Omar Khalid
Plastic is a synthetic polymer that resists corrosion from environmental or chemical elements. It is a highly adaptable material that can be molded, extruded, or pressed into a diverse range of solid forms. This adaptability, combined with its low weight, durability, flexibility, chemical resistance, low toxicity, and low-cost production, has led to its widespread use around the world. Plastic consumption differs among countries and communities, with North America, China, and Western Europe accounting for the highest global consumption. While plastic has numerous benefits, it is important to consider its environmental impact, as plastic waste accumulating in oceans and ecosystems has become a growing concern.
| Characteristics | Values |
|---|---|
| Material | Synthetic or semi-synthetic |
| Composition | Polymers |
| Plasticity | Can be moulded, extruded, or pressed into solid forms |
| Other properties | Low weight, durability, flexibility, chemical resistance, low toxicity, and low-cost production |
| Production | Made from natural gas, petroleum, or renewable resources |
| Consumption | North America consumes 21% of global plastic, followed by China (20%) and Western Europe (18%) |
| Additives | Contain polymer stabilizers and other additives that may leach into the environment |
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What You'll Learn
Plastic is a synthetic polymer
Plastics are a specific type of synthetic or semi-synthetic polymer. They are made from molecules derived from oil, petroleum, or bio-based sources, which are combined to create different polymers. The first totally synthetic polymer, Bakelite, was produced in 1907. Synthetic polymers have become an integral part of the global economy, valued for their immense versatility and low production costs.
The terms "polymer" and "plastic" are often used interchangeably, but there are differences between the two. Polymers can be natural or synthetic, while plastics are synthetic polymeric materials derived from petroleum, crude oil, or natural gas. Plastics are a subset of polymers, so while all plastics are polymers, not all polymers are plastics.
Plastics are typically created through a polymerization or polycondensation process. In these processes, oil and natural gas are refined to form gases like ethane and propane. The produced ethane and propane are then heated to form monomers like ethylene and propylene. The monomers are mixed with a catalyst to form a polymer. This mixture is then extruded, cooled, and cut into pellets, which are shipped to plastics fabrication companies worldwide.
Plastics are known for their ability to be shaped when soft and then hardened to retain a given shape. They are also known for their low electrical conductivity and resistance to corrosion from environmental or chemical elements.
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Plastic is malleable
Plastic is a synthetic polymer that resists corrosion from environmental or chemical elements. It is composed primarily of polymers, with the vast majority of these polymers formed from chains of carbon atoms. The defining characteristic of plastic is its plasticity, which allows it to be moulded, extruded, or pressed into a diverse range of solid forms.
Plasticity, as a noun, refers to the deformability of the materials used in the manufacture of plastics. This deformability allows plastics to be moulded, extruded, or compressed into various shapes, including films, fibres, plates, tubes, bottles, and boxes. The plasticity of plastics also has a more technical definition in materials science, describing the non-reversible change in form of solid substances when subjected to external forces.
The malleability of plastics is a key aspect of their plasticity. Malleability refers to the ability of a substance to be modified in form or nature. Plastic materials are soft enough to be moulded, yet they can also harden into a desired fixed form. This makes plastics highly adaptable to a wide range of uses and allows sculptors and manufacturers to work with greater freedom.
The malleability of plastics also contributes to their durability and flexibility. Plastics can be heated and cooled multiple times without significant degradation, allowing them to retain their shape. This property is utilised in manufacturing processes such as thermoforming, where sheet plastic is heated and forced around a mould to create detailed parts.
Overall, the malleability of plastics is a crucial characteristic that enables their widespread use and versatility in various applications, from everyday objects to industrial components.
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Plastic is a growing pollutant
Plastic is a synthetic polymer that has revolutionised many industries, including medicine, aerospace, automotive, and clean drinking water systems. However, the exponential rise in plastic production and consumption has led to a significant environmental issue: plastic pollution.
Plastic pollution is a growing global problem that threatens the health of marine ecosystems and the food chain. Every year, about eight million tons of plastic waste escape into the oceans, with coastal nations contributing significantly to this issue. The impact of plastic pollution is most visible in developing Asian and African nations, where garbage collection systems are often inefficient or non-existent. However, developed countries, especially those with low recycling rates, also struggle to properly collect discarded plastics.
