Sofia Martinez
Plastic is a synthetic or semi-synthetic organic polymer derived from petrochemicals. It is made of carbon and hydrogen, often mixed with additives for different properties. The word plastic comes from the Greek word plastikos, meaning capable of being shaped or molded. Plastics are versatile materials found in everything from airplanes to water bottles. They are used in packaging, siding, piping, and insulation, among other applications. The development of plastics began in the 19th century with the discovery of vulcanization to harden natural rubber, and the first fully synthetic plastic, Bakelite, was invented in 1907. Plastics are polymers with a unique structure that gives them their characteristic properties, such as durability and flexibility.
| Characteristics | Values |
|---|---|
| Definition | A group of materials, either synthetic or naturally occurring, that may be shaped when soft and then hardened to retain the given shape. |
| Chemical composition | Plastics are polymers made of carbon and hydrogen, often mixed with additives for different properties. |
| Additives | Colorants, plasticizers, stabilizers, fillers, and reinforcements. |
| Common examples | PET, HDPE, PVC, PP, PS, LDPE, and polyethylene. |
| Raw material | Resin. |
| Common resins | Polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS). |
| Polymerization | Two types: addition polymerization and condensation polymerization. |
| Additive toxicity | Many plastic additives are toxic and may leach into the environment. Examples include phthalates. |
| Thermal properties | Thermosetting plastics solidify permanently, while thermoplastics can be reshaped by heating multiple times. |
| Electrical properties | Plastics are usually poor conductors of electricity. |
| Mechanical properties | Plastics tend to be durable, with a slow rate of degradation. |
| Applications | Plastic is used in packaging, siding, piping, bicycle helmets, child safety seats, automotive airbags, and more. |
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What You'll Learn
Plastic is a polymer
Plastics are a specific type of synthetic or semi-synthetic polymer with a large molecular mass and a mostly linear structure. They are derived from petroleum hydrocarbons and are created through a polymerization or polycondensation process. In this process, oil and natural gas are refined to form gases like ethane and propane, which are then heated to form monomers. These monomers are then mixed with a catalyst to form a polymer. The polymer is then extruded, cooled, and cut into pellets, which are shipped to plastics fabrication companies worldwide.
Plastics are typically made from crude oil, but they can also be made from coal, natural gas, and cellulose. The first synthetic plastic, Bakelite, was created in 1907 or 1909 for telephone and electrical components. Plastics have become an integral part of the global economy due to their immense versatility and low production costs. They are used in a diverse range of applications, from packaging and piping to medicine, automobiles, and homes.
However, plastics have also created environmental challenges due to their slow biodegradability and the use of petrochemical products in their production, which contributes to rising global temperatures. Efforts are now underway to tackle the problem of plastic waste in marine ecosystems and find more environmentally friendly alternatives, such as bio-based polymers.
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Plastics are synthetic or semi-synthetic
Plastics are created through the polymerization of monomers, which are the basic units of a polymer. Polymerization can occur through two processes: addition polymerization or condensation polymerization. In addition polymerization, monomers join by attaching themselves to the end of the last unit in the chain, similar to linking paper clips together. Examples of plastics formed by this process include polyethylene, polystyrene, and acrylic. These polymers are often thermoplastic, meaning they can be softened by heat and hardened by cooling, making them easy to process and recycle.
Condensation polymerization, on the other hand, involves the elimination of a small molecule as monomers join together. Nylons, some polyesters, and urethanes are examples of condensation polymers. These polymers can be either thermoplastic or thermosetting. Thermosetting plastics solidify permanently, while thermoplastics can be reshaped by heating multiple times.
Plastics have a wide range of applications in our daily lives, from plastic bottles and bags to modern-day water pipes. They are also used in agriculture, packaging, and various products that enhance our safety and convenience, such as bicycle helmets, child safety seats, automotive airbags, and cell phones. Additionally, plastic insulation and sealants contribute to energy efficiency in our homes.
The development of plastics began in the 19th century with the chemical modification of natural polymers like cellulose and latex. The first fully synthetic polymer, Bakelite, was produced in 1907, and the first semisynthetic fiber, rayon, was developed from cellulose in 1911. However, the mass production of synthetic plastics began during World War II when natural sources of materials became scarce. Synthetic rubber and nylon were in high demand during this time, leading to the widespread adoption of synthetic polymers.
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Plastics are derived from petrochemicals
Plastic is a group of materials that can be shaped when soft and then hardened to retain a given shape. Plastics are synthetic or semi-synthetic polymers made of carbon and hydrogen, often mixed with additives for different properties.
Synthetic plastics are derived from petrochemicals, which are made from fossil fuels and chemicals. Petrochemicals are produced by drilling holes and extracting oil from underground. This oil is then pumped to the surface and transported to the shore via tankers. Crude oil is a mixture of hundreds of hydrocarbons that contain solids and gaseous hydrocarbons from the alkane family. The distillation step breaks down the complex hydrocarbons into simpler low-relative-molecular-mass alkenes/alkanes through high temperatures and pressure. The obtained long-chain hydrocarbons are then converted into hydrocarbons that can be used to prepare a wide range of products, including plastics.
