Chloe Zhang
Plastic is a synthetic or semisynthetic material composed primarily of polymers. Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, and, most commonly, crude oil. The production of plastics involves the distillation of crude oil into fractions, with naphtha being crucial for plastic production. Polymerisation and polycondensation processes are then used to create various types of plastics with unique properties. These processes involve linking monomers to form long polymer chains, resulting in materials with characteristics such as low weight, durability, and flexibility. The versatility and adaptability of plastics have led to their widespread use in products ranging from packaging to construction materials. However, the environmental impact of plastic waste and the slow decomposition rate in natural ecosystems have raised concerns. Initiatives promoting recycling, waste management, and the development of biodegradable or renewable alternatives aim to address these issues.
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What You'll Learn
- Natural materials: cellulose, coal, natural gas, salt, and crude oil
- Synthetic materials: polylactic acid, nylon, and silicone
- Polymerisation: linking monomers to form long polymer chains
- Polycondensation: joining monomers by removing small molecules
- Plasticity: the ability to be moulded, extruded, or pressed
Natural materials: cellulose, coal, natural gas, salt, and crude oil
Plastics are derived from natural, organic materials. The process of making plastic involves polymerisation or polycondensation. Some of the natural materials that are used to make plastic include cellulose, coal, natural gas, salt, and crude oil.
Cellulose
Cellulose is a natural material that is found in plants, bacteria, and algae. It is a major constituent of paper, paperboard, and card stock. Cellulose can be converted into cellophane, a thin transparent film. It is also used to make hydrophilic and highly absorbent sponges. Cellulose is the raw material in the manufacture of nitrocellulose (cellulose nitrate), which is used in smokeless gunpowder. Additionally, cellulose derivatives are used in the pharmaceutical industry as fillers, stabilizers, and thickening agents.
Coal
Coal is a combustible sedimentary rock that is composed mainly of carbon and hydrocarbons. It is formed over millions of years from the remains of plants that were subjected to high pressure and heat. Coal is classified into four main types: anthracite, bituminous, subbituminous, and lignite, depending on the amount of carbon and heat energy it contains. Coal is used as a fuel source for electricity generation and as a raw material for the production of steel and other industrial processes.
Natural Gas
Natural gas is a naturally occurring compound composed primarily of methane, with small amounts of other hydrocarbons and gases. It is formed from the thermal decomposition of organic matter, mainly marine microorganisms, under oxygen-free conditions over millions of years. Natural gas is used as a fuel for industrial heating and cooking, and it is also used in the manufacture of fabrics, glass, steel, plastics, and other products.
Salt
Salt, or sodium chloride, is a naturally occurring mineral with diverse uses. While it is commonly associated with food as a preservative and flavouring agent, most of the world's salt production is used in agriculture, water treatment, chemical production, and industrial processes. Salt is used in the production of PVC, paper pulp, soaps, and glycerine, among other inorganic and organic compounds.
Crude Oil
Crude oil, also known as petroleum, is a naturally occurring liquid mixture of hydrocarbons. It is formed from the anaerobic decay of organic materials, mainly plankton and algae, over millions of years. Crude oil needs to be processed before it can be used, and this typically involves distillation to separate it into fractions of lighter components. One of these fractions, naphtha, is crucial for plastic production. Crude oil has been used for various purposes throughout history, including as a fuel for weapons, paving material, and lamp oil.
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Synthetic materials: polylactic acid, nylon, and silicone
Synthetic polymers are typically derived from petroleum oil and are composed of carbon-carbon bonds. They are formed by applying heat and pressure in the presence of a catalyst, which alters the chemical bonds that hold monomers together, causing them to bond with one another. Synthetic polymers can be categorised as thermoplastics, thermosets, elastomers, and synthetic fibres.
Polylactic Acid
Polylactic acid, also known as poly(lactic acid) or polylactide (PLA), is a thermoplastic polyester. It is obtained by the condensation of lactic acid with a loss of water, or by the ring-opening polymerisation of lactide. PLA is a popular material due to its cost-effective production from renewable resources, such as fermented plant starch, and its potential for use in compostable products. It is the most widely used plastic filament material in FDM 3D printing due to its low melting point, high strength, low thermal expansion, and good layer adhesion. However, it has poor heat resistance unless annealed. PLA is also used in drug delivery systems due to its safety, biocompatibility, biodegradability, and applicability.
Nylon
Nylon is a synthetic polyamide that can be produced through the polymerisation of two or more different monomers. It is a common example of a condensation polymer, along with polyester. Nylon is widely used in various applications, including in products like toys, phones, vehicles, and homes.
Silicone
Silicone, or polysiloxane, is a synthetic polymer that can be produced from silicon atoms along with carbon. It is a heat-resistant resin commonly used as a sealant, for high-temperature cooking utensils, and as a base resin for industrial paints. The production of silicon and semiconductors for modern electronic equipment is highly energy-consuming, requiring 29.2 to 29.8 kWh/lb of energy.
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Polymerisation: linking monomers to form long polymer chains
The process of polymerisation involves linking monomers to form long polymer chains. Plastics are composed of polymers, which are large molecules formed by linking chains of molecules called monomers. Monomers are the basic building blocks of polymers and are derived from raw materials such as crude oil and natural gas. Crude oil, a complex mixture of thousands of compounds, undergoes distillation to separate it into lighter fractions, with naphtha being crucial for plastic production.
