The History of the Invention of Plastics
How a series of nineteenth- and twentieth-century discoveries created the material that defines our age — and the problem that now accompanies it
A. Plastics are synthetic polymers — large molecules made by linking smaller molecular units called monomers into long chains. The properties of a plastic material depend on the length of these chains, the chemical composition of the monomers, and the way the chains are arranged and cross-linked. By varying these parameters, chemists have produced a vast family of materials with properties ranging from the rigid and transparent to the flexible and opaque — properties that have made plastics indispensable in applications from food packaging and medical devices to aerospace engineering and electronics.
B. The story of plastics begins with the search for a substitute for natural materials that were becoming scarce or expensive in the nineteenth century. Ivory — used for billiard balls, piano keys, and decorative objects — was in short supply as elephant populations declined due to hunting. In 1869, the American inventor John Wesley Hyatt developed celluloid — a material made by treating nitrocellulose with camphor — that could be moulded when warm and retained its shape when cool, making it a practical substitute for ivory in many applications. Celluloid was also used to produce photographic film and, later, motion picture film, making it a foundational material of both photography and cinema.
C. The first fully synthetic plastic was Bakelite, developed by the Belgian-American chemist Leo Baekeland in 1907. Unlike celluloid, which was derived from natural plant material, Bakelite was produced entirely from synthetic chemicals — specifically phenol and formaldehyde — and had no natural equivalent. It was hard, heat-resistant, and electrically non-conductive, making it ideal for electrical components. Bakelite became one of the defining materials of the early twentieth century, used in everything from telephone handsets and radio casings to kitchen utensils and jewellery. Baekeland's invention established the template for the synthetic polymer industry that would transform global material culture over the following decades.
D. The decades following the Second World War saw an explosion in the variety and production volume of synthetic plastics. Nylon, developed by DuPont in the late 1930s, had already demonstrated that synthetic polymers could match or exceed the performance of natural fibres; after the war, it moved from parachute fabric and military equipment into consumer applications including stockings, toothbrush bristles, and clothing. Polyethylene, first produced in the 1930s and manufactured at large scale from the 1940s, became the most widely produced plastic in the world, used in packaging films, bottles, and pipes. Polypropylene, polyvinyl chloride, polystyrene, and dozens of other synthetic polymers entered commercial production, each with distinct properties and applications.
E. The economic and social benefits of plastics have been enormous. Food packaging that extends the shelf life of perishable goods has reduced food waste and made previously unavailable foods accessible year-round. Plastic components have reduced the weight and cost of vehicles, aircraft, and consumer electronics. Medical applications — including disposable syringes, sterile packaging, blood bags, and implants — have improved the safety and accessibility of healthcare worldwide. The lightweight, durable, and chemically versatile nature of plastics has enabled product designs and applications that would have been impossible with any previous material.
F. The environmental consequences of plastics are now one of the defining challenges of the twenty-first century. Most synthetic plastics are not biodegradable and persist in the environment for hundreds of years. Annual global plastic production has grown from approximately two million tonnes in 1950 to over 400 million tonnes today, and the fraction that is effectively collected, sorted, and recycled has remained stubbornly low — estimated at around nine percent of all plastic ever produced. The rest has been incinerated, landfilled, or released into the environment, where it fragments into microplastics that are now detected in the most remote ecosystems on Earth, in the ocean, in the atmosphere, and in human bodies.
G. The development of genuinely biodegradable and bio-based plastics — materials that degrade under natural conditions and that are derived from renewable rather than petrochemical sources — is an active area of research and commercial development. Polylactic acid (PLA), derived from fermented plant sugars, and polyhydroxyalkanoates (PHAs), produced by bacterial fermentation, are among the most promising candidates. Current bio-based plastics remain more expensive than their conventional equivalents, require specific conditions to degrade effectively, and represent only a small fraction of total plastic production. Their development is, however, a necessary part of any realistic long-term solution to the plastics problem.