Alexei Volkov
Polymers and plastics are terms often used interchangeably, but they are not the same. Polymers are large macromolecules consisting of several units of monomers, while plastic is a specific type of polymer that has undergone processing. Simply put, plastics are made of polymers. Polymers can be natural or synthetic, with plastics being an example of the latter. They are formed through polymerization, where smaller molecules react to form long-chain macromolecules.
| Characteristics | Values |
|---|---|
| Definition | Polymers are large macromolecules consisting of several units of monomers. Plastic is a specific kind of polymer that has undergone processing. |
| Composition | Polymers are composed of smaller, uniform molecules. Plastics are comprised of a long chain of polymers. |
| Origin | Polymers may be natural or synthetic. Plastics are of synthetic origin. |
| Examples | Natural polymer examples include wool, cotton, and wood. Plastic is an example of a synthetic polymer. |
| Properties | Polymers have a different physical and chemical makeup than their monomers. Plastic is semi-organic and comes from oil or petroleum. |
| Processing | Polymers are formed by polymerization, where smaller molecules react to form long-chain macromolecules. Plastics undergo processing methods like injection molding. |
| Categories | Polymers are categorized into natural and synthetic types. Plastics are categorized into thermosetting and thermoplastic polymers. |
| Behavior | Polymers can be tailored to specific purposes. Thermosetting polymers solidify permanently, while thermoplastic polymers can be heated and remolded. |
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What You'll Learn
Plastic is a specific type of polymer
Polymers and plastics are encountered in everyday life and used for a variety of purposes. A large number of everyday household items are made of plastics and polymers. The key difference between the two is that plastic is a specific type of polymer. Plastics are made up of long chains of polymers, while polymers are composed of smaller, uniform molecules. Polymers are lengthy chain compounds made up of monomers. A monomer is a molecule that can be bonded to other identical molecules. Polymers are, therefore, enormous molecules made with a massive amount of smaller, identical molecules.
There are several types of polymers, including natural and synthetic polymers. Plastics are an example of the latter. They are strictly a product of the laboratory. Natural polymers include rubber, which is obtained from the latex tree, while plastics have no natural origin. Synthetic polymers can be further divided into three groups: elastomers, thermoplastics, and thermosetting polymers or thermosets. Elastomers, like rubber, are elastic materials characterised by weak molecular connections that allow for a high degree of deformation. Thermoplastics are distinguished from elastomers by their greater rigidity and ability to maintain their molecular structure when heated. They can be remoulded an unlimited number of times by heating and cooling. Thermosets, on the other hand, solidify into a permanent design and shape. Once set, they will burn rather than melt when exposed to high temperatures.
The different types of polymers have distinct advantages. Plastics, for example, can be engineered for specific properties and are well-suited for large-scale manufacturing. This makes them a key material in industries such as automotive, medical, electronics, and consumer goods. They are often processed using high-throughput methods like injection moulding. Other synthetic polymers, such as polyurethanes, are commonly used in plastic foams for thermal insulation and upholstery, as well as in paints and varnishes. Natural polymers also have important uses, such as wool for clothing and carbohydrates as a food source.
Overall, while polymers and plastics share many similarities, it is important to understand that plastic is a specific type of polymer with unique characteristics and applications.
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Polymers are naturally or synthetically occurring
Polymers are large molecules composed of many smaller, identical molecules known as monomers. They can be formed naturally or synthetically.
Natural Polymers
Natural polymers are organic compounds that occur in nature and can be extracted from sources such as microorganisms, algae, plants, or animals. They are often water-based. Examples include silk, wool, DNA, cellulose, proteins, polysaccharides, and bacterial polyesters. Natural polymers are biocompatible, biodegradable, bioactive, and similar to the extracellular matrix found in living tissues. They have been used in biomedical applications such as pharmaceuticals, tissue regeneration, drug delivery, and imaging.
Synthetic Polymers
Synthetic polymers are man-made and produced in a laboratory setting from hydrocarbon building blocks. Examples include nylon, polyethylene, polyester, Teflon, and epoxy. Polyurethane is also a common synthetic polymer. Synthetic polymers offer advantages such as tunable properties, endless forms, and established structures. They find applications in biomedical and environmental fields, such as tissue engineering and drug delivery. However, they may lack cell adhesion sites and require modifications to enhance cell adhesion.
Polymerization
Polymerization is the process of forming polymers through the interlinkage of monomers. Natural rubber, for instance, is a polymer made from isoprene units, while synthetic rubber can be made by polymerizing various monomers, including isoprene. Vulcanization is a chemical process used in the rubber industry to improve durability and chemical resistance by creating chemical bonds between individual polyisoprene chains.