The raw material used by the petrochemical industry is primarily naphtha and natural gas from oil refining operations. Alkanes from this process can be used as feedstock for petrochemical crackers, while olefins such as propylene, ethylene, and butylenes can be used as direct inputs for plastics manufacturing. The petrochemical industry has a high degree of flexibility in the feedstock it consumes, and specific details regarding the amounts and origins of the materials used in plastics manufacturing are often challenging to identify.
Synthetic polymers, including plastics, gained prominence in the early 20th century due to their ability to be engineered to yield desired properties. The first totally synthetic polymer, Bakelite, was produced in 1907, and the first semi-synthetic fiber, rayon, was developed from cellulose in 1911. However, the mass production of synthetic polymers began during World War II when natural sources of latex, wool, silk, and other materials became scarce. Synthetic rubber was needed for tires, and nylon replaced silk in parachutes.
Today, synthetic polymers in the form of plastics are widely used, and the plastics industry is one of the fastest-growing industries globally. The ease of manufacturing methods involved in processing crude oil has led to the predominance of synthetic plastics over bio-based plastics, which are derived from renewable sources such as carbohydrates, starch, vegetable fats, oils, bacteria, and other biological substances.
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Plastics are made from resins
The word "plastic" comes from the Greek word "plastikos", which means it can be shaped or moulded. Plastics are synthetic or semi-synthetic organic polymers, and polymers are substances made of many repeating units. Plastics are derived from petrochemicals and are dense and hard in nature. They are formed by the polymerisation of monomers, which are the subunits that make up polymers. Polymerisation can occur through addition polymerisation or condensation polymerisation.
Resins, on the other hand, are derived from plants and are natural products. They are organic substances that are convertible into polymers. The main base of all plastics is plastic resins, and these resins are transformed through different processes to fit specific needs. Resins are the raw material for manufacturing plastic products and are used as a feedstock, a chemical intermediate, or as a main ingredient.
Some common resins used in plastics include polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS). These resins are often used in packaging and can be coloured by adding pigments during the creation process.
The process of creating plastics from resins involves a "cracking process", where high heat breaks down and cracks the hydrocarbons in the resins. After this, the different compounds created are formed into chains, or polymers, which give plastics their characteristic properties.
Plastics have replaced many traditional materials such as stone, horn, wood, leather, metal, and glass due to their low cost, versatility, ease of manufacturing, and ability to be moulded into various forms. However, the use of plastics has also led to environmental concerns due to their slow rate of degradation and the presence of toxic additives.
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Plastics are durable and slow to degrade
In chemistry, plastics are synthetic or semisynthetic organic polymers made of carbon and hydrogen, often mixed with additives for different properties. The word "plastic" comes from the Greek word plastikos, which means it can be shaped or moulded. Plastics are durable and resistant to degradation, but they do eventually degrade.
Plastics are synthetic polymers that came into prominence in the early 20th century. Chemists can engineer plastics to yield a desired set of properties, such as strength, permeability, porosity, opacity, and colour. The durability of plastics is due to their chemical and biological inertness, which is a result of their high molecular weight and hydrophobicity, and the absence of functional groups that are susceptible to attack by microbial enzymes, light, water, etc. This makes them ideal for applications such as food packaging, sterile medical uses, and construction.
However, the recalcitrance and impermeability of plastics also make them long-lived when they are discarded, contributing to environmental contamination. Plastic waste is generated at a rate approaching 400 Mt per year, and the amount of plastics accumulating in the environment is growing rapidly. While it is estimated that only 10% of plastic waste is recycled, and 14% is incinerated, the rest is dumped into landfills or otherwise enters the natural environment.
The degradation rate of plastics depends on various factors, such as the specific environment, the presence of antioxidants and
There is ongoing research into the biological degradation of plastics and microplastics by various bacterial strains and their enzymes. While plasticizers and additives in the composition of plastics can cause harmful impacts, pretreatments to improve the efficiency of biodegradation can help reduce toxic plastic pollution. Microbial degradation is of great significance in reducing the negative impact of plastics, and exploring the ability of bacteria and the interaction between bacterial enzymes and plastics is critical to obtaining key biodegradable microorganisms.
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Frequently asked questions
Plastics are polymers made of carbon and hydrogen, which are often mixed with additives to achieve different properties. The raw material for manufacturing plastic products is called a resin, and some of the most common resins are polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS).
The word "plastic" comes from the Greek word "plastikos", which means "capable of being shaped or molded".
Plastics can be found in a variety of objects, from airplanes to water bottles. They are used in bicycle helmets, child safety seats, automotive airbags, and cell phones. In the home, plastic insulation, sealants, and other building products help improve energy efficiency and reduce heating and cooling costs. Plastics are also used in packaging to keep food fresh and extend its shelf life.
