Maya Ellison
Plastic is a synthetic or semi-synthetic polymeric material that is valued for its durability, flexibility, low cost, and ease of production. It is derived from petroleum products, with around 5-8% of the world's oil production being consumed for plastic creation. The versatility of plastic is due to its plasticity, which allows it to be moulded, extruded, or pressed into various solid forms. Plastic is not sold in its pure form but is mixed with additives like stabilizers, plasticizers, and dyes to enhance its lifespan, workability, and appearance. The wide range of plastic types includes polyethylene, polypropylene, polyvinyl chloride (PVC), and polystyrene, each with unique physical properties and applications.
| Characteristics | Values |
|---|---|
| Composition | Synthetic or semi-synthetic materials composed primarily of polymers |
| Production | 9.2 billion metric tons of plastic produced between 1950 and 2017, with over 400 million metric tons produced in 2023 alone |
| Sources | Derived from petroleum products, natural gas, cellulose, starch, and renewable resources like polylactic acid |
| Additives | Stabilizers, plasticizers, dyes, and other types of plastic |
| Types | Commodity plastics, specialty resins, thermoplastics, thermosetting polymers, microplastics, and more |
| Properties | Low density, low electrical conductivity, transparency, toughness, durability, flexibility, chemical resistance, low toxicity, lightweight, inexpensive, versatile, impact-resistant, shatter-resistant, recyclable |
| Uses | Beverage bottles, food containers, packaging, hoses, insulating food containers, shatterproof windows, automobile parts, biomedical devices, aviation parts, textiles, construction, electronics, healthcare equipment, and more |
| Issues | Additives in recycled products can lead to inconsistent properties and discolouration |
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What You'll Learn
Plastic is a synthetic or semi-synthetic material
Plastics are created through polymerisation, where small molecules (monomers) combine to form long chains (polymers). The polymers are then melted and blended to make formulations for plastics, which are transformed into finished or semi-finished products through extrusion or moulding processes. While all plastics are synthetic materials due to their ability to be moulded, the category of synthetic materials also includes other materials such as certain types of rubber or fibres, which are not considered plastics.
The versatility of plastics, combined with their low weight, durability, flexibility, chemical resistance, low toxicity, and low-cost production, has led to their widespread use around the world. Plastics are used in a wide variety of applications, from packaging and bottles to medical devices and automotive parts. However, plastics can also pose environmental challenges, such as the need for recycling and the risk of pollution, especially in aquatic and marine ecosystems.
The development of plastics has evolved from the use of naturally plastic materials, such as gums and shellac, to the chemical modification of these materials, and finally to completely synthetic plastics. Early plastics were bio-derived materials such as egg and blood proteins, while the first fully synthetic plastic, Bakelite, was invented in 1907. Today, most plastics are produced from natural gas and petroleum, but a growing minority are made from renewable resources.
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Plastic is made from petrochemicals, cellulose or starch
Plastic is a polymeric material that can be moulded or shaped when heat and pressure are applied. The process of making plastic involves the distillation of crude oil in an oil refinery. Crude oil is a complex mixture of thousands of compounds, including hydrocarbons, solids, and gaseous hydrocarbons. During distillation, the oil is heated in a furnace, and the resulting vapour is fed into a fractional distillation tower, where it is separated into different compartments or fractions based on weight and boiling point. One of these fractions, naphtha, is crucial for plastic production. The distillation step converts long-chain hydrocarbons into simpler hydrocarbons, which can then be turned into chemicals for preparing plastics. This process is known as cracking, and it involves high temperatures and pressures to break down complex hydrocarbons.
Plastics are derived from natural, organic materials, and historically, the first plastics were bioplastics made from natural substances like cellulose or starch. Cellulose, for instance, can become thermoplastic when extensively modified, though it is rarely used due to its high cost. Starch-based bioplastics, on the other hand, are widely used and blended with biodegradable polyesters to create compostable materials for industrial applications. These blends have a lower carbon footprint than petroleum-based plastics. Additionally, thermoplastic starch is the most common bioplastic, constituting about 50% of the bioplastics market.
Today, synthetic plastics are predominantly derived from petrochemicals, such as crude oil, natural gas, or coal. However, bioplastics are gaining renewed interest in the context of a bioeconomy and circular economy. Bioplastics are made from renewable resources and can be chemically identical to their fossil-fuel counterparts. For example, soy proteins have been used in plastic production for over a century, and soy protein is being reconsidered as a source of bioplastic. Bioplastics based on starch and polylactic acid (PLA) were the commercially most important types in 2022, constituting approximately 2% of global plastic output.
The distinction between synthetic and bio-based plastics is becoming blurred as conventional petro-based polymers are blended with bioplastics to create "bio-attributed" or "mass-balanced" plastic products. This evolution in plastic production offers opportunities for more sustainable practices and a reduction in the reliance on fossil-based plastics. However, it is important to note that the biodegradability of bioplastics depends on their chemical structure, and not all bioplastics are easily degradable in the environment.
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Plastic is a polymer, made from many monomer-repeating units
Plastic is a synthetic or semisynthetic material composed primarily of polymers. It is a polymeric material that has the capability of being moulded or shaped, usually by the application of heat and pressure. The term polymer is derived from the Greek words 'poly', meaning 'many', and 'mer', meaning 'repeating unit'. Thus, a polymer is made from many monomer-repeating units.
