Molly Ayala
Plastic is an organic compound made up of carbon atoms, or carbon atoms with added oxygen, nitrogen, and sulphur. Its structure means it has no ionic character and therefore cannot conduct electricity. As a result, it is used as an insulator on wires and in other places. Plastic is likely to melt under a large current, and it has few to no free electrons, which are necessary to conduct electricity.
| Characteristics | Values |
|---|---|
| Conductivity | Poor |
| Reactivity | Non-reactive |
| Melting | Melts under large currents |
| Free electrons | Few or none |
| Ionic character | None |
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What You'll Learn
Plastics have a high molecular weight
Plastics are organic compounds with high molecular weight. They are formed by carbon atoms or carbon atoms with the addition of oxygen, nitrogen, and sulphur. The chains comprise many repeated units formed from monomers. Each polymer chain will have several thousand repeating units. The backbone is the part of the chain that is on the main part that links together a large number of repeated units.
The molecular weight of a polymer is the sum of the atomic weights of the individual atoms that comprise a molecule. It indicates the average length of the bulk resin's polymer chains. The average molecular weight can be determined by several means, but this is not always known exactly. One common way of expressing the length of a polymer chain is the degree of polymerization, which quantifies the average number of monomers incorporated into the polymer chain.
Low-molecular-weight polyethylene chains have backbones as small as 1000 carbon atoms long. Ultra-high-molecular-weight polyethylene chains can have 500,000 carbon atoms along their length. Many plastics are available in a variety of chain lengths or different molecular weight grades. These resins can be classified by viscosity value, rather than molecular weight. Within a resin family, such as polycarbonate, higher molecular weight grades have higher melt viscosities.
Plastics have few or no free electrons because their molecules are formed of lengthy chains of carbon and hydrogen atoms. The number of electrons in an atom's outer shell determines its conductivity. Therefore, plastics are poor electrical conductors and are used as insulators on wires and in other places.
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They are organic compounds
Plastics are synthetic materials created through human industrial processes, and they are derived from organic compounds, typically involving the polymerization of molecules of certain hydrocarbons. Hydrocarbons are compounds that consist of hydrogen and carbon atoms, and they form the basis of organic chemistry. In the context of electrical conductivity, it is important to understand that plastics, due to their organic composition, often exhibit unique electrical properties that set them apart from metals or other conductive materials. The carbon-hydrogen bonds present in plastics contribute to their non-conductive nature.
Now, let's delve a bit deeper into the organic compounds that constitute plastics and how they contribute to their electrical properties: Plastics are typically polymers, which means they are large molecules composed of many repeating subunits, known as monomers. These monomers are usually derived from organic compounds, primarily hydrocarbons. Hydrocarbons, as the name suggests, are compounds that primarily consist of hydrogen and carbon atoms arranged in various ways. The specific arrangement and bonding of these atoms contribute to the unique properties of each hydrocarbon and, consequently, the plastic created from them.
The carbon atom is unique in its ability to form four strong covalent bonds, which can be with other carbon atoms or with hydrogen atoms. In organic compounds, carbon atoms often form rings or long chains, resulting in a diverse range of molecules. When carbon bonds with hydrogen, as is common in hydrocarbons, the electrons in the bonds are tightly held and not easily shared or transferred. This characteristic contributes to the non-conductive nature of plastics. In contrast, materials that are good conductors of electricity, like metals, have electrons that are more loosely bound and can move freely, facilitating the flow of electric charge.
The specific type of hydrocarbon and its structure play a significant role in the electrical properties of the resulting plastic. For example, polyethylene, a common plastic, is a polymer of ethylene, a simple hydrocarbon with a carbon-carbon double bond. Through polymerization, the double bond in ethylene is "opened up," and the carbon atoms form strong single bonds with carbon atoms in adjacent monomer units, creating long chains of carbon-carbon bonds. These strong carbon-carbon bonds contribute to the overall strength and durability of the plastic but also to its insulating properties.
