Published On 4/20/2026
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Last update: 20:59 (Mecca time)
An international research team has succeeded in discovering the secret of the exceptional strength of one of the most widely used materials in modern life, which is reinforced rubber.
Although this substance we rely on daily in car tires, airplanes, and medical equipment, and is involved in an industry worth hundreds of billions of dollars, its physical behavior has remained a mystery that depends more on experience than understanding.
To solve the mystery, the study published in the Proceedings of the National Academy of Sciences focused on the basic material responsible for strengthening rubber, which is black carbon particles that are added to natural rubber to transform it from a soft material to another capable of withstanding the harshest conditions.
Computer simulation reveals the truth
The research team led by Dr. David Simons of the University of South Florida used more than 1,500 advanced molecular simulations, equivalent to about 15 years of computing, to study the interaction of hundreds of thousands of atoms inside reinforced rubber. The simulation aimed to understand how black carbon particles are distributed inside the rubber and their effect on its mechanical behavior.
The results showed that the main reason for the increase in rubber hardness is that carbon black prevents the occurrence of what is known scientifically as the concept of “Poisson’s ratio difference.”
This concept in materials science describes the state of mismatch between the way different parts within the same material respond when subjected to tension or pressure. When any material is stretched, it lengthens in the direction of tension, but at the same time it narrows in the lateral direction. This relationship is scientifically expressed by what is called “Poisson’s ratio.”
The researchers found that natural rubber, when stretched, expands longitudinally and narrows laterally, but the presence of black carbon prevents this natural contraction, creating an “internal conflict” within the material between expansion and resistance. This conflict makes the rubber more solid, more resistant to tearing, and more able to withstand pressure and heat.
A turning point in the history of materials science
The researchers say in an official press release published by the University of South Florida that this discovery represents a turning point in the history of materials science, because it not only provides a new explanation for the behavior of reinforced rubber, but also reformulates the theoretical basis on which industry and science have relied for many decades.
The researchers explain that since the beginning of the use of black carbon-reinforced rubber in the early twentieth century, development has relied on trial and error without a precise understanding of the physical mechanism that gives it strength and durability. Over time, and despite the great progress in engineering and materials science, the basic question remains: Why does rubber become harder in this particular way?
They add, “This discovery closes a knowledge gap that has lasted for more than a century, by clarifying that the secret does not lie in one simple factor, but rather in a complex internal interaction that makes the material resist its natural way of expanding. This new understanding is not limited to explaining an ancient phenomenon, but rather opens the door to a different stage in materials design, where it is possible to move from relying on experiment to building accurate scientific models capable of predicting the behavior of materials before they are manufactured.”
