Sofia Martinez
Plastics are made up of large molecules called polymers, which are formed by the reaction and linking of small molecules called monomers. Monomers are the foundational building blocks of plastics, and manufacturers can manipulate the mechanical properties of the plastic by altering the type and amount of monomers used. Some common monomers used in plastic production include ethylene, propylene, vinyl chloride, styrene, acrylic, and tetrafluoroethylene. These monomers are used to produce common plastics such as polyethylene, polypropylene, polyvinyl chloride, and polystyrene.
| Characteristics | Values |
|---|---|
| Definition | Monomers are the tiny, powerful building blocks of plastics |
| Plastic Manufacturing Process | Monomers react and link together to form long strands known as polymer chains |
| Plastic Structure | The polymer chains give plastic materials their unique structure, which can be linear, branched, or cross-linked |
| Polymer Chains | The length and configuration of these chains determine the material’s mechanical and physical attributes |
| Plastic Properties | By altering the type and amount of monomers used, manufacturers can manipulate the mechanical properties of the plastic |
| Monomer Size | Monomers with larger molecular weights generally produce stronger and more rigid materials, while smaller monomers contribute to flexibility |
| Examples of Monomers | Ethylene, propylene, vinyl chloride, styrene, acrylic, tetrafluoroethylene, and siloxanes |
| Examples of Polymers | Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE), and silicones |
| Catalysts | Polymerization reactions require a catalyst for the reaction to occur between adjacent monomers |
| Byproducts | Condensation polymerization involves combining two monomers to form a dimer, releasing a byproduct (often water) that must be removed for the reaction to succeed |
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What You'll Learn
- Ethylene and propylene are used to produce polyethylene (PE) and polypropylene (PP) plastics
- Vinyl chloride is used in the synthesis of polyvinyl chloride (PVC)
- Styrene is a key monomer in the production of polystyrene (PS) and styrene acrylonitrile (SAN) plastics
- Acrylic is found in polymethyl methacrylate (PMMA), commonly known as acrylic glass
- Tetrafluoroethylene is the monomer for polytetrafluoroethylene (PTFE), known by the brand name Teflon
Ethylene and propylene are used to produce polyethylene (PE) and polypropylene (PP) plastics
Monomers are the tiny building blocks of plastics, and they play a crucial role in plastic manufacturing. Ethylene (C2H4) and propylene (C3H6) are two important monomers used in the production of polyethylene (PE) and polypropylene (PP) plastics, respectively. These monomers react and link together through a process called polymerization to form long polymer chains that give plastic its unique structure.
Polyethylene (PE) is a polymer composed of repeated ethylene monomer units (-CH2-CH2-). It can be produced through various processes, such as high-pressure polymerization, which yields low-density polyethylene (LDPE), a flexible and transparent material. LDPE has a wide range of applications, including packaging film, trash bags, wire insulation, toys, and housewares. On the other hand, high-density polyethylene (HDPE) is a rigid polymer with a higher density and a higher melting point than LDPE, making it suitable for applications like blow-molded bottles and appliance housings.
Polyethylene can also be modified by copolymerizing ethylene with other monomers, such as vinyl acetate or propylene, to create ethylene copolymers. One example is Surlyn, an ethylene-methacrylic acid copolymer used in golf ball covers. Additionally, polyethylene can be processed through techniques like injection molding and extrusion, allowing for the creation of complex parts and continuous shapes.
Polypropylene (PP), on the other hand, is a polymer composed of repeated propylene monomer units (-CH2-CH(CH3)-). It is known for its high strength, stiffness, and weld strength, making it suitable for applications requiring strong welds, such as piping systems and tanks. Polypropylene has a higher melting point than polyethylene, contributing to its ability to withstand higher temperatures. It is commonly used in food packaging due to its food-safe and moisture-resistant properties. Polypropylene can be manufactured through processes like injection molding, extrusion, and thermoforming, which involves shaping plastic over a mold using vacuum pressure.
The versatility of both polyethylene and polypropylene makes them major plastic types found in various consumer goods, from car parts to packaging materials. By manipulating variables such as monomer type, comonomer, and catalyst, manufacturers can control the physical properties of the resulting plastic, including density, stiffness, flexibility, and strength. This customization allows for the creation of plastics with specific characteristics tailored to their intended applications.
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Vinyl chloride is used in the synthesis of polyvinyl chloride (PVC)
Monomers are the building blocks of plastics. They are tiny particles that react and link together to form long strands known as polymer chains. These chains give plastic materials their unique structure, which can be linear, branched, or cross-linked. The length and configuration of these chains are critical as they determine the material's mechanical and physical attributes.
One such monomer is vinyl chloride, which is used in the synthesis of polyvinyl chloride (PVC). PVC is a synthetic resin made from the polymerization of vinyl chloride monomers. It is the world's third-most widely produced synthetic polymer of plastic, with about 40 million tons of PVC produced each year.
The polymerization of vinyl chloride was first achieved in 1835 by French chemist Henri Victor Regnault, and then again in 1872 by German chemist Eugen Baumann. However, it was not patented until 1912 when German chemist Friedrich Heinrich August Klatte used sunlight to initiate the polymerization process.
PVC comes in two main forms: rigid and flexible. Rigid PVC, also known as unplasticized PVC or UPVC, is a stiff, cost-effective, and impact-resistant plastic. It is commonly used in construction for pipes, doors, and windows, as well as packaging and bank or membership cards. It is also used in plumbing, electrical cable insulation, and flooring. On the other hand, flexible PVC is formed by adding plasticizers to PVC, making it softer and more flexible. This type of PVC is used in plumbing, electrical cable insulation, inflatable products, and rubber substitutes.