Polymers, whether artificial or natural, are made of repeating chains of smaller chemical units. These chains comprise many repeating units formed from monomers. Each polymer chain consists of several thousand repeating units. The backbone is the part of the chain that links together a large number of repeat units. The monomer is the distinct piece of each repeating unit that is incorporated into the polymer. Synthetic polymers are generally created through step-growth polymerization or chain polymerization. In the former, chains of monomers may combine with one another, as seen in polyester. In the latter, monomers are added to the chain one at a time, as in polystyrene.
The main ingredient in most plastic materials is a derivative of crude oil and natural gas. However, a growing minority are produced from renewable resources like polylactic acid. Plastic is not sold as a pure substance but is mixed with additives like stabilizers, plasticizers, and dyes. These additives are added to improve the lifespan, workability, or appearance of the final product. The majority of products are made from thermosoftening materials, which require melting to mix in the additives. Thermosetting polymers, on the other hand, melt and take shape only once, permanently solidifying after.
Plastics can be classified by their chemical synthesis, physical properties, and reactions to various substances. They are also classified by their engineering behaviour, encompassing qualities relevant to manufacturing or product design. Important groups include acrylics, polyesters, silicones, polyurethanes, and halogenated plastics. The properties of plastics can be customized by attaching different molecular groups called side chains to the backbone. These side chains influence the polymer's characteristics, such as flexibility, elasticity, and toughness.
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Plastic is recyclable, but additives can cause issues
Plastic is a synthetic or semisynthetic polymeric material that is known for its plasticity, which allows it to be moulded, extruded, or pressed into various solid forms. It is primarily derived from crude oil and natural gas, with an increasing amount being produced from renewable resources.
While plastic is technically recyclable, the additives used during its production present significant challenges and issues in the recycling process. Additives are chemicals or materials added to plastic during compounding to improve its lifespan, workability, or appearance. These additives include stabilizers, plasticizers, dyes, and even different types of plastic to form polymer blends.
The issue arises because these additives are difficult to remove during the recycling process, and they often end up in the new recycled products. Plastic waste, even if sorted by polymer type and colour, will still contain varying types and amounts of additives. Mixing these recycled plastics together can result in a material with inconsistent properties, which may be undesirable for certain industries.
Furthermore, some additives have been associated with negative health and environmental impacts. Certain additives have been identified as endocrine disruptors and have been linked to various diseases, including cancer, obesity, and reproductive disorders. Phthalates, for example, are a family of plasticizers commonly used in PVC production, and they have been associated with endocrine disruption and developmental issues.
The release of additives from plastics into the environment is also a concern, as they can contaminate soil, air, water, and food. This has led to efforts in restricting the use of toxic additives, seeking eco-friendly alternatives, and establishing guidelines for the use of plastic additives to protect human and ecological health.
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Plastic is used in healthcare, aviation, automotive and more
Plastic is a polymeric material that can be moulded or shaped using heat and pressure. This property of plasticity, often coupled with other characteristics such as low density, low electrical conductivity, transparency, and toughness, allows plastics to be used in a wide range of applications.
Healthcare
The use of plastics in healthcare is a topic of debate due to its environmental impact. Plastic products, including gloves, tubing, and blood sample tubes, are among the largest contributors to carbon emissions in the healthcare sector. Studies have estimated that plastics account for around 30% of all healthcare waste, with significant variation between countries. The UK's National Health Service, for example, is estimated to dispose of 133,000 tonnes of plastic annually. Reducing plastic usage in healthcare aligns with the principles of sustainable clinical practice, and some measures, such as reducing unnecessary packaging and using alternative materials, are being explored.
Aviation
Plastic is considered the material of the future in the aerospace industry. Its strength, lightweight nature, and resistance to thermal expansion make it ideal for various aircraft applications. Acrylic and polycarbonate plastics, for instance, are used in airplane interior parts and exteriors due to their durability and ability to withstand extreme temperatures. Plastic components also reduce the weight of the plane, making it more economical and fuel-efficient. From wiring conduits to bushings and bearings, plastics are found in many aircraft parts, contributing to its growing importance in aviation.
Automotive
The automotive industry also extensively uses plastic, particularly in car interiors. Polypropylene, a thermoplastic polymer, is the most frequently used plastic in automotive manufacturing due to its formability, excellent chemical and heat resistance, and impact resistance. It is commonly found in car bumpers, gas cans, and carpet fibres. Polyvinyl chloride (PVC), known for its flame retardant properties, is used in dashboards and automotive body parts. Polycarbonate, another impact-resistant plastic, is used in car bumpers and headlight lenses due to its lightweight and weathering resistance properties.
Plastics have become integral to these industries due to their unique properties and versatility, contributing to advancements in healthcare, aviation, and automotive fields.
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Frequently asked questions
Plastic is a synthetic or semi-synthetic material that is derived from petrochemicals or things like cellulose and starch. It is composed primarily of polymers, which are long chains of molecules that can be moulded using methods like extrusion or injection moulding.
Polymers are the main ingredients in most plastic materials. They are long chains of molecules, formed by linking small molecules together. Not all polymers are plastics.
There are many different types of plastics, including:
- Polyethylene (PE)
- Polypropylene (PP)
- Polyvinyl chloride (PVC)
- Polystyrene (PS)
- Polyethylene terephthalate (PET)
- Polycarbonate
- Thermoplastics
- Thermosetting polymers
Plastic is a versatile material with many properties, including:
- Durability
- Low cost
- Ease of production
- Flexibility
- Low weight
- Chemical resistance
- Low toxicity
