Alexei Volkov
Plastic is a product derived from petroleum, which is a fossil fuel made from the natural decay of living organisms. The process of deriving plastic from petroleum involves heating it with a catalyst to form strong carbon-carbon bonds, resulting in polymers. These polymers are not abundant in nature, and microorganisms that break down biodegradable materials do not recognize these bonds. This is why plastics are hard to decompose. While some plastics can be broken down through photodegradation or with the use of catalysts, the process takes a long time, and the degradation of some plastic materials releases dangerous gases.
| Characteristics | Values |
|---|---|
| Plastics are derived from | Propylene, a simple chemical component of petroleum |
| Chemical bonds in plastics | Carbon-carbon bonds in polypropylene require too much energy to break down |
| Microorganisms that break down biodegradable materials | Don't recognize the bonds that hold polymers together |
| Plastic breakdown | Takes hundreds of thousands of years |
| Plastic breakdown methods | Heat, pressure, chemical additives, biological techniques |
| Plastic alternatives | Biodegradable plastic bags made from natural organic materials (e.g. corn) |
| Biodegradable products | Should break down into natural raw materials by microorganisms within a reasonable period |
| Compostable objects | Must be able to break down into natural elements (biodegrade) within a "reasonable composting environment" |
| Plastic degradation | Emits dangerous gases |
| Plastic bottles | Will begin to break down after 500-700 years |
| Plastic bags | Will begin to break down after 1000 years |
| Plastic breakdown acceleration | Use of catalysts to speed up oxidative degradation |
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What You'll Learn
- Plastic is derived from petroleum, a fossil fuel
- Carbon-carbon bonds in plastics require too much energy for nature to break down
- Plastics are not abundant in nature, so microorganisms cannot recognise them
- Some plastics only break down under high heat and specific conditions
- Some plastics emit dangerous gases when they break down
Plastic is derived from petroleum, a fossil fuel
Petroleum, or crude oil, is a key feedstock for the petrochemical industry, which uses it to produce the basic building blocks for making plastics. The process involves refining the oil to obtain petrochemical feedstock naphtha and other oils, which are then fed into petrochemical crackers that break them down into smaller molecules. These molecules, known as monomers, are then linked together through a process called polymerization to create polymers, which are thick, viscous substances used to make plastic products.
The connection between the fossil fuel and plastic industries is deep-rooted, with over 99% of plastic being made from chemicals sourced from fossil fuels. This reliance on fossil fuels for plastic production has significant environmental implications. As the world grapples with the plastic pollution crisis, the expansion of plastic production fueled by the shale gas boom in the United States further exacerbates the problem.
The challenge of plastic decomposition further underscores the impact of this relationship. Plastics are inherently difficult for bacteria to break down due to the complex molecular structure of polymers, which can contain 30 or more molecules of carbon, hydrogen, and/or oxygen. While some bacteria have evolved to directly break down plastic, the process of microbial evolution is slow, and the emergence of new species capable of digesting plastic takes time. As a result, plastic trash persists in the environment for extended periods, contributing to pollution and endangering ecosystems.
To address the issue of plastic waste, alternatives such as biodegradable plastics have been developed. These plastics use catalysts to speed up oxidative degradation, allowing oxygen in the atmosphere to break down the material. Compostable plastics, which require specific conditions like high heat to fully biodegrade, are also an option. However, the term "biodegradable" lacks a consistent definition, and the expansion of plastic production continues to outpace the implementation of solutions, underscoring the urgent need for comprehensive action to tackle plastic pollution.
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Carbon-carbon bonds in plastics require too much energy for nature to break down
Plastics are hard to decompose because they are made up of complex molecules that are not easily broken down by natural processes. Carbon-carbon bonds, or covalent bonds, in plastics are particularly difficult for nature to break down due to the large amount of energy required.
Carbon-carbon bonds are formed during the manufacturing process when propylene, a component of petroleum, is heated in the presence of a catalyst. This process results in the formation of extremely strong carbon-carbon bonds, creating long chains of monomers called polypropylene. These bonds are essential in giving plastic its durability and stability.
However, the same bonds that make plastic so durable also make it challenging for natural processes to break down. Organisms, including bacteria, fungi, and plants, typically break down organic matter through metabolic pathways. But carbon-carbon bonds are not part of these natural metabolic processes, as they require too much energy for organisms to synthesize. Instead, organisms find it easier to synthesize peptide bonds, which link carbon to nitrogen and are found in proteins and other organic molecules.
While the use of peptide bonds in plastic manufacturing could make the resulting plastic biodegradable, it would also shorten the shelf life of the product. This trade-off between biodegradability and product longevity presents a challenge for manufacturers, especially for products intended for long-term use.
The complexity of plastic molecules also contributes to the difficulty of decomposition. Polymers, the major material in plastics, can be too large for the active site of an enzyme, preventing any reaction from taking place. Additionally, plastic molecules are very stable, meaning they are resistant to breaking down into other molecules.
Overall, the high energy requirement for breaking carbon-carbon bonds, along with the complexity and stability of plastic molecules, makes plastics particularly challenging for nature to decompose.
