Ethan Clarke
Rubber and plastic are both widely used materials with distinct chemical compositions, manufacturing processes, and sustainability profiles, making them suitable for different applications. They are made from the same families of polymers, but their structures differ, giving them unique properties. Rubber, a natural or synthetic substance, has high elasticity and is used in products that require greater flexibility, such as tires, hoses, and gaskets. Plastic, on the other hand, is generally more rigid and versatile for molding and shaping, but lacks the elastic properties of rubber. This paragraph will explore the differences between these two materials and provide insight into their uses and environmental impacts.
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What You'll Learn
- Natural rubber is made from the sap of rubber trees
- Synthetic rubber is made from petroleum byproducts
- Rubber is an elastomer, a polymer with elastic properties
- Plastic is a synthetic material made from long chains of polymers
- Plastic is generally rigid and does not return to its original form once deformed
Natural rubber is made from the sap of rubber trees
While plastics and rubber materials are both made from the same families of polymers, they are not the same. Rubbers are elastomers, which are polymers with an elastic property that differentiates them from plastics. Natural rubber, in scientific terms, is a polymer of the organic compound isoprene and is also classified as an elastomer.
The process of extracting latex from rubber trees is called tapping. It involves making incisions in the bark and collecting the fluid in vessels attached to the trees. The latex then undergoes a few more steps before it is sold as natural rubber. Manufacturers refine this latex into the rubber that is ready for commercial processing.
Natural rubber has been extensively used since the early 1830s, with "rubber fever" taking over as everyone wanted things made of the "new" waterproof gum from Brazil. However, its popularity faded as people became fed up with its messy nature and how it froze in winter and fell apart in summer heat. Charles Goodyear is credited with inventing the process of vulcanization of natural rubber, which solved these issues and led to its widespread use.
Today, natural rubber is still used in the modern processing of rubber and is an important source of income for indigenous populations. It is often mixed with synthetic rubber to optimize the properties of both materials. Natural rubber is commonly used in pneumatic applications such as tires and rubber bands.
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Synthetic rubber is made from petroleum byproducts
While rubber and plastic are both made from the same families of polymers, they are not the same. Plastic is always synthetic, whereas rubber is sometimes natural. Natural rubber is made from renewable latex derived from rubber trees. Synthetic rubber, on the other hand, is made from petroleum byproducts.
Synthetic rubber is an artificial elastomer, a polymer synthesized from petroleum byproducts. The process of creating synthetic rubber involves refining the source material, typically oil or coal, to derive a substance with the desired molecular weight. This is followed by the creation of polymers, which are long molecules that lend flexibility and strength to the material. Manufacturers often use Naphtha, a flammable liquid hydrocarbon mixture, in combination with fossil fuel products and natural gas, to produce monomer units that subsequently merge into polymer chains.
The most prevalent type of synthetic rubber is styrene-butadiene rubber (SBR), which is derived from the copolymerization of styrene and 1,3-butadiene. SBR is superior to standard formulations in terms of abrasion and crack resistance due to the addition of styrene. Butyl rubber, nitrile rubber, and ethylene propylene diene monomer (EPDM) are other examples of synthetic rubbers created using this method.
The development of synthetic rubber can be traced back to the late 19th and early 20th centuries. In 1879, Gustave Bouchardat discovered that heating isoprene with hydrochloric acid produced a rubber-like polymer. However, it was not until 1882 that William Tilden created the first truly synthetic rubber. During World War I, German scientists produced methyl rubber by polymerizing methylisoprene, but it was costly and inferior to natural rubber, leading to its discontinuation after the war.
The search for synthetic rubber alternatives intensified due to the limitations of natural rubber, which starts to degrade at temperatures above 180°C and is too brittle for many modern applications. Synthetic rubber offers improved performance characteristics, such as thermal stability and resistance to oils and related compounds. Additionally, certain synthetic rubbers lack the double bonds found in natural rubber's chain structure, making them more resistant to ozone cracking.
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Rubber is an elastomer, a polymer with elastic properties
Both rubber and plastic are made from the same families of polymers. Polymers are large molecules that consist of a series of smaller building blocks called monomers. However, rubber is an elastomer, a polymer with elastic properties. Elastomers are any rubbery material composed of long chain-like molecules, or polymers, that are capable of recovering their original shape after being stretched to great extents. The word "elastomer" is derived from "elastic polymer".
Natural rubber is an elastomer made from a type of latex extracted from the bark of the rubber tree, the Hevea brasiliensis or Hevea rubber tree. Natural rubber is still an important industrial polymer, but it now competes with a number of synthetics, such as styrene-butadiene rubber and butadiene rubber, which are derived from by-products of petroleum and natural gas. Synthetic elastomers are also made from petroleum.
The process of vulcanization, where rubber is heated with sulfur and other chemicals to 280-350 degrees Fahrenheit, improves the elasticity, hardness, tensile strength, weather resistance, and viscosity of rubber. Vulcanization also prevents rubber from becoming sticky in hot weather and brittle in cold weather. Vulcanization is a crucial step in making rubber useful, and rubber is frequently used to indicate elastomers that must be vulcanized or cured.
