Chloe Zhang
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. The term 'plastic' comes from the Greek 'plastikos' and the Latin 'plasticus', meaning 'fit for moulding' or 'capable of being moulded into various forms'. This refers to the material's malleability during manufacture, which allows it to be cast, pressed, or extruded into various shapes. Plastics are used in a wide range of products, from toys to vehicles, and contribute to sustainability by making items lighter and reducing fuel consumption during shipping. Today, most plastics are synthetic, derived from the processing of crude oil, but there is a growing demand for plastics made from renewable resources. In the future, plastics will increasingly be made from waste, renewable materials, and CO2.
| Characteristics | Values |
|---|---|
| Raw materials | Natural resources or synthetically created resources |
| Natural resources | Cellulose, coal, natural gas, salt, crude oil |
| Synthetic resources | Crude oil, natural gas, coal |
| Plastic type | Synthetic or biobased |
| Biobased sources | Carbohydrates, starch, vegetable fats and oils, bacteria, other biological substances |
| Chemical compounds | Carbon, hydrogen, oxygen, chlorine, nitrogen |
| Plastic production | Polymerisation, polycondensation |
| Plastic examples | Polystyrene, polyethylene, nylon, polyester, polyurethane |
| Plastic properties | Light, good insulator, hygienic, resistant to chemicals, high impact strength and flexibility, easy to handle |
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What You'll Learn
Natural vs synthetic plastics
The term 'plastic' comes from the Greek 'plastikos' and the Latin 'plasticus', meaning 'fit for moulding' or 'capable of being moulded into various forms'. Plastics are organic materials with a polymer structure, which can be derived from natural or synthetic sources.
Natural plastics have been used for a long time, with medieval craftsmen making lantern windows from translucent slices of animal horn, which is made of keratin, a carbon-nitrogen polymer. Natural rubber, derived from trees, is another example of a natural polymer. Natural rubber is biodegradable, unlike synthetic rubber, and its production does not contribute to deforestation. However, natural rubber is vulnerable to sunlight and tearing.
Synthetic plastics, on the other hand, are derived from fossil fuels, with the first being Bakelite, invented in 1907 by Leo Baekeland. Baekeland used phenol, an acid derived from coal tar, to create this revolutionary material. Synthetic plastics have the advantage of durability, but this is also a significant disadvantage, as they can persist in the environment for thousands of years without decomposing, causing pollution in oceans, rivers, and landfills.
Synthetic plastics are typically produced from petroleum, a non-renewable resource that has a negative impact on the planet when extracted. The production and disposal of synthetic plastics also contribute to greenhouse gas emissions. However, synthetic rubber is more resistant to sunlight and abrasion than natural rubber.
In conclusion, both natural and synthetic plastics have their strengths and weaknesses. Natural plastics are more environmentally friendly, but may be less durable and have different degradation factors than synthetic plastics. Synthetic plastics are more durable and resistant to certain types of degradation, but have a significantly negative impact on the environment due to their long decomposition times and the extraction of petroleum.
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Natural raw materials
Plastics are derived from natural, organic materials. They are formed by the transformation of large-molecule organic compounds formed by carbon, hydrogen, oxygen, chlorine, and nitrogen into their final state in different ways, such as injection, blow molding, and press drawing. The raw materials used to produce plastics are mostly found in the natural world and include:
- Cellulose: A natural polymer that is the structural component of plants. It is a crucial raw material for the production of biobased plastics.
- Coal: A natural, solid fuel that is composed of carbonized plant matter. It is used as a raw material for synthetic plastics.
- Natural Gas: A fossil fuel composed mainly of methane. It is a feedstock for the petrochemical industry, which uses it to produce synthetic plastics.
- Salt: Salt, or sodium chloride, is a natural mineral that can be extracted from the earth or seawater. It is used in small quantities in the production of some plastics.
- Crude Oil: A complex mixture of thousands of compounds, including hydrocarbons, which are processed to produce synthetic plastics.
The majority of plastic in use today is synthetic due to the ease of manufacturing methods involved in processing crude oil, coal, and natural gas. However, there is a growing demand for newer plastics made from renewable resources, driving the development of biobased plastics derived from carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances.
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Synthetic raw materials
Plastic is derived from synthetic or biobased raw materials. Synthetic plastics are created from natural gas, crude oil, or coal. These raw materials are extracted and distilled into naphtha, a crucial compound for plastic production. Steam cracking and catalytic cracking are two methods used to break down hydrocarbons into simpler molecules. The resulting monomers, such as ethylene and propylene, are linked through polymerisation to create polymers, which are the foundation of plastics.
The synthetic raw materials used in plastic production include natural gas, a significant feedstock in the petrochemical industry. Natural gas is composed of hydrocarbon chains, which are essential for forming plastics. Through distillation and cracking processes, natural gas is transformed into usable hydrocarbons.
Crude oil is another primary synthetic raw material for plastics. However, it requires processing before use. Crude oil is distilled into fractions, including naphtha, which is further processed through steam cracking or catalytic cracking to produce hydrocarbon monomers. These monomers are then linked to form polymers, the building blocks of plastic.
