Alexei Volkov
Plastic is a synthetic polymer that can be moulded, extruded, or pressed into various solid forms. It is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. The production of plastic begins with the distillation of crude oil into lighter components called fractions, with naphtha being crucial for plastic production. Through polymerisation, these fractions are linked to form long polymer chains, resulting in the plastic resin known as polyethylene. However, bioplastics, a more recent development, are made from renewable biomass or bacteria, offering a biodegradable alternative to traditional plastics.
| Characteristics | Values |
|---|---|
| Base materials | Natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil |
| Bioplastics are made from renewable biomass, such as corn, cotton, or fish-skin waste and algae | |
| Fossil fuel-based petrochemicals like natural gas and petroleum are also used | |
| Types | LDPE, PE, Polyester, HDPE, PVC, LDE, PP, PS, PC, Bakelite, and more |
| Properties | Lightweight, durable, flexible, chemical-resistant, low toxicity, and low-cost production |
| Some types are reusable, while others produce hazardous materials after several uses | |
| Some are easily recyclable, while others have a very low recycling rate | |
| Concerns | Environmental concerns due to slow decomposition in natural ecosystems |
| Most plastic produced has not been reused or recycled, contributing to landfills and plastic pollution |
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What You'll Learn
Natural, organic materials like cellulose, coal, natural gas, salt, and crude oil
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil, a complex mixture of thousands of compounds, needs to be processed before it can be used to create plastic. The production of plastics begins with the distillation of crude oil in an oil refinery, which separates the heavy crude oil into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production.
Naphtha is a group of volatile mixtures of liquid hydrocarbons obtained by the distillation of crude oil. When naphtha is heated to a high temperature of around 800°C in a steam cracker, it splits into light hydrocarbons called olefins (including ethylene and propylene) and aromatics (including benzene, toluene, and xylene). These small molecules are then linked together to form long molecular chains called polymers, which are the basis of plastic.
Ethylene, a gaseous hydrocarbon, is a crucial monomer in the production of plastics. When subjected to heat, pressure, and a catalyst, ethylene joins together into long, repeating carbon chains, forming a plastic resin known as polyethylene (PE). PE-based plastics are processed in factories to create plastic pellets, which are melted into a thick liquid and cast into moulds.
While most plastics are produced from natural gas and petroleum, a growing minority are produced from renewable resources. Bioplastics, for example, are made from renewable biomass such as corn, cotton derivatives, or bacteria. While bioplastics may not always be a more sustainable alternative, they can be useful for creating biodegradable bottles and packaging films.
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Polymerisation and polycondensation
Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil, a complex mixture of thousands of compounds, is processed through distillation in an oil refinery, separating it into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production.
The two main processes for producing plastics are polymerisation and polycondensation, both requiring specific catalysts. Polymerisation involves linking monomers like ethylene and propylene to form long polymer chains. Polycondensation, on the other hand, is a stepwise reaction where molecules with complementary functional groups react to form polymers and release low-molecular-weight by-products like water, alcohols, or hydrogen chloride. This process is used to produce polymers from bifunctional or polyfunctional compounds (monomers).
Polycondensation can be homopolycondensation, with a minimum of two monomer types, or copolycondensation, with at least one extra monomer. Linear polycondensation occurs when only bifunctional compounds are involved, resulting in linear macromolecules. If molecules with three or more functional groups are used, three-dimensional structures are formed. Solution polycondensation is a favourable technique as it allows milder conditions, acts as a reaction catalyst, simplifies by-product removal, assures good heat transfer, and directly produces polymer solutions for manufacturing.
Polycondensation plays a crucial role in producing condensation polymers like polyesters, polyamides (such as nylon), polyacetals, and proteins. Polyesters, for example, are formed through the reaction of a carboxylic acid and an alcohol, with polyethyleneterephthalate (PET) being a common plastic example. Condensation polymers tend to be more biodegradable than addition polymers.
The versatility of polycondensation is further demonstrated in its use to create self-healing coatings and woven fibre-reinforced composites. Additionally, it is employed in the preparation of porous silica and PMOs through hydrolytic polycondensation of silane or precursors with silanol, chlorosilyl, or alkoxysilyl groups. This process has also facilitated the development of mesoporous silica films via the EISA technique.
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Bioplastics and biobased plastic
Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. The production of plastics involves the distillation of crude oil, separating it into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. Two main processes, polymerisation and polycondensation, are used to create plastics from monomers like ethylene and propylene, forming long polymer chains.
However, there are growing concerns about the environmental impact of plastics, particularly their contribution to climate change and waste management challenges. This has led to a focus on developing more sustainable alternatives, including bioplastics and biobased plastics.