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Plastics are not abundant in nature, so microorganisms cannot recognise them
Plastics are derived from petroleum, a fossil fuel made from the remains of ancient living organisms. During the process of making plastic, individual molecules of propylene, a chemical found in petroleum, are heated and linked together by strong carbon-carbon bonds. This results in polymers, long chains of monomers, that form the plastic material.
The problem with plastics lies in these chemical bonds. Plastics are not abundant in nature, and the enzymes in microorganisms that break down biodegradable materials cannot recognize the bonds that hold polymers together. These materials are called "xenobiotic". Microorganisms have evolved over billions of years to break down certain types of bonds that are common in nature, such as polysaccharides, but they struggle with the unique structure of plastics.
The inability of microorganisms to recognize and break down plastic has significant environmental implications. Plastic trash can persist in the environment for hundreds or even thousands of years, releasing harmful chemicals and breaking into microplastics that can be ingested by animals, fish, and birds.
While some biodegradable plastics are available, such as hydro-biodegradable plastics (HBP) and oxo-biodegradable plastics (OBP), they are not a perfect solution. These plastics use a catalyst to speed up oxidative degradation, but they may not be made from non-toxic sources, and their biodegradability is not always guaranteed.
Additionally, some bacteria have been found to directly break down plastic bags, but this is attributed to a stroke of luck where an existing mechanism can be adapted to break down a new molecule. This process of microevolution can take a significant amount of time, and until a species of bacteria emerges or is developed, the degradation of plastic relies on scarce, random mutations in individual bacteria.
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Some plastics only break down under high heat and specific conditions
The decomposition of plastics is a complex and challenging process due to their chemical composition and the presence of additives. While some plastics can be degraded through processes like photodegradation, certain plastics require very specific conditions, including high heat, to break down fully.
Plastics are designed to be durable, and this inherent quality makes them resistant to degradation. High temperatures can, however, affect their structural integrity. When exposed to high heat, plastics tend to soften and lose stiffness, becoming more prone to cracking, chipping, and breaking. This effect is known as thermal degradation, and the rate of degradation is directly proportional to the temperature and duration of exposure.
Some plastics, known as thermoplastics, become molten when heated and can be reshaped. Thermoplastics gain their heat resistance from their molecular structure, particularly the presence of rigid aromatic rings in their backbone chain. However, even with this structure, thermoplastics will distort if exposed to temperatures beyond their operational range.
Additionally, there are heat-resistant plastics designed for high-performance applications. These plastics, such as polybenzimidazole (PBI), exhibit exceptional heat resistance, strength, and stability. PBI, for instance, has no known melting point and can withstand extremely high temperatures, making it ideal for critical applications like astronaut spacesuits and firefighter protective gear.
The challenge with heat-resistant plastics lies in their manufacturing complexity and cost. PBI, for instance, is incredibly expensive and difficult to produce, requiring diamond tools for machining. This highlights the trade-off between the benefits of heat resistance and the practical considerations of cost and production feasibility.
In summary, while some plastics can break down under high heat, the specific conditions required and the inherent durability of plastics contribute to the overall challenge of plastic decomposition. The development of heat-resistant plastics showcases the potential for specialized applications, but it also underscores the need for careful consideration of environmental impacts and the exploration of alternative solutions, such as biodegradable plastics.
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Some plastics emit dangerous gases when they break down
Plastic is derived from fossil fuels, including natural gas and crude oil, and is designed to be durable. While plastic does not fully decompose, it can break down into smaller pieces called microplastics through biodegradation or exposure to the sun, heat, or water. These microplastics are found everywhere on Earth and pose a serious threat to wildlife and human health.
The process of refining and producing plastic emits vast amounts of greenhouse gases, contributing to climate change. Additionally, as plastics decay, they emit traces of methane and ethylene, which are powerful greenhouse gases. The rate of emission increases over time and is significantly higher when plastic is exposed to air compared to water. Low-density polyethylene, a common type of plastic, is a significant emitter of these gases.
The degradation of plastic not only affects its chemical integrity but also results in the fragmentation of polymers, increasing the surface area exposed to the elements. This fragmentation process can release toxic chemicals, adversely affecting the environment and human health. For example, the additive bisphenol-A, used in many plastic products, can leach out as plastics age, producing hydrocarbon gases during high-temperature decomposition.
Some plastics are designed to be biodegradable, incorporating catalysts to speed up oxidative degradation. However, the term "biodegradable" lacks a clear and widely accepted definition, and even compostable plastics often require specific industrial-scale conditions to fully biodegrade. The best way to reduce the impact of single-use plastics on the environment and human health is to transition towards reusable alternatives and reduce plastic consumption.
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Frequently asked questions
Plastic is made from petroleum, which is derived from the natural decay of once-living organisms. The process involves heating propylene with a catalyst, creating extremely strong carbon-carbon bonds. These bonds are not accessible to bacteria in nature, and therefore, there are no naturally occurring organisms that can break them down effectively.
Plastic bottles will begin to break down after 500-700 years, and plastic bags will take around 1000 years.
There are various methods to accelerate the degradation of plastics, including heat, pressure, chemical additives, and biological techniques. Additionally, there are degradable plastics available, such as hydro-biodegradable plastics (HBP) and oxo-biodegradable plastics (OBP), which use catalysts to speed up oxidative degradation.
