In 1933, one unexpected waxy deposit inside a reactor helped create modern plastic forever

Polyethylene, which is one of the most commonly used plastics, owes its existence to an unfortunate experiment in a laboratory. In 1933, two chemists, Eric Fawcett and Reginald Gibson, working at Imperial Chemical Industries, or ICI, in England, were performing an experiment on ethylene gas at very high pressure. The chemists were trying to see the reaction process which might give rise to new industrial materials.

But, rather than the expected reaction, there was a strange waxy substance left in the equipment. Initially, the chemists thought that the substance was just another sign of a failed experiment or contamination. But, soon enough, it turned out that the substance was much more than that. This unexpected product was polyethylene, which later became indispensable in packaging, insulation, and other applications.

The accident in the reactor


As per Syracuse University Plastics Collection, the first ever synthesis of polyethylene occurred accidentally when the chemists performed high-pressure experiments in 1933. The experiments were conducted under difficult conditions where temperature and pressure were involved.

In addition to this, the experiments involved reactive gases. Polymer chemistry in the early stages had been unpredictable, especially when conducted in industrial reactors. What made the waxy substance different? Scientists discovered that the substance could be melted, shaped, and processed into lightweight plastic products.

This discovery meant that high-pressure ethylene reactions could lead to the creation of long-chain polymers instead of just small chemicals.

How high pressure altered the chemistry

The reaction parameters were key to the discovery. According to a study published by PubMed Central, even now, the industrial polyethylene synthesis process requires very high pressures and temperatures. These extreme conditions allow for the binding of ethylene molecules in the form of long chains, which can create flexible plastic substances.

As explained in the same study, controlling such reactions was challenging in the early days of polymer chemistry because of unexpected textures, deposits, and residues appearing in reactors. Such a background may help us understand why, at first, the wax-like substance appeared to be insignificant. In such an unpredictable environment, it was not clear if one should regard unexpected reactions as errors or signs.

From a residue to an industrial material

After understanding the potential of polyethylene, manufacturers started considering its possible applications. According to The American Chemical Society, early polyethylene was a low-density plastic made under high-pressure conditions at ICI. In subsequent years, scientists invented more effective techniques, allowing controlling strength and structure of plastics.

By the 1950s, production of polyethylene started increasing rapidly. The American Chemical Society states that later Phillips Petroleum scientists managed to invent high-density polyethylene, or HDPE, by means of catalysis. This technique produced sturdier types of the material. Such discoveries contributed to the transformation of polyethylene from an object of laboratory studies into an industrial material.

Reasons behind rapid adoption of polyethylene for packaging

Polyethylene appeared to be very valuable due to its applicability. The material was rather light, flexible, moisture-proof, and cheap to produce. These qualities were helpful for making bags, bottles, liners, insulation, and containers for food. Scientists also conducted investigations devoted to permeability of various substances through polyethylene barriers.

Various studies state that chemical permeation through polyethylene containers was utilized for packaging pharmaceuticals. This proves that the material had become sufficiently reliable for such purposes. Popularity of polyethylene arose because companies required cheap materials which could protect goods while being shipped or stored.

Polyethylene continued to evolve even after the accident

The initial waxy substance was just the start of the polyethylene saga. Over the years, various ways of synthesizing the polymer have been discovered, which have altered its characteristics significantly. As explained by the Royal Society of Chemistry, today's polyethylene manufacturing methods include free radical synthesis, Ziegler-Natta catalytic synthesis, and metallocene catalyst systems.

These methods make it possible for researchers to have more control over the plastic’s properties. Thus, today there are many varieties of polyethylene which suit different applications and industries. Research on this polymer is ongoing.

Why this story is relevant today

This tale is still relevant due to the unusual way in which new materials and discoveries emerge in industry. The chemists did not intend to discover the most widespread plastic. They were conducting research into complicated chemical reactions at high pressures.

It was only because the scientists decided to look into the waxy substance rather than discard it that its significance emerged. This marked the beginning of one of the biggest materials industries in the recent history of humankind.

Currently, polyethylene is used in packaging, home appliances, medical devices, and machinery. Its applications go far beyond the reactor where it first emerged. In addition, the case provides another general lesson regarding science. In the field of chemistry, an anomaly may not be a mistake but rather the beginning of something entirely new.