Alexei Volkov
Plastics and polymers are two terms that are often used interchangeably, but they are not the same thing. While all plastics are polymers, not all polymers are plastics. Polymers are natural or synthetic compounds composed of long chains of chemically bonded molecules or monomers. Plastics are a specific type of synthetic or semi-synthetic polymer, typically derived from oil, with a large molecular mass and a linear structure.
| Characteristics | Values |
|---|---|
| Definition | Polymers are natural or synthetic chemical compounds composed of repeating chains of molecules or monomers. Plastics are a specific type of synthetic or semi-synthetic polymer, made from molecules derived from oil, petroleum, or bio-based sources. |
| Composition | Polymers are composed of uniform molecules that are smaller than plastic molecules. |
| Examples | Natural polymers include silk, wool, DNA, cellulose, proteins, and rubber. Synthetic polymers include nylon, polyethylene, polyester, and epoxy. Common plastics include polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC). |
| Properties | Polymers are flexible and can be tailored for specific purposes. Plastics have low electrical and thermal conductivity and high strength-to-weight ratios. |
| Recyclability | Polymers can be recycled and reused, while plastics pose end-of-life recycling and disposal issues due to their non-biodegradable nature. |
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What You'll Learn
Plastic is a type of synthetic polymer
The terms "polymer" and "plastic" are often used interchangeably, but they are not the same thing. A polymer is a natural or synthetic chemical compound composed of repeating chains of large, chemically bonded molecules, or monomers. Polymers can be naturally occurring, such as cellulose, latex, wool, silk, DNA, and rubber, or synthetic, such as nylon, polyethylene, and polypropylene.
Plastic, on the other hand, is a specific type of synthetic or semi-synthetic polymer. It is a hydrocarbon-based polymeric material derived from crude oil, natural gas, or bio-based sources. The first synthetic plastic, Bakelite, was created in 1909 for telephone and electrical components. Plastics are a subset of polymers, meaning that while all plastics are polymers, not all polymers are plastics.
Plastics are created through condensation and addition polymerization reactions. They are classified as either thermosetting polymers or thermoplastic polymers. Thermosetting polymers, also known as thermoset polymers, solidify into a permanent design and shape. An example is an epoxy resin used in two-part adhesives. Thermoplastic polymers, on the other hand, are one-dimensional chains that can be melted and remolded repeatedly. The majority of manufactured polymers are thermoplastics, which is why they can be recycled and reused.
Plastics have several advantages over polymers, including low production costs, high strength-to-weight ratios, and the ability to be produced in large quantities quickly. However, they also have downsides, such as their negative environmental impact due to their difficulty in breaking down and recycling. Efforts are currently underway to address this issue by developing environmentally friendly polymers using biodegradable biocomposites.
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Polymers are natural or synthetic
Polymers are chemical compounds composed of very large molecules called macromolecules, which are multiples of simpler chemical units called monomers. Polymers are formed when these monomers chemically combine to create a larger network of connected molecules. They can be found in many materials in the universe, from proteins and nucleic acids in organisms to minerals like quartz and diamond, to synthetic materials like plastics, paper, and rubbers.
Polymers can be natural or synthetic. Natural polymers are those that occur as a result of natural or biological processes and can be found in nature, including in animals, plants, and even in the human body in the form of proteins, fats, amino acids, starch, and cellulose. They are also found in other organisms such as bacteria. Natural rubber, for instance, is a natural polymer found in rubber trees.
Synthetic polymers, on the other hand, are created in laboratories or factories by humans using artificial means. They are not found naturally. Synthetic polymers are produced using several chemical reactions and can be further categorized based on their method of production and the components used. Some common examples of synthetic polymers include PVC, acrylic, Teflon, nylon, polyethylene, polyester, and polythene.
Plastics are a specific type of synthetic or semi-synthetic polymer with a large molecular mass and a mostly linear structure. They are typically made from oil, petroleum, or bio-based sources and have a wide range of durability. The first synthetic plastic was created in 1909 and was known as Bakelite.
While the terms "polymer" and "plastic" are often used interchangeably, they are not the same. Polymers are a broader category that includes both natural and synthetic substances, while plastics are a subset of synthetic polymers with distinct characteristics.
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Plastic is derived from crude oil and natural gas
While the terms "polymer" and "plastic" are often used interchangeably, they are not the same thing. Polymers are chemical compounds composed of repeating chains of molecules or monomers. These monomers can be simple, comprised of a few atoms, or be complex functional groups of atoms. The chemical composition and size of the individual monomers determine how the polymer interacts with itself and its environment. Polymers can be naturally occurring, such as cellulose, latex, and rubber, or synthetic, like nylon, polyethylene, and polypropylene.
