Sofia Martinez
Plastics are a group of materials that are either synthetic or naturally occurring and can be molded or shaped when soft, then hardened to retain that shape. The study of plastics involves understanding their chemical composition, properties, and impact on the environment. Plastics are polymers, which come from the Greek words poly, meaning many, and meros, meaning parts or units. Polymers are long chains of molecules that can be natural or synthetic. Synthetic polymers are made from plentiful carbon atoms derived from petroleum and other fossil fuels. The first synthetic polymer was invented in 1869 by John Wesley Hyatt, who treated cellulose derived from cotton fiber with camphor to create a plastic that could be crafted into various shapes. Today, the plastics industry is one of the fastest-growing industries globally, with synthetic polymers in plastic form being widely used.
| Characteristics | Values |
|---|---|
| Name of the study of plastics | Polymer science and engineering |
| What are plastics? | A group of materials, either synthetic or naturally occurring, that may be shaped when soft and then hardened to retain the given shape. |
| What are polymers? | Polymers are substances made of many repeating units. The word comes from the Greek "poly" (many) and "meros" (parts or units). |
| Plastic's chemical composition | Plastics can be divided into two categories based on chemical composition: polymers with only aliphatic (linear) carbon atoms in their backbone chains and heterochain polymers, which contain atoms like oxygen, nitrogen, or sulfur in their backbone chains, in addition to carbon. |
| Plastic's environmental impact | Plastic contributed 1.8 billion tons of CO2 to the atmosphere in 2019, or 3.4% of global emissions. By 2060, this could increase to 4.3 billion tons of greenhouse gas emissions per year. |
| Plastic's health impact | Some plastic products degrade into chemicals with estrogenic activity, such as bisphenol A (BPA), which has been linked to increased body weight in animal offspring and insulin resistance. |
| Plastic's persistence in the environment | Plastic in the ocean is persisting due to increased volume, but recent studies show it is decomposing faster than previously thought due to exposure to sun, rain, and other environmental conditions. |
| Plastic's recyclability | Plastic recycling is important but challenging; if not properly recycled, plastics can become mixed with other chemicals and difficult to recycle, becoming a source of pollution. |
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What You'll Learn
Plasticity and moulding
Plastic is a polymeric material that can be moulded or shaped. This property of plasticity, in combination with other properties such as low density, low electrical conductivity, transparency, and toughness, allows plastics to be used in a wide range of applications.
Plastics are synthetic or naturally occurring materials that can be shaped when soft and then hardened to retain a given shape. The word polymer comes from the Greek words "poly", meaning many, and "meros", meaning parts or units. A polymer can be thought of as a chain in which each link is a "mer" or monomer (single unit). The process of polymerization involves joining at least 1,000 links together.
The raw material for manufacturing plastic products is called a resin. Some common resins include polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS). These resins are often used in packaging.
Plastic moulding is the process of pouring liquid plastic into a container or mould so that it hardens in a customized shape. There are several types of plastic moulding, including extrusion moulding, compression moulding, blow moulding, injection moulding, and rotational moulding.
Extrusion moulding involves pressing hot melted plastic through a shaped hole, known as a die, to create a length-shaped plastic part. Blow moulding involves inflating a heated plastic mass, usually in the shape of a tube (called a parison), with air until it fills the mould and conforms to its shape. Injection moulding involves melting plastic and injecting it directly into a custom mould. Compression moulding involves placing heated plastic inside a heated mould and then closing it to compress the plastic into the desired shape.
Rotational moulding, also called rotomolding, is a process where a powder or liquid resin is placed into a metal mould and rotated in an oven until the resin coats the inside of the mould. The constant rotation creates centrifugal force, forming even-walled products. Once the mould cools, the hardened plastic is removed. This process is commonly used to make large hollow plastic products, such as bulk containers, storage tanks, car parts, and marine buoys.
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Environmental impact
The study of plastics is a complex and evolving field that encompasses various scientific and environmental disciplines. While plastics have revolutionised numerous industries, their environmental impact has emerged as a critical area of concern, driving research and innovation in sustainable alternatives and waste management.
Plastics are synthetic polymers derived from natural materials like cellulose and latex or synthetic substances like polyethylene and polyvinyl chloride. They are renowned for their malleability, allowing them to be moulded into various products. However, this very versatility has led to their pervasive use and subsequent environmental challenges.