Bioplastics are plastics manufactured from bio-based polymers, derived from biomass or renewable raw materials. They offer a more sustainable approach as part of a circular economy, potentially reducing the carbon footprint associated with traditional fossil-based plastics. Bioplastics like high-density polyethylene (HDPE) can be 100% biobased, containing renewable carbon, and play a crucial role in greenhouse gas reduction, especially when used for energy production. Additionally, drop-in bioplastics are chemically identical to fossil-fuel-based plastics but are made from renewable resources, making them easy to implement with existing infrastructure.
Biobased plastics, as the name suggests, are made fully or partially from biological resources rather than solely relying on fossil raw materials. They are not necessarily biodegradable or compostable, and their environmental benefits depend on their entire life cycle, including changes in land use. While biobased plastics can contribute to sustainability, careful consideration is needed to address potential trade-offs, such as agricultural impacts, competition with food production, end-of-life management, and higher costs.
The European Union (EU) has adopted a policy framework to address the sourcing, labelling, and use of biobased, biodegradable, and compostable plastics. This framework aims to improve understanding, provide guidance to stakeholders, and promote a shared understanding across the EU to ensure these plastics bring genuine environmental benefits. As of 2018, bioplastics represented approximately 2% of global plastics output, but with increasing research, investment, and scrutiny of fossil-based plastics, they are gaining traction in certain markets.
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Fossil fuels and petrochemicals
The production of plastics begins with the distillation of crude oil in an oil refinery, which separates heavy crude oil into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. Naphtha is a group of volatile mixtures of liquid hydrocarbons obtained by the distillation of crude oil. It is thermally decomposed at high temperatures of around 800°C in the presence of water vapour, splitting into light hydrocarbons called olefins (such as ethylene and propylene) and aromatics (such as benzene, toluene, and xylene). These small molecules are then linked together to form long molecular chains called polymers, which are the basis of plastic products.
The two main processes used to produce plastics from these starting materials are polymerisation and polycondensation, both of which require specific catalysts. In a polymerisation reactor, monomers such as ethylene and propylene are linked together to form long polymer chains. These polymers can then be moulded, extruded, cast into various shapes and films, or drawn into filaments for use in different applications.
While most plastics are produced from fossil fuel-based petrochemicals such as natural gas or petroleum, a growing minority are produced from renewable resources. Bioplastics, for example, are made from renewable biomass such as polylactic acid (PLA), which is derived from corn or cotton derivatives. They can also be made from bacteria, such as polyhydroxybutyrate (PHB), which is produced by the bacterium Bacillus megaterium when it consumes sugars.
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Plastic waste and recycling
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil, a complex mixture of thousands of compounds, is processed through distillation to separate it into lighter components, or fractions, which are then used in the production of plastics. Two key processes are used to produce plastics: polymerisation and polycondensation.
Plastic waste and its recycling are critical aspects of environmental sustainability and waste management. Plastic waste has severe impacts on the environment, health, and economy, with microplastics polluting oceans and entering the food chain. The plastic waste crisis has been a concern since the 1960s, but progress in addressing it has been slow, partly due to resistance from industries that profit from plastic production.
Recycling plastics is essential for creating a circular economy, reducing waste, and promoting sustainability. By reusing and recycling plastics instead of discarding them, we can conserve natural resources, save energy, and reduce greenhouse gas emissions, and create economic opportunities. However, the recycling process faces challenges due to the variety of plastic types and the complexity of some products.
Plastics are categorized into seven classes, each with unique properties and recycling considerations. Some plastics, like Polyethylene Terephthalate (PET) and High-Density Polyethylene (HDPE), are widely recycled, while others, like Polystyrene (PS) and Polycarbonate (PC), have low recycling rates and can leach hazardous materials under extreme conditions. Mixed-material items, such as products made from multiple types of plastics or a combination of plastics with other materials, pose additional recycling challenges as they cannot be processed in most facilities.
To improve recycling rates and effectiveness, it is crucial to educate individuals about proper waste sorting and recycling practices. Recycling labels on plastic packaging are designed to guide correct waste sorting, but these symbols can often be confusing. Understanding these labels helps avoid contamination in recycling bins and ensures plastics are recycled appropriately. Additionally, behavioral changes through incentives and broad participation in waste collection programs are essential steps toward creating a circular economy and reducing plastic pollution.
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Frequently asked questions
Plastic is made from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil.
There are dozens of different types of plastics, including LDPE, PE, Polyester, HDPE, PVC, LDE, PP, PS, PC, and more. Each type of plastic has different properties, some are easily recyclable, while others are not.
Most plastics are resistant to natural degradation processes and can persist in the environment for centuries. They can also contain toxic chemicals such as BPA, which has been linked to insulin resistance, inflammation, and heart disease.
Bioplastics are a potential alternative to traditional plastic. They are made from renewable biomass, such as corn, cotton, or bacteria. However, they may not be a more sustainable alternative in every case and can require specific waste streams for proper disposal.
