Chloe Zhang
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. Plastics are known for their ability to be molded, extruded, or pressed into solid objects of various shapes. However, not all polymers are plastics. Polymers are vast molecules formed by repeating units known as monomers, and they can be either natural or synthetic. The distinction between plastics and polymers is important, especially for those involved in the research, design, and production of these materials. While plastics are a subset of synthetic polymers, polymers have a much wider range of applications, from the fabric of our clothes to our DNA.
| Characteristics | Values |
|---|---|
| Definition | Polymers are the main ingredient in plastics, which are a wide range of synthetic or semi-synthetic materials. |
| Composition | Plastics are composed of chains of polymers. Synthetic polymers are derived from oil, petroleum, or bio-based sources. |
| Types | There are hundreds of types of plastic, including thermoplastics and thermosetting polymers. The three most common types of plastic are polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC). |
| Uses | Plastics are known for their ability to be molded, extruded, or pressed into solid objects of various shapes. They are used in product packaging, construction, pipes, laboratory equipment, automotive parts, medical devices, and more. |
| Recycling | Plastics can be recycled through mechanical or chemical processes, but not all plastics are easily recyclable. The recyclability of plastic types depends on how they are made. |
| Environmental Impact | Synthetic polymers present a significant environmental challenge due to their reliance on petrochemical products, which contribute to rising global temperatures. However, bio-based polymers are being developed as more sustainable alternatives. |
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What You'll Learn
Synthetic polymers
Polymers are chemical compounds composed of repeating chains of individual atoms or molecules. They can be naturally occurring, such as cellulose, latex, and rubber, or synthetic, like nylon, polyethylene, and polypropylene. The terms "polymer" and "plastic" are often used interchangeably, but not all polymers are plastics. Plastics are a specific type of synthetic or semi-synthetic polymer derived from petroleum or bio-based sources.
- Nylons: Found in textiles and fabrics.
- Teflon: Used in non-stick pans.
- Bakelite: Used for electrical switches.
- Polyvinyl chloride (PVC): Found in pipes and construction materials.
- Polyethylene: Used in shopping bags, cling film, and hydraulic seals.
- Polypropylene: Found in laboratory equipment, automotive parts, and medical devices.
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Non-plastic polymers
While plastic is the most common type of polymer, not all polymers are plastics. Polymers are large molecules composed of repeating subunits, which are usually derived from petroleum. Plastics are polymers that are moulded into shape when they are soft, and which become hard and unmouldable upon cooling.
There are hundreds of types of plastic, but only a handful that humans interact with regularly. Some types of plastic are reusable, while others are not due to the chemicals they contain. Similarly, some can be recycled, while others need to be disposed of in alternative ways. Plastics are sorted according to their resin type, either manually or using mechanised automated processes, or even by colour. The two main ways to recycle plastic are mechanical recycling, where plastic is washed, ground, and melted, and chemical recycling, where plastic is broken down into monomers to form new polymers.
There are eight common types of synthetic organic polymers found in households, including nylons in textiles and fabrics, Teflon in non-stick pans, Bakelite for electrical switches, and polyvinyl chloride (PVC) in pipes. Common PET bottles are made of a synthetic polymer, polyethylene terephthalate, while plastic kits and covers are made of synthetic polymers like polythene, and tires are made from polybutadienes.
Due to the environmental issues created by these synthetic polymers, which are mostly non-biodegradable and derived from petroleum, alternatives like bioplastics are being considered. Bio-based polymers generated from renewable sources have benefits over traditional plastics, including reduced CO2 emissions, increased biodegradability, and less dependence on fossil fuels. However, bioplastics are currently more expensive than synthetic polymers.
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Plastic recycling
There are hundreds of types of plastics, also called polymers, but only a handful are commonly used. The recyclability of plastic varies depending on its type and how it was made. For example, thermoset plastics contain polymers that form irreversible chemical bonds and cannot be recycled, while thermoplastics can be remelted and remodelled. Some commonly recycled plastics include PET and HDPE, which are used in plastic bottles.
Before recycling, plastics are sorted according to their resin type, either manually or using mechanized automated processes, or even by colour. There are two main ways to recycle plastic: mechanical recycling and chemical recycling. Mechanical recycling involves washing, grinding, and melting the plastic, while chemical recycling breaks down the plastic into monomers to form new polymers for reuse. Feedstock recycling, a type of chemical recycling, converts waste plastic into its starting chemicals, which can be used to create fresh plastic. However, this process involves higher energy and capital costs.
While plastic recycling can be beneficial, it also faces challenges. Recycling plastic is generally more costly than creating new plastic, and the plastic industry has been criticized for lobbying for expansion despite research showing that most plastic could not be economically recycled. Additionally, not all plastics are widely recycled, and certain plastic products, such as those with the #7 recycling code, are not typically recyclable.
