Omar Khalid
Plastic is any synthetic or semisynthetic organic polymer. The basic elements that make up most plastics are carbon, hydrogen, oxygen, nitrogen, chlorine, and sulfur. Plastics are usually solids and can be amorphous solids, crystalline solids, or semicrystalline solids. They are usually poor conductors of heat and electricity and are durable, with a slow rate of degradation. The first completely synthetic plastic was Bakelite, made in 1907 by Leo Baekeland, who also coined the term plastic, which comes from the Greek word plastikos, meaning something that can be shaped or molded.
| Characteristics | Values |
|---|---|
| Basic elements | Carbon, Hydrogen, Oxygen, Nitrogen, Chlorine, and Sulfur |
| Other elements | Polymers, additives, colorants, plasticizers, stabilizers, fillers, and reinforcements |
| Categories | Polymers with aliphatic carbon atoms, heterochain polymers |
| Types | Thermoplastics, thermosetting polymers, thermoplastic elastomers |
| Properties | Plasticity, low density, low electrical conductivity, transparency, toughness, durability, insolubility in water, non-toxicity |
| Uses | Beverage bottles, garden hoses, insulating food containers, shatterproof windows, compact discs, automobile interiors, packaging |
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What You'll Learn
- Carbon, hydrogen, oxygen, nitrogen, chlorine, and sulfur are the basic elements
- Plastics are synthetic or semi-synthetic organic polymers
- Thermosetting polymers solidify permanently, while thermoplastics can be remoulded
- Plastic additives include colorants, plasticizers, stabilizers, fillers, and reinforcements
- Plastic products include PET bottles, PVC garden hoses, and polystyrene containers
Carbon, hydrogen, oxygen, nitrogen, chlorine, and sulfur are the basic elements
Plastics are any synthetic or semisynthetic organic polymers. They are usually solid and can be amorphous, crystalline, or semicrystalline solids. They are typically poor conductors of heat and electricity, and most are insulators with high dielectric strength. The first completely synthetic plastic was Bakelite, made in 1907 by Leo Baekeland, who also coined the term "plastics". The word "plastic" comes from the Greek word "plastikos", meaning it can be shaped or moulded.
The basic elements that make up most plastics are carbon, hydrogen, oxygen, nitrogen, chlorine, and sulfur. Plastics can be divided into two categories based on their chemical composition. The first category includes plastics made up of polymers with only aliphatic (linear) carbon atoms in their backbone chains. The other category of plastics consists of heterochain polymers, which contain atoms such as oxygen, nitrogen, or sulfur, in addition to carbon.
Carbon and hydrogen are always present in plastics, and most industrial plastic is made from petrochemicals. The polymer used to make plastic is typically mixed with additives such as colorants, plasticizers, stabilizers, fillers, and reinforcements. These additives can affect the plastic's chemical composition, properties, and cost.
Plastics can also be categorised as thermoplastics or thermosetting polymers (thermosets). Thermoplastics can be heated and remoulded repeatedly, while thermosets solidify into permanent shapes. Thermoplastics may have a crystalline structure, and they typically have a molecular weight between 20,000 and 500,000 atomic mass units (amu).
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Plastics are synthetic or semi-synthetic organic polymers
Plastics are polymers, which consist of chains of linked subunits called monomers. These monomers can be identical, forming homopolymers, or different, forming copolymers. Polymers are organic compounds with a molecular weight between 20,000 and 500,000 atomic mass units. They can be divided into two main categories based on their chemical composition: those with only aliphatic (linear) carbon atoms in their backbone chains and those with heterochain polymers containing atoms like oxygen, nitrogen, or sulfur, in addition to carbon.
The basic elements that make up most plastics are carbon and hydrogen, along with other potential elements such as oxygen, nitrogen, chlorine, and sulfur. These elements form the monomers that polymerize to create plastics. The polymer used to make plastic is typically mixed with additives such as colorants, plasticizers, stabilizers, fillers, and reinforcements, which can impact the chemical composition and properties of the final product.
Plastics can be further categorized into two types: thermoplastics and thermosetting polymers (or thermosets). Thermoplastics can be heated and remoulded repeatedly, while thermosetting polymers solidify into permanent shapes and are considered to have infinite molecular weight. Thermoplastics, such as polyethylene and polypropylene, are commonly used in packaging and products that require flexibility and remoulding, whereas thermosetting polymers are used in more permanent applications where a rigid structure is needed.
Some common examples of plastics and their abbreviations include PET (polyethylene terephthalate), HDPE (high-density polyethylene), PVC (polyvinyl chloride), PP (polypropylene), PS (polystyrene), and LDPE (low-density polyethylene). These plastics are used in a variety of products, from beverage bottles and food containers to garden hoses and automobile interiors.