Elastomers are viscoelastic, meaning they are sticky and very elastic. They are used in countless applications for vibration dampening and insulation, such as moulding, gaskets, seals, shock absorbers, tires, and electronic cabling and wire insulation. Elastomers can hold both thermoset and thermoplastics properties. Thermoset and thermoplastic are two separate types of polymers or plastics used in the production of parts, components, and products. Thermoset polymers can resist high heat without losing their physical properties, whereas thermoplastic polymers cannot and have a low melting point.
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Plastic is a synthetic material made from long chains of polymers
Plastics are a group of materials that are either synthetic or semi-synthetic and derived from natural gas, petroleum, or renewable materials. The world's first fully synthetic plastic was Bakelite, invented in 1907 by Leo Baekeland, who coined the term "plastics". The word "plastic" is derived from the Greek word "plastikos", meaning "capable of being shaped or molded".
Plastics are polymers, which are substances made of many repeating units. The word "polymer" comes from the Greek words "poly", meaning "many", and "meros", meaning "parts" or "units". Polymers are large molecules formed by covalently joining many monomer units together in the form of chains. Monomers are the building blocks of polymers, and they can be simple or more complex ring-shaped structures containing multiple chemical elements.
The polymerization process generates thick, viscous substances known as resins, which are used to make plastic products. For example, ethylene monomers, when subjected to heat, pressure, and a catalyst, join together into long, repeating carbon chains, forming a plastic resin called polyethylene (PE). The PE-based resin is then processed in a factory to create plastic pellets, which are melted and cast into moulds to form solid plastic products.
Synthetic plastics are created through a reaction called polymerization, which can be performed in two ways: addition polymerization and condensation polymerization. In addition polymerization, monomers are added together in a long chain, forming a chain of paper clips. In condensation polymerization, two monomers combine to form a dimer, releasing a byproduct. These dimers then join to form tetramers, and the process continues.
Plastics are unique materials as their properties can be enhanced by additives. Additives are chemicals blended with polymers to create the desired characteristics in the final product, such as colour, toughness, and cleanliness. Without additives, plastics and rubbers would not have the desired properties.
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Plastic is generally rigid and does not return to its original form once deformed
While rubber and plastic are both made from polymers, they have distinct compositions and behaviours. Plastic is generally rigid and does not return to its original form once deformed. This is because plastic has a structure with long chains connecting to one another while also holding on to smaller atoms. This structure is what makes plastic versatile in terms of moulding and shaping. Thermoplastics, for example, are a type of plastic that becomes mouldable when heated and hardens upon cooling. Common examples include polyethylene, polyvinyl chloride (PVC), and polystyrene.
On the other hand, rubber is an elastomer, which means it has elastic properties. This elasticity is what differentiates rubber from plastic. Elasticity means that the material can be stretched and, when released, returns to at least 90% of its original dimensions and shape within a period of time, at room temperature. Rubber is made from long polymer chains that give it its elasticity. These polymers are made of smaller building blocks called monomers, which link together to form rubber’s flexible and durable structure.
The difference in elasticity and plasticity sets the two materials apart. Rubber is usually used in products that need greater elasticity, like gaskets, hoses, and tyres. Plastic, on the other hand, is used in a wide range of applications, from packaging to automotive parts and household items.
The manufacturing processes of rubber and plastic also differ. Natural rubber is derived from the sap of rubber trees, while synthetic rubber is typically produced using petroleum. Plastic is also a synthetic material made from long chains of polymers derived from crude oil or natural gas. The price of rubber and plastic also varies considerably. The price of natural and synthetic rubber constantly fluctuates based on supply and demand and the region of the world from which it is purchased. The factors in their manufacturing also make prices unstable. For example, natural rubber depends on crop yields, and it takes 6-8 years for a rubber tree to start producing latex. Synthetic rubber and plastic, on the other hand, depend on petroleum prices.
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Frequently asked questions
No, rubber and plastic are not the same. While they are both polymers, rubber is an elastomer, meaning it has elastic properties, unlike plastic.
Natural rubber is derived from the sap of rubber trees and is known for its high elasticity and durability. Synthetic rubber, on the other hand, is made from petroleum byproducts and includes variants like Styrene-Butadiene Rubber (SBR) and Nitrile Butadiene Rubber (NBR).
Examples of plastic include Polyethylene (PE), Polypropylene (PP), and PVC, each with unique properties suited for different applications such as packaging, automotive parts, or household items.
Natural rubber has a significantly lower negative impact on the environment as it is biodegradable, unlike synthetic rubber and plastic, which can take hundreds to thousands of years to decompose. It is also more versatile and can be molded into different shapes and sizes.
Rubber is commonly used in tires, hoses, and gaskets due to its resistance to oil, heat, and abrasion. Plastic, on the other hand, is used in a wide range of products, including packaging, automotive parts, and household items, thanks to its rigidity and versatility in molding and shaping.
