivity of stretch-oriented polyacetylene is around 80 kS/cm (8 MS/m).
In summary, polyacetylene is a plastic that can conduct electricity due to its unique chemical structure and the addition of oxidants like iodine. This discovery has opened up new possibilities for the use of plastics in electrical applications and highlights the complex nature of electrical conductivity in materials.
Electric Sheep Dreams: Androids and Their Synthetic Fantasies
You may want to see also
Explore related products
Plastics have few or no free electrons
Plastics are generally considered poor conductors of electricity, which is why they are often used as insulators on wires and in other applications. However, it is important to note that under certain conditions, plastics can exhibit conductive properties. This discovery led to Alan MacDiarmid, Hideki Shirakawa, and Alan J. Heeger being awarded the Nobel Prize in Chemistry in 2000.
The conductive properties of a substance depend on the number of free electrons in its atomic structure. Metals, for example, have a high number of free electrons in their outer shell, making them excellent conductors of electricity. In contrast, plastics typically have few or no free electrons because their molecules are composed of long chains of carbon and hydrogen atoms.
The absence or scarcity of free electrons in plastics means that they cannot carry electric charges effectively. Electric charges are transported by free electrons, so if there are none available, electricity cannot be conducted. This is why plastics are typically classified as non-conductors or insulators.
However, it is important to note that the conductive properties of plastics can be altered. For example, by adding iodine to the polymer, the conductivity of the plastic can be increased. Iodine is a strong oxidant that attracts the electrons in the polymer, causing the electric charge carriers to become less densely packed and more agile, enabling them to flow similarly to metals. This discovery challenged the long-held belief that metals conduct electricity while plastics do not.
While plastics may have few or no free electrons, it is important to recognize that their conductive properties are not absolute. With modifications or under specific conditions, plastics can exhibit conductivity. However, in most cases, plastics remain poor conductors due to the absence or low number of free electrons in their atomic structure.
Aldi's Offer: Electric Carts for Disabled Shoppers
You may want to see also
Explore related products
Electric arc lighters can make plastic conduct electricity
Plastic is generally considered a poor conductor of electricity due to its lack of free electrons. This is why it is often used as an insulator on wires and in other applications. However, it is important to note that plastics can conduct electricity under certain conditions.
An electric arc lighter works by creating an electric arc, which is a continuous electrical discharge that occurs in the gas-filled space between two conductive electrodes. This arc can ignite materials such as paper or wood by transferring a large amount of energy to them. While plastic is not a good conductor of electricity, an electric arc lighter can still cause it to ignite if the current is strong enough. This is because the high temperatures generated by the electric arc can melt or vaporize the plastic, causing it to burn.
The susceptibility of plastic to degradation by an electric arc varies depending on its type. For example, polytetrafluoroethylene has a higher arc resistance compared to polyethylenes, polystyrenes, and polyvinyl chlorides. Additionally, plastics can be formulated to emit arc-extinguishing gases, which can help prevent the spread of fires caused by electric arcs.
It is worth noting that the discovery that plastics can conduct electricity under certain circumstances was made by Alan MacDiarmid, Hideki Shirakawa, and Alan J. Heeger, who were awarded the Nobel Prize in Chemistry in 2000. They found that by adding iodine to the polymer, the conductivity of the plastic could be increased. This discovery challenged the long-held belief that metals conduct electricity, while plastics do not.
In summary, while plastic is generally a poor conductor of electricity, electric arc lighters can still cause plastic to ignite if the current is strong enough to melt or vaporize the material. Additionally, the conductivity of plastics can be altered through the addition of certain substances, such as iodine, further highlighting the complex nature of electricity conduction in plastics.
Electric Hoist Installation: Mounting to the Ceiling
You may want to see also
Frequently asked questions
Plastics are generally considered poor conductors of electricity due to their lack of free electrons. However, under certain circumstances, they can conduct electricity.
The conductivity of plastic can be increased by adding iodine to the polymer. This was discovered by chemist Alan MacDiarmid and his colleagues, who were awarded the Nobel Prize in Chemistry in 2000.
Plastics have low conductivity due to their molecular structure, which consists of long chains of carbon and hydrogen atoms. This results in few or no free electrons available to carry electric charges.
Free electrons are essential for conducting electricity. The absence or low number of free electrons in plastics makes them poor conductors compared to metals, which have a high number of free electrons in their outer shell.