To optimize the lifespan of plastics, many local authorities are offering collections for mixed plastics packaging and providing recycling services for various materials. It is important for individuals to properly sort their trash and recycle or repurpose their plastic waste to contribute to environmental conservation and reduce plastic pollution.
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Plastic alternatives
The search for alternatives to plastic is driven by the desire to find solutions that are less harmful to the environment and human health. While plastic is widely used due to its low cost, ease of production, and versatility, it contributes significantly to waste and pollution. Here are some alternatives to plastic that are being explored:
Reusable and Refillable Packaging
The simplest and least environmentally damaging alternative to plastic is to promote reusable and refillable packaging. This approach reduces the need for single-use plastics and encourages consumers to bring their own containers or utilize refillable options. Reusable packaging can be made from a variety of materials, such as glass, metal, or plant-based bioplastics.
Bioplastics and Compostable Plastics
Bioplastics, derived from plant sources, are considered a greener alternative to fossil fuel-based plastics, especially for food packaging. Some specific types of bioplastics include PLA (polylactic acid) and PHA (polyhydroxyalkanoates). PHA, produced through bacterial fermentation, is biodegradable and can be composted at home or industrially. However, it is important to note that not all bioplastics are recyclable, and proper disposal methods are crucial.
Algae-Based Plastics
Algae-based plastics are gaining attention as a promising alternative to traditional plastics. Algae are easy and inexpensive to farm, and they can be used to create materials with similar properties to plastic without the negative environmental impact. Companies like B'zeos and Notpla are already utilizing seaweed to develop sustainable packaging, cutlery, and compostable containers.
Silicone
Silicone shares many physical characteristics with plastic but is considered safer and more environmentally friendly. It is made from naturally occurring silica stone, water, and natural gas-derived methanol. Silicone is strong, flexible, and capable of withstanding extreme temperatures. It does not leach toxic residues or microplastics, making it an excellent alternative for kitchen products and medical implants. However, silicone recycling capabilities are limited, and not all facilities can accept and recycle silicone products.
Natural Fibers and Sustainable Coatings
Natural fibers such as coconut fiber, hemp, husk, oat hulls, cotton burs, and jute are being explored as alternatives to plastic packaging and shipping materials. Additionally, researchers have developed a biodegradable spray-on coating made from plant cellulose to preserve produce and other food items, which could eliminate the need for plastic packaging for fruits, vegetables, and meat.
While there is no single magic solution to replace plastic, a combination of these alternatives, along with a shift in consumer habits and behavior, can help reduce our dependence on single-use plastics and mitigate their environmental impact.
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Plastic production
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. The first step in the plastics manufacturing process is material preparation, which involves the extraction and refinement of these raw materials. Crude oil, for instance, is distilled in an oil refinery to separate it into groups of lighter components called fractions, one of which, naphtha, is crucial for plastic production. The raw materials are then processed to produce monomers, which are the building blocks of plastics.
The next step is polymerization, where monomers are chemically bonded together to form polymers, large, chain-like molecules. This process can occur through polymerisation or polycondensation, and both require specific catalysts. There are several methods of polymerization, including addition polymerization, condensation polymerization, and copolymerization. Once the polymerization process is complete, additives such as plasticizers, stabilizers, flame retardants, and colorants are incorporated to enhance the properties of the plastic.
Following polymerization and the addition of additives, the plastic is then molded into shape. Several molding techniques are used, including injection molding, blow molding, rotational molding, and extrusion. The choice of technique depends on the type of plastic, the complexity of the part, and the production volume. Injection molding, for example, is suitable for high-volume production of complex parts, while extrusion is ideal for creating long, continuous shapes.
The final stage in the plastics manufacturing process is finishing, which involves any post-processing steps needed to achieve the desired appearance and performance of the part. Finishing processes can include cutting, drilling, painting, printing, and coating. The type of finishing process depends on the requirements of the final product. For instance, a plastic part used in a car might need to be painted to match the vehicle's colour, while a plastic bottle might require printing for branding and labelling.
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Frequently asked questions
Yes, not all polymers are plastics. Polymers are vast molecules formed by repeating units known as monomers. They can be either natural or synthetic, and they have a wide range of applications, from the fabric of our clothes to DNA. Plastics, on the other hand, are a specific type of synthetic or semi-synthetic polymer derived from natural gas, petroleum, or bio-based sources.
Some examples of non-plastic polymers include nylon, Teflon, and epoxy. Additionally, Thordon produces high-quality polymers for various applications, such as elastomer bearings and specialty components.
Distinguishing between polymers and plastics is crucial because it highlights the diversity and capabilities of polymers beyond just plastics. Plastics face significant environmental challenges due to their production methods and disposal, contributing to rising global temperatures and ecosystem harm. Understanding the differences can help drive the development and deployment of plastic alternatives, improving waste management and reducing environmental impact.