The mismanagement of plastic waste is a critical factor in plastic pollution. Mismanaged waste refers to plastic that is not recycled, incinerated, or disposed of in sealed landfills. Globally, around one-quarter to one-fifth of plastic waste is mismanaged, and this proportion varies across countries. Rich countries produce the most plastic waste per person, but the mismanagement of waste in low-to-middle-income countries contributes significantly to ocean plastic pollution. This is due to poorer waste management infrastructure in these nations.
Once plastic waste enters the ocean, it is carried by ocean currents and breaks down into smaller particles called microplastics. These microplastics have been found in every corner of the globe, from Mount Everest to the Mariana Trench, and are even present in municipal drinking water systems and the air we breathe. The presence of microplastics in the environment and the food chain has raised concerns about their potential impact on human health.
To address plastic pollution, a combination of improved waste management strategies, reduced plastic consumption, and effective recycling practices are necessary. While recycling is important, it does not fully address the issue, as plastic pollution arises from the improper disposal of plastic waste. Therefore, a global effort is required to implement sustainable waste management practices and reduce the environmental impact of plastic pollution.
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Plastic is used in plumbing
Plastic is used extensively in plumbing, with polyvinyl chloride (PVC) pipes being one of the most common types of plastic plumbing pipes. PVC pipes are affordable, durable, and long-lasting, with a lifespan of up to 70 years. They are also versatile and easy to work with, and their resistance to corrosion makes them a popular alternative to metal pipes. However, PVC pipes are not suitable for hot water lines as they can warp at temperatures above 140°F.
Another type of plastic plumbing pipe is Chlorinated Polyvinyl Chloride (CPVC), which is PVC treated with chlorine. This treatment increases the heat resistance of the pipes, making them suitable for hot water lines. CPVC pipes are also more durable and have a longer lifespan than standard PVC pipes, but they are slightly more costly.
Cross-linked Polyethylene (PEX) pipes are a newer type of plastic plumbing pipe that can be used for both hot and cold water lines. PEX pipes are generally colour-coded to help plumbers easily identify the hot and cold lines. While the lifespan of PEX pipes has not yet been determined, they are less recyclable than other plastic pipes, making them less environmentally friendly.
Acrylonitrile Butadiene Styrene (ABS) pipes are also used in plumbing, especially for vent and drain lines. ABS pipes are extremely strong, resistant to extreme weather conditions, and have a wide temperature range. They are also quicker to install than PVC pipes as they do not require priming before being joined together.
Plastic pipes are used in both industrial and residential plumbing systems worldwide due to their flexibility, long lifetime, reliability, and safety. They are also non-reactive, which means they do not corrode like metal pipes, and they are marked with colours and labels to indicate their diameter, pressure rating, and type of plastic.
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Plastic is made from natural gas and petroleum
Plastic is a synthetic polymer that is typically resistant to corrosion from environmental or chemical elements. It has low electrical conductivity. Today, most plastic is derived from hydrocarbons found in fossil fuels such as natural gas and petroleum, as well as coal.
Natural gas and petroleum are extracted from the earth and then refined to create useful chemicals, such as "monomers," which are the basic building blocks of polymers. In the refining process, crude oil is heated in a furnace and sent to a distillation unit, where heavy crude oil separates into lighter components called fractions. One of these fractions, naphtha, is a crucial compound in the production of plastic.
Petroleum, in particular, contains a high amount of propylene, which is heated with a catalyst to speed up the chemical reaction. This process causes the individual molecules of propylene to hook together, forming a polymer. The polymer formed from propylene is called polypropylene, meaning "many propylenes." The bonds between these molecules are very strong.
The production of plastic from natural gas and petroleum is a complex process that involves multiple steps and a range of chemical compounds. While natural gas and petroleum are major sources of feedstock for plastics production, it is worth noting that there are alternative methods of producing plastics, such as using bioplastics made by tiny living bacteria.
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Frequently asked questions
Plastic is a synthetic polymer that resists corrosion from environmental or chemical elements. It is a synthetic or semi-synthetic material composed primarily of polymers.
The defining characteristic of plastic is plasticity, which allows it to be moulded, extruded, or pressed into a diverse range of solid forms.
Some examples of plastic include polyvinyl chloride (PVC), epoxy, and bakelite.