During polymerisation, monomers like ethylene and propylene are linked together in a reactor to create long polymer chains. This process requires specific catalysts to facilitate the reaction between monomers. The resulting polymers are still not in the form of plastic but exist as granules, powders, or liquids. To become usable plastic, they undergo transformations such as kneading, heating, melting, and cooling into various shapes and sizes.
An example of polymerisation is the formation of polyethylene (PE). Initiators are added to start the chain reaction, and after the formation of PE, it undergoes processing with the addition of chemicals like antioxidants and stabilisers. An extruder then converts the PE into strings, which are ground into PE pellets. These pellets are melted and moulded into the final plastic products.
The versatility of polymerisation allows for the creation of different types of plastics with unique properties. For instance, polyethylene is widely used in product packaging, while polyvinyl chloride (PVC) is used in construction and pipes due to its strength and durability. Additionally, UHMWPE, a type of polyethylene, exhibits excellent abrasion resistance due to the extreme length of its polymer chains. It is used in military body armour, hydraulic seals, and medical devices.
Polymerisation also enables the production of plastics from renewable resources. With growing concerns about the environmental impact of plastic waste, there is a shift towards using waste biomass, animal waste products, and renewable raw materials as feedstock for plastic production. This circular economy for plastics aims to minimise waste and promote the reuse and recycling of plastic materials.
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Polycondensation: joining monomers by removing small molecules
Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, crude oil, and even waste biomass or animal waste. Crude oil, a complex mixture of thousands of compounds, is the most common source, and it needs to be processed before it can be used. This processing involves distillation, which separates the heavy crude oil into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production.
Two main processes are used to produce plastics: polymerisation and polycondensation. This answer will focus on the polycondensation process, specifically the aspect of "joining monomers by removing small molecules."
Polycondensation involves joining two or more different monomers (the basic building blocks of polymers) by removing small molecules such as water. This process, also known as condensation polymerisation, requires a catalyst for the reaction to occur between adjacent monomers. This process is called step growth because it involves adding monomers to an existing chain. Common examples of condensation polymers include polyester and nylon.
During polycondensation, monomers such as ethylene and propylene are linked together to form long polymer chains. These chains are then kneaded, heated, melted, and cooled into objects of various shapes, sizes, and colours. Initiators are added to start the chain reaction, and chemicals such as antioxidants and stabilisers are included. The polymer is then converted into strings and then into pellets, which are melted into the final plastic products.
The versatility of polycondensation and other plastic-making processes has led to the widespread use of plastics. Plastics are used in a diverse range of applications, from toys and phones to vehicles and construction materials. However, the massive use of plastic since the 1950s has also led to significant environmental concerns due to plastic waste and slow decomposition rates.
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Plasticity: the ability to be moulded, extruded, or pressed
Plasticity is the property that allows materials to be irreversibly deformed without breaking. It is a defining characteristic of plastics, which are composed of polymers formed by linking chains of molecules called monomers. The plasticity of polymers allows them to be moulded, extruded, or pressed into various shapes, such as pipes, bottles, boxes, cartons, and films. This versatility, combined with their low weight, durability, flexibility, chemical resistance, low toxicity, and low-cost production, has led to the widespread use of plastics around the world.
The process of creating plastics involves extracting and refining raw materials, primarily natural gas and crude oil, to obtain the necessary monomers. These monomers are then linked together through polymerisation or polycondensation processes, forming long polymer chains. The polymers that result from these processes are still not in the form of plastic and must undergo further transformations. They are kneaded, heated, melted, and cooled to create objects with specific shapes, sizes, colours, and properties.
The plasticity of a polymer depends on its ability to withstand the temperature and pressure during the moulding process without breaking. By varying different parameters, such as using different elements, changing monomer types, and rearranging their patterns, the shape, molecular weight, and other chemical and physical properties of the polymer can be altered. This tunability allows for the creation of plastics with specific characteristics suited to their intended applications.
While most plastics are currently produced from natural gas and petroleum, there is a growing trend towards using renewable resources, such as waste biomass, animal waste products, and polylactic acid. This shift aims to address the environmental concerns associated with plastic waste and the limited availability of oil reserves. Initiatives like the Circular Plastics Alliance in Europe promote a circular economy for plastics, where they are processed, used, reused, collected, and recycled back into base materials to minimise waste.
Plastics have had a significant impact on various industries since the early 20th century, offering benefits such as lightweight construction materials and medical devices. However, their slow decomposition rate in natural ecosystems has led to widespread environmental concerns, particularly regarding microplastics and marine plastic pollution. Efforts to address these issues include reducing plastic packaging, increasing recycling, and developing more sustainable packaging materials.
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Frequently asked questions
Plastics are made from natural, organic materials such as cellulose, coal, natural gas, salt and, most commonly, crude oil.
There are dozens of different types of plastics, including:
- Polyethylene (PE)
- Polyvinyl chloride (PVC)
- Polypropylene (PP)
- Polystyrene (PS)
- Polyethylene terephthalate (PET)
- Bakelite
- Acrylic
The process of making plastics involves the distillation of crude oil into lighter components, called fractions. One of these fractions, naphtha, is crucial for plastic production. The two main processes used to produce plastics are polymerisation and polycondensation. In polymerisation, monomers such as ethylene and propylene are linked together to form long polymer chains.
Plastics have slow decomposition rates in natural ecosystems, leading to concerns about plastic waste generation and pollution. Particular attention has been given to the issue of marine plastic pollution and microplastics. However, initiatives are in place to promote a circular economy for plastics, with an emphasis on recycling and the use of renewable, biodegradable materials.
