Chloe Zhang
The 20th and 21st centuries have been dubbed the Plastics Age, and experts estimate that 30 to 50 percent of all scientific discoveries are accidental. One such discovery was the first fully synthetic plastic, Bakelite, which was invented in 1907 by Belgian chemist Leo Baekeland. Baekeland's initial goal was to create a cheaper alternative to shellac, but he ended up creating a unique polymer that did not melt under heat and stress. This discovery sparked a consumer boom and revolutionised the use of synthetic materials.
| Characteristics | Values |
|---|---|
| Year of Invention | 1907 |
| Inventor | Leo Baekeland |
| Country | Belgium |
| Reason for Invention | To create a replacement for shellac |
| Chemicals Used | Formaldehyde and phenol |
| Type of Plastic | Bakelite, the first fully synthetic plastic |
| Plastic Properties | Hard, resistant to heat and electricity, and can't be easily melted or scorched once cooled |
| Uses | Handles, phones, auto parts, furniture, and jewelry |
| Impact | Sparked a consumer boom in affordable yet desirable products |
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What You'll Learn
- Belgian chemist Leo Baekeland invented the first fully synthetic plastic, Bakelite, in 1907
- Bakelite was made by combining formaldehyde and phenol under heat and pressure
- The invention of Bakelite led to a whole class of plastics known as phenolic resins
- Polyethylene (PE), the world's most ubiquitous plastic, was also invented by accident
- PE was discovered during high-pressure experiments with ethylene and benzaldehyde
Belgian chemist Leo Baekeland invented the first fully synthetic plastic, Bakelite, in 1907
Baekeland's quest to invent a synthetic substitute for shellac, an expensive product derived from lac beetles, led to the discovery of Bakelite. He combined phenol (then known as carbolic acid) with formaldehyde and subjected the mixture to heat and pressure. This created a unique polymer that didn't melt under heat and stress. The new thermosetting plastic was soon used for a wide range of products, from phones to jewellery to clocks. It was also the first synthetic material that didn't seek to mimic natural materials, marking the beginning of a new era of synthetic materials.
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Bakelite was made by combining formaldehyde and phenol under heat and pressure
In 1907, Belgian chemist Leo Baekeland invented Bakelite, the first fully synthetic plastic, by accident. Baekeland's initial goal was to create a cheaper alternative to shellac, a costly product derived from lac beetles. To achieve this, he combined formaldehyde, a waste product of coal, with phenol. He then applied heat and pressure to the mixture.
The resulting polymer exhibited unique characteristics that distinguished it from other materials at the time. Notably, it did not melt under heat and stress, a property that made it particularly useful for various applications. This marked the beginning of a new era in synthetic materials, as it was the first synthetic resin to be commercially produced and did not seek to imitate natural materials.
The process of creating Bakelite involves a multi-step procedure centred around the reaction between phenol and formaldehyde. A catalyst, such as hydrochloric or zinc chloride, facilitates the reaction. When phenol and formaldehyde are heated together, they undergo a condensation reaction, resulting in a liquid condensation product known as Bakelite A.
As the mixture continues to be heated, its structure becomes more complex. Eventually, with sufficient heating, an insoluble hard gum forms, serving as the foundation for Bakelite. Careful control of the heating process is essential to prevent excessive foaming and ensure the final product is dense and hard.
The final stage involves compression moulding, where the resin is combined with fillers like wood flour and placed in a mould under high pressure and heat, typically around 150°C (302°F). This curing process transforms the resin into a solid, thermosetting plastic material that cannot be remoulded after curing.
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The invention of Bakelite led to a whole class of plastics known as phenolic resins
The first fully synthetic plastic, Bakelite, was invented in 1907 by Belgian chemist Leo Baekeland. Baekeland's initial goal was to create a cheap replacement for shellac, an expensive product derived from lac beetles. In his experiments, he combined formaldehyde with phenol, a waste product of coal, and subjected the mixture to heat. Unexpectedly, instead of a material similar to shellac, he created a unique polymer that did not melt under heat and pressure. This new thermosetting plastic could be easily moulded when hot and solidified into a hard plastic that was resistant to heat and electricity.
The invention of Bakelite sparked a consumer revolution, making affordable yet desirable products widely available. Its dark brown, wood-like appearance made it ideal for mass-producing trendy Art Deco items. Iconic 20th-century products like the Purma camera, the GPO telephone, and the Ekco AD36 radio were all made using Bakelite. Due to its versatility, Bakelite was used in a diverse range of products, from phones and auto parts to clocks, jewellery, and furniture.
Bakelite's unique properties and wide range of applications inspired the development of a whole class of plastics known as phenolic resins. These plastics shared similar properties with Bakelite, including heat resistance and the ability to be moulded and solidified into hard plastic forms. The invention of Bakelite and the subsequent creation of phenolic resins marked a significant shift towards synthetic materials, no longer aiming to mimic natural substances but rather offering unique and improved characteristics.