The environmental impact of plastics is extensive and far-reaching. Plastic pollution has infiltrated natural and built environments, from the Antarctic tundra to coral reefs and even our food chains. This pollution persists for extended periods, with decomposition rates ranging from 50 years for a plastic cup to an astonishing 600 years for fishing line. Recent studies indicate that ocean plastics decompose faster than initially believed due to exposure to environmental factors, but the sheer volume of plastic waste has counteracted this, resulting in a net slowdown in decomposition.
The insidious nature of plastic pollution extends beyond its longevity. As plastics degrade, they release toxic chemicals like bisphenol A (BPA), an endocrine disruptor linked to increased body weight in animal offspring and insulin resistance, which can lead to inflammation and heart disease. Microplastics, plastic particles smaller than five millimetres, and nanoplastics, smaller than one micrometer, infiltrate ecosystems and pose risks to marine life, which may ingest them or become entangled or suffocated by plastic waste. Over 1,500 species in marine and terrestrial environments are known to ingest plastics, highlighting the urgency of addressing this issue.
Additionally, plastics contribute significantly to greenhouse gas emissions. In 2019, plastic waste emitted 1.8 billion tons of carbon dioxide (CO2) equivalents, accounting for 3.4% of global emissions. By 2060, this figure is projected to more than double, reaching 4.3 billion tons per year. The production of plastics from fossil fuels exacerbates emissions, and the energy used in their manufacturing is often unsustainable. However, it is important to note that a 2024 study suggested that plastic packaging might have a less detrimental effect on the environment compared to glass or aluminium, underscoring the complex trade-offs involved in addressing plastic waste.
The environmental impact of plastics demands urgent attention and holistic solutions. While plastic pollution poses significant risks, the pervasive use of plastics in various industries cannot be overlooked. Balancing the benefits of plastics with their environmental consequences is a complex challenge that requires innovative approaches to waste management, product design, and sustainable alternatives. Addressing plastic pollution necessitates a multifaceted approach that considers not only the ecological but also the social, economic, and health implications of this ubiquitous material.
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Health concerns
The study of plastics is called polymer science, and while plastics have become an essential part of modern life, they also pose significant health risks.
Plastics are a wide range of synthetic or semisynthetic materials composed primarily of polymers, which are long chains of molecules. Their defining characteristic is plasticity, which allows them to be moulded, extruded, or pressed into various solid forms. This adaptability, combined with other desirable properties such as low weight, durability, flexibility, and low cost, has led to their widespread use.
However, the production and disposal of plastics have severe consequences for human, plant, and animal health. The process of creating plastics contributes to greenhouse gas emissions, and the plastic waste itself clogs our land, air, and waterways. The toxic chemical additives used in plastic production have been linked to a range of health issues. These include cancers, lung disease, birth defects, infertility, obesity, diabetes, thyroid problems, and immune system suppression.
Microplastics, which are formed when plastics break down, carry these toxic chemicals and can be ingested through food and water or inhaled from the air. They have been detected in human breast milk, raising alarms about their presence in our bodies. These microplastics damage cells and act as vessels for pathogens, increasing the spread of disease.
Bisphenol A (BPA), a common chemical in plastic, is an endocrine disruptor that can increase body weight and lead to insulin resistance, inflammation, and heart disease. The health impacts of plastics are not limited to direct exposure but also include environmental injustice, as marginalized communities near plastic plants experience higher rates of cancer.
The growing awareness of these health concerns has sparked calls for action, such as the petition for the US to join the Global Plastics Treaty, which aims to end the production and sale of single-use plastics and hold producers accountable for environmental and health-related damages.
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Degradation and disposal
The study of plastics is called polymer science or plastics engineering, and it involves understanding the chemical and physical properties of polymers, which are large molecules composed of repeating structural units. Now, for the requested paragraphs on degradation and disposal:
Chemical degradation is another approach, utilizing chemical reactions to break down the polymer chains. Oxidation, for example, can be employed to degrade plastics, as it involves the reaction of polymers with oxygen, leading to a reduction in molecular weight and changes in the material's properties. Other chemical processes include hydrolysis, where the polymer reacts with water, and solvolysis, which involves the use of solvents to break down the polymer chains. A more environmentally friendly method is biological degradation, which harnesses the power of microorganisms such as bacteria and fungi to degrade plastics naturally. This process can be optimized through controlled environments and the selection of specific microorganisms to efficiently break down particular types of plastics.