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Plastics are semi-organic and synthetic
Polymers are large macromolecules consisting of several units of monomers. Monomers are molecules that can chemically bind to other molecules, usually identical ones, to form a long chain called a polymer. This process is called polymerization. Polymers can be natural or synthetic. Natural polymers include wool, cotton, and wood, while synthetic polymers include plastics.
Plastics are a type of synthetic polymer derived from oil or petroleum. They are created through polymerization reactions, specifically condensation and addition polymerization. The polymerization process involves hundreds or thousands of monomers aggregating and polymerizing to form larger molecules, which are plastics.
Plastics are semi-organic because they are synthetic polymers derived from natural materials, such as oil or petroleum. They are not entirely organic, as they are processed and engineered in a laboratory. The processing of plastics involves methods like injection molding, which allows for large-scale manufacturing and precision in creating various products.
The distinction between semi-organic and organic substances lies in their composition and origin. Organic substances are naturally occurring and composed of carbon-based compounds. In contrast, semi-organic substances like plastics are human-made and only partially derived from organic materials. The synthetic nature of plastics allows for specific properties, making them valuable in industries such as automotive, medical, electronics, and consumer goods.
Plastics can be categorized as thermoplastics or thermosets based on their behaviour when exposed to high temperatures. Thermoplastics maintain their molecular structure when heated and can be remolded multiple times. On the other hand, thermosets keep their shape even when heated and will burn rather than melt when exposed to high temperatures after setting.
In summary, plastics are semi-organic because they are synthetic polymers derived from natural materials through human processing. Their unique properties and adaptability make them a key material in various industries.
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Polymers are made of monomers
In the simplest terms, polymers are made of monomers. A monomer is a single atom, small molecule, or molecular fragment. When bonded together with identical or similar types of monomers, they form a larger molecule known as a polymer. The word monomer comes from the Greek "mono", meaning "one", and "meros", meaning "part". Monomers are like paperclips that can be bonded together in long chains. These chains can be linear, branched, or networked.
Polymers, on the other hand, are large molecules composed of smaller, uniform, and identical molecules called monomers. The word "polymer" itself comes from the Greek "poly", meaning "many", and "meros", meaning "part". So, a polymer is made up of many parts, or monomers.
There are two main types of polymers: addition polymers and condensation polymers. Addition polymers are formed when monomers form double bonds with carbon atoms. Condensation polymers are produced when two monomers are joined and a water molecule is removed.
Plastics are a specific type of polymer. They are semi-organic materials that come from oil or petroleum and have plasticity, meaning they can be moulded using heat. Plastics are produced by condensation and addition polymerization reactions.
The difference between monomers and polymers is that monomers are the necessary components that form polymers. Monomers bond together to form polymers during a chemical reaction called polymerization, where the molecules link together by sharing electrons. Different combinations of monomers in long polymer chains result in polymers with different properties, such as strength, durability, and flexibility.
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Plastics are classified as thermosetting or thermoplastic
Plastics are classified as either thermosetting or thermoplastic. Thermoplastics, as the name suggests, are plastics that respond to heat. They can be heated, cooled, and reshaped repeatedly without altering their chemical structure. Thermoplastics do not form any chemical bond when curing, making them remouldable and recyclable. Thermoplastics typically have low melting points, which means they can be easily remoulded or recycled.
Thermoplastics can be stored in the form of pellets before the moulding process. A thermoplastic polymer can be found in a wide range of applications, such as reusable plastic containers, ropes, carpets, piping systems, electrical cable insulation, and gas and liquid filters. One of the most popular thermoplastic parts produced is the LEGO brick.
Thermosetting plastics, on the other hand, are quite the opposite. They can withstand high temperatures and once hardened, they cannot be reformed or recycled even with the application of heat. Thermosetting plastics undergo a chemical change when heated, forming irreversible bonds that set their shape permanently. This process is irreversible, meaning once thermosets have been set, they cannot be melted or reshaped. Thermosets are typically hard and strong and have excellent resistance to heat and chemicals. Thermosetting plastics are commonly used in construction equipment panels, electrical housings, insulators, motor components, and disc brake pistons.
The critical difference between the two is that thermoplastics can be reheated, remoulded, and cooled as needed, whereas thermosets strengthen when cured but cannot be remoulded or heated after initial forming.
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Frequently asked questions
No, they are not the same, but plastics are a type of polymer.
Polymers are large macromolecules consisting of several units of monomers. They can be natural or synthetic.
Plastics are semi-organic materials that come from oil or petroleum. They are synthetic polymers.
Natural polymers include wool, cotton, and wood. Synthetic polymers include polyethylene, polythene, polystyrene, PVC, and other industrial-grade plastics.
Monomers are molecules that can chemically bind to other molecules, usually identical to themselves, to form long chains called polymers.
