Alexei Volkov
Plastic is a versatile material with a wide range of applications, from electrical appliances to beverage cups. One of its essential properties is its ability to act as an insulator, preventing the transfer of heat and electricity. This insulating characteristic makes plastic valuable for various purposes, including electrical insulation and thermal insulation in construction. However, recent developments by engineers at MIT have created a polymer that conducts heat, potentially revolutionizing how we manage heat in electronic devices. This novel polymer, known as polythiophene, offers a unique approach to heat dissipation in electronic casings. Nevertheless, plastic's traditional role as an insulator remains significant, and its flexibility, toughness, and chemical resistance contribute to its widespread use across industries.
| Characteristics | Values |
|---|---|
| Insulating properties | Plastics are good insulators of heat and electricity. |
| Thermal conductivity | Plastics restrict the movement of thermal energy. Polyurethane and polystyrene have some of the lowest thermal conductivity. |
| Electrical conductivity | Plastics do not have free electrons available for conduction mechanisms, unlike metals. |
| Elasticity | Plastics can return to their original size and shape when a deforming force is removed. |
| Toughness | Plastics can absorb energy and deform without fracturing. |
| Chemical resistance | Plastics can resist molecular reaction with liquids other than water. |
| Durability | Plastics have high strength, stiffness, and dimensional stability. |
| Fire resistance | Plastics with high dielectric strength properties exhibit good fire resistance. |
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What You'll Learn
Plastic is an electrical insulator
Plastic is a good electrical insulator. It is made up of polymers, which are long, repeating chains of macromolecules. These chains are tightly bound but extremely flexible, allowing plastic to be moulded into various shapes. This elasticity is one of the reasons why plastic is a good insulator.
Plastics are also good insulators of heat as they restrict the movement of thermal energy. Some plastics, such as polyurethane and polystyrene, have very low thermal conductivity and are often used as foams to increase insulating properties by trapping pockets of air within the material structure. This makes them ideal for home cavity insulation, cooking utensils, pans, and beverage cups.
However, it is important to note that not all plastics are good insulators. For example, engineers at MIT have developed a polymer that conducts heat. This polymer is lightweight and flexible and can conduct 10 times as much heat as most commercially used polymers. Despite this development, traditional polymers are still both electrically and thermally insulating, and plastics remain a common choice for insulation.
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Plastic is a thermal insulator
Plastics are considered good insulators of heat as they restrict the movement of thermal energy. When any two objects of differing temperatures touch, there will always be thermal conduction, but some materials have lower thermal conductivity than others. Plastics are used where thermal transfer must be restricted, such as in home cavity insulation, cooking utensils, pans, and beverage cups. Polyurethane and polystyrene have some of the lowest thermal conductivity. They are commonly used as foam to increase the insulating properties through trapping pockets of air within the material structure.
The thermal insulating capacity of plastics is rated by measuring thermal conductivity. Thermal conduction is the transfer of heat from one part of a body to another with which it is in contact. The thermal conductivity of plastics increases with the incorporation of inorganic fillers, which have high thermal conductivity. In contrast, the incorporation of gaseous fillers in the structure decreases heat conduction.
While plastic is generally a good insulator, engineers at MIT have developed a polymer that is a heat conductor, dissipating heat rather than insulating it. This polymer can conduct 10 times as much heat as most commercially used polymers.
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Plastic is elastic
Plastic is a good insulator because it does not conduct heat or electricity. Its thermal conductivity is low, meaning it restricts the movement of thermal energy. This is due to the absence of free electrons available for conduction mechanisms. The thermal conductivity of plastics increases with the incorporation of inorganic fillers, which have high thermal conductivity. However, the addition of gaseous fillers has the opposite effect, decreasing heat conduction. The elasticity of plastics is also a contributing factor to their insulating properties.
Elasticity is a property common to plastics, which gives them the ability to resist a deforming force and return to their original size and shape when that force is removed. This elasticity is measured as Young's Modulus, which quantifies a material's performance under stress and strain. While no perfectly elastic materials exist, and all have an 'elastic limit', plastics are known for their flexibility and ability to form and mould into various shapes. This makes them ideal for applications such as dip moulding and dip coating, as well as insulation.
The insulating properties of plastics are advantageous in many applications. For example, plastic is often used for electrical appliances to prevent electrical conduction. Additionally, plastics are used in home cavity insulation, cooking utensils, and beverage cups to restrict thermal transfer and trap heat. Polyurethane and polystyrene, in particular, have very low thermal conductivity and are commonly used as foams to increase insulating properties by trapping pockets of air.
While most plastics are good insulators, engineers at MIT have recently developed a polymer that acts as a heat conductor, dissipating heat rather than insulating it. This polymer, known as polythiophene, can conduct heat 10 to 300 times more effectively than ordinary plastics. Despite this development, plastics with high dielectric strength and fire resistance continue to be excellent electrical insulators, making them valuable in various industries.
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Plastic is tough
Plastic is a good insulator because it does not conduct heat or electricity. It is made up of polymers, which are long, repeating chains of macromolecules. These molecules are tightly bound but flexible, allowing plastic to be moulded into various shapes. This elasticity is a key factor in plastic's ability to resist deformation and return to its original shape, which is why it is a good insulator.
Plastic's toughness, or its ability to absorb energy and deform without fracturing, is another reason why it is a good insulator. To test the toughness of a material, a sample is struck with a pendulum, and the energy absorbed is calculated. The more energy absorbed without fracture, the tougher the material. PVC, for example, is a high-toughness polymer.
Plastic's chemical resistance also contributes to its toughness and insulating properties. It is rated on a scale from A-D, with A/E indicating no attack or slight absorption, and D/F meaning the material will quickly decompose or dissolve. Plastic's chemical resistance makes it suitable for use in the food and drinks industry, as it prevents contamination over time.
While plastic is generally a good insulator, it is important to note that engineers at MIT have developed a polymer that acts as a heat conductor, dissipating heat rather than insulating it. This polymer, polythiophene, is designed to scatter heat away in all directions, addressing the issue of overheating in electronic devices. However, traditional polymers remain both electrically and thermally insulating, and plastic continues to be widely used for insulation in homes, appliances, and cooking utensils due to its toughness and insulating properties.
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Plastic is chemically resistant
Plastic is a good insulator because it does not conduct heat or electricity. This is due to the absence of free electrons in plastic, which are available in metals and enable conduction.
Plastic is also chemically resistant, which is a material's ability to resist molecular reaction with liquids other than water. This property is especially important in the food and drinks industry, where plastics are used for storage to prevent contamination from the material over long periods. The chemical resistance of plastics is rated from A-D, with A/E indicating no attack and negligible effect on mechanical properties, and D/F indicating the material will decompose or dissolve in a short period.
Plastics with high levels of chemical resistance include flexible fluoropolymers, which perform well in extreme temperatures and harsh chemical environments, and strong, stiff plastics, which have excellent chemical resistance and perform over a wide range of temperatures.
While plastic is a good insulator, it is worth noting that engineers at MIT have developed a polymer that conducts heat, which could be used for self-cooling casings for electronics. However, traditional polymers remain both electrically and thermally insulating.
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Frequently asked questions
Plastic is a good insulator because it does not conduct heat or electricity. This is due to the absence of free electrons in plastic, which prevents thermal and electrical conduction.
Plastic is often used as an insulator for electrical appliances and electronic devices. It is also used for home cavity insulation, cooking utensils, and beverage cups.
Plastic is lightweight, flexible, and has high toughness, meaning it can absorb energy without fracturing. It also has high strength, stiffness, and excellent fire resistance.