The disposal of plastics is a critical environmental concern due to the persistence of these materials in the environment. Landfills are a common method of plastic waste disposal, but this practice has led to significant environmental issues, including soil and water contamination. Incineration is another disposal method, but it contributes to air pollution and the release of toxic gases if not properly controlled. A more sustainable approach is the recycling of plastics, which involves collecting, sorting, and reprocessing plastic waste into new products. Recycling helps reduce the environmental impact of plastic waste and conserves resources, but it also has limitations, such as the energy intensity of the process and the challenge of separating and cleaning different types of plastics.
To mitigate the environmental impact of plastic disposal, efforts are being made to develop biodegradable plastics and improve recycling technologies. Biodegradable plastics are designed to naturally break down over time, reducing the persistence of plastic waste in the environment. However, the development of these materials must balance biodegradability with the desired mechanical and physical properties for specific applications. Additionally, advancements in recycling technologies, such as chemical recycling, which breaks down plastics into their chemical building blocks for reuse, hold promise for more efficient and sustainable plastic waste management.
The responsible degradation and disposal of plastics is a complex challenge that requires a multifaceted approach. While mechanical, chemical, and biological degradation methods offer potential solutions, the optimal approach depends on the specific type of plastic and the environmental context. Furthermore, the development of biodegradable plastics and improved recycling technologies are crucial steps towards minimizing the environmental footprint of plastic materials. Through continued research and innovation in these areas, polymer scientists strive to create a more sustainable future, ensuring the benefits of plastics are balanced with responsible environmental stewardship.
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History and development
The study of plastics is called polymer science or, more specifically, polymer chemistry.
The development of plastics started with natural materials that exhibited plastic properties, such as shellac and chewing gum. The word "plastic" comes from the Ancient Greek πλαστικός (plastikos), meaning "capable of being shaped or molded." The word polymer, which means "of many parts," comes from the Greek words "poly," meaning "many," and "meros," meaning "parts" or "units."
The next step in the evolution of plastics involved the chemical modification of natural materials such as rubber, nitrocellulose, collagen, and galalite. In the 19th century, natural polymers such as cellulose and latex were first chemically modified to form celluloid and vulcanized rubber. The first semi-synthetic resin was discovered by Charles Goodyear, who discovered vulcanized rubber.
In 1855, Alexander Parkes invented Parkesine, one of the earliest examples of a completely synthetic material that we would recognize as modern plastic. However, the first fully synthetic plastic, containing no molecules found in nature, was Bakelite, invented in 1907 by Leo Baekeland, who coined the term "plastics." This discovery was revolutionary, as it meant human manufacturing was no longer constrained by the limits of nature.
The first synthetic polymer was invented in 1869 by John Wesley Hyatt, who treated cellulose derived from cotton fiber with camphor to create a plastic that could be crafted into various shapes and imitate natural substances. The first semisynthetic fiber, rayon, was developed from cellulose in 1911, but it wasn't until World War II, when natural sources became difficult to obtain, that synthetics were mass-produced. Synthetic rubber was needed for tires, and nylon was required as a replacement for silk in parachutes.
Since then, plastics have become an essential part of our lives, with a wide range of uses, including packaging, building and construction, automobiles, furniture, and toys. The success and dominance of plastics since the early 20th century have brought major benefits to mankind, from medical devices to lightweight construction materials. However, plastics are also the basis of widespread environmental concerns due to their slow decomposition rate in natural ecosystems.
Plastics are produced in chemical plants by the polymerization of their starting materials (monomers), which are almost always derived from petroleum or natural gas. Despite this, plastic production is not particularly monopolized, with about 100 companies accounting for 90% of global production. Historically, Europe and North America dominated global plastics production, but since 2010, Asia has emerged as a significant producer, with China accounting for the largest share of production.
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Frequently asked questions
The study of plastics falls under the field of polymer science, or polymerology.
Polymers are substances made of many repeating units, or "parts", which is what the word "polymer" means in Greek. Plastics are polymers that can be moulded or shaped when soft and then hardened to retain the given shape.
Natural polymers include tar, shellac, cellulose, latex, and amber. Synthetic polymers include polyethylene, polystyrene, and acrylic.
Plastics are made from synthetic polymers, which are usually derived from carbon atoms provided by petroleum and other fossil fuels.