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Thermosetting polymers solidify permanently, while thermoplastics can be remoulded
Thermosetting polymers, also known as thermosets, solidify permanently during the curing process, which involves applying heat or radiation, pressure, or a catalyst. This process forms a cross-linked structure that prevents the material from being remelted and reshaped. Thermosets are known for their stiffness, superior mechanical capabilities, and resistance to deformation and higher temperatures compared to thermoplastics. They are commonly used in applications where these properties are advantageous, such as sealed goods and high-temperature applications.
On the other hand, thermoplastics are resins that can be remelted and remoulded. At room temperature, thermoplastics are solid, but they soften and become plastic upon heating. This allows them to be shaped using processes like injection moulding or blow moulding. Thermoplastics are known for their higher molecular weight compared to uncured thermosets and their ductile properties, which make them suitable for a wide range of applications.
The difference in behaviour between thermosetting polymers and thermoplastics arises from their underlying chemical structure. Thermosets are composed of strongly branched or cross-linked molecules that form covalent bonds during the curing process, resulting in an insoluble and infusible polymer network. This network of bonds gives thermosets their strength and heat resistance.
Thermoplastics, on the other hand, are composed of polymer chains with aliphatic (linear) carbon atoms or heterochain polymers containing atoms such as oxygen, nitrogen, or sulfur, in addition to carbon. These polymers do not have the same extensive cross-linking as thermosets, allowing them to transition between states with the application or removal of heat.
Some common thermosetting polymers include epoxy, polyimide, and phenolic resins, while thermoplastics include materials like polyethylene terephthalate (PET) and polyvinyl chloride (PVC). Understanding the unique properties of both types of polymers is essential for their effective use in various applications, such as in sealed goods, construction materials, electronics, and automotive parts.
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Plastic additives include colorants, plasticizers, stabilizers, fillers, and reinforcements
Plastic is a polymeric material that can be moulded or shaped, usually by applying heat and pressure. The basic elements that make up most plastics are carbon, hydrogen, oxygen, nitrogen, chlorine, and sulfur. However, the unique properties of plastics are often due to additives, which are additional compounds that are incorporated into the basic polymer formula. These additives can be organic or inorganic and are used to improve the processability, functionality, and aging properties of the polymer.
Plastic additives can be divided into four main categories: functional additives, colorants, fillers, and reinforcements. Functional additives include stabilizers, antistatic agents, flame retardants, lubricants, and slip agents, among others. These additives improve the performance and functionality of the plastic, such as during the shaping of the polymer through injection moulding or extrusion. For example, heat stabilizers prevent the thermal degradation of polymers when exposed to high temperatures, while internal lubricants improve the melt flow of the material by lowering viscosity and heat dissipation.
Colorants, as the name suggests, provide a variety of colours to the plastic. Pigments are commonly used colorants that give plastics their desired hue.
Fillers are additives that increase the overall "bulk" of the plastic. They are usually mineral-based, such as calcium carbonate, silica, clay, or carbon. Fillers can also improve the mouldability and stability of the plastic compound. For instance, carbon fibers are added to polymers to increase tensile strength without adding weight and improve electrical conductivity.
Reinforcements are additives that improve the tensile strength, flexural strength, and stiffness of the material. Examples include glass fibers and carbon fibers.
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Plastic products include PET bottles, PVC garden hoses, and polystyrene containers
PET Bottles
PET, or polyethylene terephthalate, is a type of plastic commonly used for bottles, accounting for about 30% of global demand. It is composed of carbon, hydrogen, and oxygen, with trace amounts of catalyst elements such as antimony. Antimony (Sb) is a metalloid element used as a catalyst in the form of compounds like antimony trioxide (Sb2O3) or antimony triacetate during the production of PET. PET bottles may also contain phthalates, which are endocrine disruptors.
PVC Garden Hoses
PVC, or polyvinyl chloride, is another widely used plastic. Garden hoses made of PVC often contain contaminants such as lead, bromine, antimony, and phthalates, which can pose health risks. These contaminants are not typically found in non-PVC hoses.
Polystyrene Containers
Polystyrene is a synthetic polymer made from styrene, a derivative of benzene. Its chemical formula is (C8H8)n, indicating that it contains carbon and hydrogen. It is a versatile plastic used for various products, including containers, bottles, and disposable cutlery. Polystyrene is naturally transparent but can be coloured with colourants. It has a low melting point and is an inexpensive resin per unit weight.
In summary, the plastic products mentioned—PET bottles, PVC garden hoses, and polystyrene containers—contain different combinations of elements, including carbon, hydrogen, oxygen, and in some cases, contaminants like lead and bromine. These elements and their unique arrangements give each plastic type its distinct properties and applications.
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Frequently asked questions
All plastics are polymers but not all polymers are plastics. Plastics are usually made up of carbon and hydrogen, but they can also include other elements such as oxygen, nitrogen, chlorine, and sulfur.
Some common examples of plastics are PET, HDPE, PVC, PP, PS, LDPE, and Bakelite.
Polymers are chains of linked subunits called monomers. If identical monomers are joined, it forms a homopolymer. Different monomers link to form copolymers.