Plastics, on the other hand, are a specific type of synthetic or semi-synthetic polymer derived from crude oil and natural gas. They are made from molecules derived from oil, petroleum, or bio-based sources, which are combined to create different polymers. The first synthetic plastic was created in 1909 for telephone and electrical components and was known as Bakelite.
Crude oil and natural gas are fossil fuels that serve as the principal sources of carbon for modern plastic. These hydrocarbons are the earliest raw materials of plastic, ready-made by the Earth. The process of extracting these fossil fuels is complex and involves drilling and pumping them to the surface from high-pressure chambers within the Earth's crust. The dense sludge is then carried through pipelines to oil refineries.
At the refineries, crude oil and natural gas are processed and broken down into different sources of hydrocarbons, which are used to make plastic. The specific amounts and origins of these feedstocks used in plastic manufacturing are often challenging to determine due to the flexibility in the feedstock consumed by the petrochemical industry.
In addition to crude oil and natural gas, synthetic plastics can also be derived from coal. On the other hand, bio-based plastics are made from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. While bio-based plastics are considered more environmentally friendly, they may not always be biodegradable and can persist in the environment.
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Polymers are made of monomers
Polymers are large molecules or macromolecules composed of repeating chains of individual atoms or molecules. These molecules are known as monomers. The process by which monomers link together into a polymer chain is known as polymerization. Monomers are single atoms, small molecules, or molecular fragments that, when bonded together with identical or similar types of monomers, form a larger macromolecule known as a polymer.
Monomers can be simple, comprising a few atoms, or complex functional groups of atoms. They can be natural or synthetic. The monomers found in many plastics include organic compounds. The word monomer comes from the Greek "mono", meaning "one", and "meros", meaning "part". The prefix in monomer implies that monomers are single, simpler basic units that are less important individually but, when combined, form a greater complex structure.
The chemical composition and size of the individual monomers determine how the polymer interacts with itself and its surrounding environment. Different combinations of monomers in long polymer chains result in polymers with different properties, such as strength, durability, and flexibility. For example, a polymer with a pattern of one silver paperclip followed by one red paperclip repeated in a long chain will be different from a polymer with a different pattern or different types of paperclips.
The repeating units in polymers are often carbon and hydrogen, and sometimes oxygen, nitrogen, sulfur, chlorine, fluorine, phosphorus, and silicon. The first synthetic plastic was created in 1909 for telephone and electrical components and was known as Bakelite.
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Plastic is a polymer but not all polymers are plastics
The terms "polymer" and "plastic" are often used interchangeably, but they are not the same thing. A polymer is a natural or synthetic chemical compound composed of repeating chains of large, chemically bonded molecules called monomers. These monomers can be simple, made up of a few atoms, or complex groups of atoms. Polymers are found in many materials, from proteins and nucleic acids in organisms to minerals like quartz and diamond, and synthetic materials like plastics, paper, and rubbers.
Plastics are a specific type of synthetic or semi-synthetic polymer, typically made from oil, natural gas, or bio-based sources. They are derived from hydrocarbon-based polymeric materials and are a subset of polymers. Plastics have a high strength-to-weight ratio and low electrical and thermal conductivity. They are also flexible and durable, making them suitable for a wide range of applications, from shopping bags to construction materials.
While all plastics are polymers, not all polymers are plastics. Polymers can be naturally occurring, such as cellulose, latex, wool, silk, and rubber, or synthetic, like nylon, polyethylene, and polypropylene. They can also vary in strength and flexibility, depending on their chemical composition.
The distinction between polymers and plastics lies in their chemical composition and structure. Polymers are composed of smaller, uniform molecules, while plastics are made up of long chains of polymers. The unique properties of polymers, such as their strength and flexibility, can be tailored to suit specific purposes, making them a versatile material for various applications.
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Frequently asked questions
No, they are not the same thing. Polymers are chemical compounds made up of long chains of smaller molecules called monomers. Plastics are a specific type of polymer made up of long, branched molecules called polymers.
Polymers can be natural or synthetic. Wool, cotton, silk, DNA, and wood are examples of natural polymers. Synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy.
There are seven main types of plastics, with polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) being the most common. Plastic toys, toothbrushes, bins, and bottles are typical examples of consumer goods made of plastics.
Polymers are used in a wide range of applications due to their versatility and low production costs. They are used in the fabrication industry, medicine, agriculture, and more. Plastics are used in everyday household items and consumer goods. They are also used in medical devices and implants.