PVC is widely used in the building and construction industry due to its versatility, strength, and flame resistance. It has replaced traditional building materials such as wood, metal, concrete, rubber, and ceramics in many applications. Additionally, PVC is known for its strong resistance to chemicals, sunlight, and oxidation from water.
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Styrene is a key monomer in the production of polystyrene (PS) and styrene acrylonitrile (SAN) plastics
Styrene, an organic compound with the chemical formula C6H5CH=CH2, is a key monomer in the production of polystyrene (PS) and styrene acrylonitrile (SAN) plastics. It is a volatile compound with a low molecular weight, and its presence of the vinyl group allows it to polymerize.
Polystyrene is a synthetic polymer made from styrene monomers. It is one of the most widely used plastics, with production reaching several million tonnes per year. Polystyrene can be solid or foamed and is naturally transparent, but it can also be coloured. It is commonly used for disposable plastic cutlery, CD cases, packaging materials, containers, bottles, trays, and tumblers.
The production of polystyrene involves the polymerization of styrene monomers, where the carbon-carbon π bond of the vinyl group is broken, and a new carbon-carbon σ bond is formed, attaching to the carbon of another styrene monomer to create a chain. This process is known as addition polymerization, and it results in the formation of long polymer chains that give polystyrene its unique structure.
Styrene acrylonitrile (SAN) is another important plastic that utilizes styrene as a monomer. SAN is a copolymer of styrene and acrylonitrile, and it exhibits higher strength, rigidity, and chemical resistance compared to polystyrene. SAN is commonly used in household goods, tableware, cosmetics packaging, sanitary articles, writing materials, and office supplies.
The versatility of styrene as a monomer in plastic production is evident in its ability to form various polymers and copolymers, contributing to the development of a wide range of plastic products with diverse properties and applications.
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Acrylic is found in polymethyl methacrylate (PMMA), commonly known as acrylic glass
Monomers are the building blocks of plastics. They react and link together to form long strands known as polymer chains, which give plastic materials their unique structure. The length and configuration of these chains are critical as they determine the material's mechanical and physical attributes.
One such monomer is acrylic, which is found in polymethyl methacrylate (PMMA). Acrylic is commonly known as acrylic glass due to its optical properties, which are similar to those of glass. It is a clear, colourless polymer available in pellet, small granules, and sheet forms. It is also highly biocompatible, 100% recyclable, and non-biodegradable.
PMMA is a rigid thermoplastic that is widely used as a shatterproof replacement for glass. It is tough, easy to shape, and less costly than glass. It also has high resistance to UV light and weathering. Due to its transparency, PMMA is used in a variety of applications, including car windows, smartphone screens, aircraft windshields, canopies, and gun turrets, and aquariums.
PMMA was first brought to market in 1933 by German company Röhm & Haas AG and its former US affiliate, the Rohm and Haas Company, under the trademark Plexiglas. It was extensively used during World War II by both Allied and Axis forces for submarine periscopes, aircraft windshields, canopies, and gun turrets.
Today, PMMA continues to be used in a range of applications, including automotive headlamps, window and door profiles, panels, façade design, and advertising. It is also used in the medical field, having previously been a frequent component of contact lenses and currently being used for dentures and bone replacement.
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Tetrafluoroethylene is the monomer for polytetrafluoroethylene (PTFE), known by the brand name Teflon
Plastic is a synthetic polymer made by a reaction known as polymerization. This process involves the linking of monomers, which are small, single-unit molecules, to form long chains known as polymer chains. These chains give plastic materials their unique structure and properties.
Tetrafluoroethylene is a monomer that creates the polymer polytetrafluoroethylene (PTFE). PTFE is a synthetic fluoropolymer with numerous applications due to its chemical inertness, high heat resistance, low surface friction, and non-stick properties. It was accidentally discovered in 1938 by Roy J. Plunkett, an American chemist working for DuPont. Plunkett found that a tank of gaseous tetrafluoroethylene refrigerant had polymerized into a white, waxy, slippery substance.
PTFE is commonly known by the brand name Teflon, which was trademarked by DuPont in 1945. Teflon is hydrophobic, meaning neither water nor water-containing substances can wet its surface. It has one of the lowest coefficients of friction of any solid, making it ideal for non-stick coatings on cookware. PTFE is also used in various industrial applications, such as bearings, pipe liners, and parts for valves and pumps, due to its high melting point and resistance to corrosion and most chemicals.
The fabrication of PTFE products can be challenging due to the material's high melting point and low flowability. However, PTFE can be molded by compressing and heating fine powders mixed with volatile lubricants. It can also be applied as a permanent coating by spraying or dipping metallic surfaces with PTFE dispersions or by spinning PTFE fibres.
The process of polymerizing tetrafluoroethylene to create PTFE requires high pressures and careful handling due to the potential for explosive decomposition. The polymerization can be achieved through suspension or emulsion techniques, resulting in chemically identical products with slightly different physical forms. Overall, tetrafluoroethylene, as the monomer for PTFE, has led to the development of a versatile and high-performance plastic with a wide range of applications.
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Frequently asked questions
Monomers are the tiny building blocks of plastics. They are the individual small particles that form polymers, the large molecules that make up plastics.
Some of the most common monomers used in plastic production include ethylene, propylene, vinyl chloride, styrene, acrylic, and tetrafluoroethylene.
Monomers react and link together to form long polymer chains through a process called polymerization. These chains give plastic its unique structure, and the length and configuration of these chains determine the material's properties, such as flexibility and hardness.
Polyethylene (PE) is a common plastic created from the monomer ethylene. The length of the polymer chain in PE determines its hardness.
Manufacturers can manipulate the mechanical properties of plastic by altering the type and amount of monomers used. For example, monomers with larger molecular weights produce stronger and more rigid materials, while smaller monomers contribute to flexibility.