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Plastics have no ionic character
Plastics are bad conductors of electricity. They are used as insulators on wires and in electronics packaging. This is because plastics have few or no free electrons. The number of electrons in an atom's outer shell determines its conductivity. Metal, for example, is a good conductor because it has a high number of free electrons.
Plastics, on the other hand, are organic compounds with no ionic character. They are formed by carbon atoms or carbon atoms with the addition of oxygen, nitrogen, and sulphur. The chains comprise many repeated units formed from monomers. Each polymer chain will have several thousand repeating units. The backbone is the part of the chain that links together a large number of repeated units.
Plastics are synthetic materials derived from organic (carbon-containing) compounds. The most common sources for carbon compounds are oil (petroleum) and natural gas. Plastics are polymers, which are long molecule chains often mixed with other substances such as colouring agents and softeners. Polymers do not have to be plastics, and many natural substances are polymers, such as cellulose, proteins, silk, wool, cotton, wood, leather, and DNA.
While there are emerging ionic plastic crystals, particularly organic ionic plastic crystals (OIPCs) and protic organic ionic plastic crystals (POIPCs), these are not the same as the conventional plastics used in most applications. These ionic plastics are solid protic organic salts formed by proton transfer from a Brønsted acid to a Brønsted base. They have been found to be promising solid-state proton conductors for high-temperature proton-exchange membrane fuel cells.
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They have no free electrons
Plastic is a poor conductor of electricity. This is because plastics are non-metals, and non-metals are poor conductors of electricity. Metals, on the other hand, are good conductors.
The number of electrons in an atom's outer shell determines its conductivity. Electric charges are carried by free electrons. If there are no free electrons, electric charges cannot be carried and, therefore, electricity cannot be conducted.
Plastics have few or no free electrons. This is due to their molecular structure. Plastics are organic compounds, formed by carbon atoms or carbon atoms with the addition of oxygen, nitrogen, and sulphur. Their molecules are made up of long chains of carbon and hydrogen atoms. Each polymer chain has several thousand repeating units, formed from monomers. The backbone of the chain is the part that links together a large number of these repeated units.
Because plastics have no free electrons, they cannot conduct electricity. This is why they are used as insulators on wires and in other places.
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Plastic melts in the face of a large current
Plastics are poor conductors of electricity. They are organic compounds with no ionic characteristics, which are required for the conduction of electricity. The molecules of plastic are made up of long chains of carbon and hydrogen atoms, which can also include oxygen, nitrogen, and sulphur. These polymers do not have free electrons, which are necessary to conduct electric charges. Therefore, in the face of a large current, plastic will melt.
Plastic's poor conductivity is precisely why it is used as an insulator on wires and in other applications. Metals, on the other hand, are good conductors due to their high number of free electrons. The number of electrons in an atom's outer shell determines its conductivity.
The structure of plastic also contributes to its poor conductivity. Each polymer chain in plastic has several thousand repeating units, forming a backbone that links a large number of these units together. This high molecular weight structure is typically synthesised from low molecular weight compounds.
Plastics are non-reactive and have a high melting point, which further explains their inability to conduct electricity effectively. Their lack of reactivity and high melting point can be attributed to their long chains of carbon and hydrogen atoms, which are strongly bonded and resistant to breaking down or reacting with other substances.
In summary, plastic's unique molecular structure, lack of free electrons, and non-reactivity make it a poor conductor of electricity. When faced with a large current, plastic's physical properties cause it to melt rather than conduct the electric charge. This characteristic of plastic is both a benefit and a limitation, depending on the application.
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Frequently asked questions
Yes, plastic is a bad conductor of electricity.
Plastics are organic compounds and for the conduction of electricity, ionic characteristics are required. Plastic does not have any ionic character and hence, conduction of electricity is not possible.
In the face of a large electric current, plastic will melt.
Metals are good conductors of electricity.