The discovery of Bakelite and the subsequent development of phenolic resins have had a lasting impact on the world of plastics and synthetic materials. Bakelite's success in the consumer market demonstrated the potential of synthetic plastics, leading to further innovations and the creation of new plastic polymers. The story of Bakelite's invention illustrates the serendipitous nature of scientific discovery, where recognising the potential in unexpected results can lead to groundbreaking innovations that shape our world.
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Polyethylene (PE), the world's most ubiquitous plastic, was also invented by accident
Polyethylene (PE), the world's most common plastic, was first synthesised by German chemist Hans von Pechmann in 1898. Pechmann accidentally created the white, waxy substance while investigating diazomethane. However, it was not until 1933 that the first industrially practical polyethylene synthesis was discovered by Eric Fawcett and Reginald Gibson at the Imperial Chemical Industries (ICI) in Northwich, England.
Fawcett and Gibson's discovery came about during high-pressure experiments on ethylene. A test vessel had leaked, and a trace of oxygen was present in the fresh ethylene sample, acting as an initiator. Polyethylene formed overnight. The experiment was initially difficult to reproduce due to the accidental nature of the reaction initiation. However, in 1935, another ICI chemist, Michael Perrin, developed this accident into a reproducible high-pressure synthesis for polyethylene, which became the basis for industrial low-density polyethylene (LDPE) production beginning in 1939.
During World War II, further research was conducted on the ICI process, and large-scale commercial production of polyethylene commenced in the United States under license from ICI. The development of catalysts that promoted polymerisation at mild temperatures and pressures was a landmark breakthrough in the commercial production of polyethylene. Today, PE is used in a wide range of applications, from supermarket bags to bulletproof vests, and has helped revolutionise food storage with its flexible packaging capabilities.
The accidental discovery of polyethylene highlights the serendipitous nature of scientific advancements. While the initial quest may be focused on a specific goal, unexpected results can lead to innovations that change the course of history, such as the creation of the world's most ubiquitous plastic through the chance discovery of PE.
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PE was discovered during high-pressure experiments with ethylene and benzaldehyde
Polyethylene (PE) was first synthesized by German chemist Hans von Pechmann in 1898 while investigating diazomethane. Pechmann's colleagues, Eugen Bamberger and Friedrich Tschirner, recognized that the white, waxy substance he had created contained long −CH2− chains and termed it polymethylene. However, the first industrially practical polyethylene synthesis was accidentally discovered in 1933 by Eric Fawcett and Reginald Gibson at the Imperial Chemical Industries (ICI) works in Northwich, England.
Fawcett and Gibson conducted high-pressure experiments, heating a mixture of ethylene and benzaldehyde to 170°C (338°F) under 1,900 atmospheres (1,925 bars) of pressure. This resulted in explosive reactions, and safety concerns led ICI to halt the research. Despite the challenges, the experiments produced a white, waxy solid that was later identified as PE. The discovery of PE, also known as polythene, occurred when Williams and his colleagues, Michael Perrin and John Paton, reinvestigated the experiments of Gibson and Fawcett using ethylene alone. They observed a pressure drop and obtained 8.5g of white PE powder at the end of the reaction. The vessel had leaked, and it was later confirmed that a trace of oxygen was present in the fresh ethylene added to the reaction vessel, which played a crucial role in initiating the reaction.
The early forms of PE had limited uses due to their soft nature and low melting point. This was attributed to the irregular chain formation of ethylene molecules during the high-pressure polymerization process. However, German professor Karl Ziegler made a groundbreaking discovery in 1953 by polymerizing ethylene at low pressure using catalysts. This new process allowed for more controlled ethylene molecule joining, resulting in a more rigid form of PE that could withstand boiling water.
The ability to vary the pressure during the production of polyethylene polymers revealed that the properties of the polymer could be altered. This flexibility in manufacturing made polyethylene polymers highly desirable to producers, as they could tailor the product to meet specific customer requirements. The development of Ziegler-Natta catalysts, which include titanium(III) chloride, and Phillips catalysts, which are based on chromium(VI) oxide deposited on silica, have further contributed to the advancements in polyethylene production.
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Frequently asked questions
The first fully synthetic plastic, Bakelite, was invented in 1907 by Belgian chemist Leo Baekeland. He combined formaldehyde with phenol, a waste product of coal, under heat and pressure, inadvertently creating a polymer that didn't melt under heat and stress.
Baekeland's initial quest was to invent a cheap replacement for shellac, an expensive product derived from lac beetles.
Bakelite can be molded when hot and solidified into a hard plastic. It has been used for handles, phones, auto parts, furniture, and jewelry.
Polyethylene, or PE, was discovered by accident in the 1930s by scientists at the UK chemical company ICI. It was the first of many other plastics, including Dacron, Styrofoam, polystyrene, and vinyl.