Coal, a fossil fuel, is also utilised as a synthetic raw material for plastic production. While it is less commonly used than natural gas and crude oil, coal contributes to the diverse range of synthetic resources used in plastics. The specific combinations of these synthetic raw materials and their processing methods determine the unique qualities of different types of plastics.
In addition to these traditional synthetic raw materials, there is a growing focus on utilising waste and renewable materials as feedstocks for plastic production. This shift aims to address the environmental concerns associated with the use of finite oil reserves and promote sustainability. By using waste biomass, animal waste products, and other renewable resources, the industry can reduce its reliance on non-renewable resources and contribute to a more circular economy.
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The polymerisation process
In a polymerisation reactor, ethylene and propylene monomers are subjected to heat, pressure, and catalysts, causing them to join into long, repeating carbon chains. This process creates a plastic resin known as polyethylene (PE). The PE is then processed by adding chemicals such as antioxidants and stabilisers before being converted into strings and pellets. These pellets are then melted and moulded into various final products.
The versatility of the polymerisation process lies in its ability to create different types of polymers with unique properties. By manipulating variables such as monomer types, comonomers, catalysts, and cooling media flow rates, manufacturers can control key quality parameters. For instance, polyethylene can be categorised based on its density, molecular weight, and linearity of molecules. Different grades of polyethylene offer varying physical properties like density, stiffness, flexibility, opacity, melting point, texture, and strength.
Additionally, there are two main types of polymerisation processes: addition polymerisation and condensation polymerisation. In addition polymerisation, monomers are added one at a time, forming chains of increasing length. Common examples of addition polymers include polyethylene, polystyrene, and polyvinyl chloride. On the other hand, condensation polymerisation involves joining two or more different monomers by removing small molecules like water. This process is known as step growth, where existing chains are added to other chains. Examples of condensation polymers include polyester and nylon.
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The future of plastic production
Sustainable Practices and Circular Economy
There is a growing emphasis on adopting sustainable practices in plastic production. This involves reducing the reliance on non-renewable resources and promoting the use of waste, biomass, and renewable raw materials. The concept of a circular economy is gaining traction, where plastics are processed, used, recycled, and reused, minimizing waste and maximizing resource efficiency. This approach not only reduces the environmental impact of plastic production but also contributes to a more sustainable and responsible use of resources.
Renewable and Alternative Raw Materials
The raw materials used in plastic production are evolving. While crude oil, natural gas, and coal have been traditional feedstocks for synthetic plastics, there is a shift towards renewable alternatives. Biobased plastics derived from carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances are becoming more prevalent. Additionally, advancements in technology are enabling the production of plastics from waste materials, CO2, and other sustainable sources. This transition to renewable raw materials is driven by the limited availability of oil reserves and the increasing demand for environmentally friendly alternatives.
Polymer Technology and Innovations
Polymers play a crucial role in the future of plastic production. Polymer technology offers the ability to recycle and re-circle plastics within the economy. Mechanical recycling involves melting and reshaping plastics into new items, while chemical recycling breaks down and reconnects polymers for reuse. These recycling processes are gaining momentum and support the idea of a circular economy. Additionally, advancements in polymer science may lead to the development of new polymers with enhanced properties, such as improved durability, biodegradability, or specialized functions for specific applications.
Environmental Impact and Regulatory Measures
The environmental impact of plastic production and waste management is a significant concern. As a result, regulatory bodies and organizations are implementing measures to reduce plastic waste and promote sustainable practices. This includes initiatives like the European Commission's Circular Plastics Alliance, which aims to foster a circular economy for plastics. Stringent regulations, incentives for sustainable practices, and the development of standards for plastic production and disposal methods may shape the future of the industry.
Consumer Awareness and Demand for Eco-Friendly Alternatives
Consumer awareness about the environmental impact of plastics is increasing. This has led to a growing demand for eco-friendly, biodegradable, and sustainable alternatives. Consumers are increasingly conscious of the products they use and their impact on the environment. This shift in consumer behavior is driving innovations in plastic production, encouraging companies to develop and market sustainable plastic products, and promoting the use of renewable raw materials.
In conclusion, the future of plastic production is likely to be characterized by sustainability, innovation, and a circular economy. With environmental concerns at the forefront, the industry is evolving to adopt more sustainable practices, utilize renewable raw materials, and explore alternative feedstocks. Technological advancements in polymer science and recycling processes will also play a pivotal role in shaping the future of plastic manufacturing, ensuring that plastics remain a versatile and valuable resource while minimizing their environmental footprint.
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Frequently asked questions
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt and crude oil.
Examples of monomers include ethylene, propylene, and butene.
Hydrocarbons include alkenes and alkanes, which can be created through steam cracking or catalytic cracking.
Synthetic plastics are derived from crude oil, natural gas, or coal. Biobased plastics are derived from renewable products such as carbohydrates, starch, vegetable fats and oils, and bacteria.
