New polymer glows white when stretched
Polymer reversibly glows white when stretched – Headline Science
Scientists have developed a technology for integrating molecules that respond to mechanical stress into polymers. They start to glow brightly when damaged or overused..
Previous versions of polymers that respond to external mechanical forces had weak bonds that quickly collapse under the influence of light and heat. Because of this, their practical effectiveness was reduced, and the effect was irreversible. Researchers at Adolf Merkle University of Friborg and Hokkaido University have solved this problem..
They developed new type sensory molecule, which is activated only under the action of mechanical force, and retains wherein chemical bonds. The molecule consists of two parts that can freely stretch and move away from each other, but then mechanically adhere again.
The new concept is robust and versatile. This allows you to adapt the properties of the substance to different materials and achieve bright white fluorescence.. For this what is needed is a combination of blue, green, red (or orange) sensor molecules and their response to displacement. In the passive state, they do not appear, but when stretched, they begin to glow. Brightness depends on the degree of deformation. This process is completely reversible..
Such materials can be applied to visualize the ultimate loads on individual components or to determine the mechanical stress on parts. Such sensors can also be useful in fundamental research of materials and biological systems..
Recently engineers have developed gas analyzing filaments that change color when various hazardous gases are detected in the air or under water.