Making stresses in plastics and components visible
Research team led by TU Chemnitz develops dyes that continuously indicate stresses and their strength in plastics and components by changing colour
TU Chemnitz Pressestelle
Molecular "feather" shows the strength of the stress in terms of colour
As the researchers report in their publication, by combining a molecularly designed dye with a suitable and, above all, non-brittle plastic, macroscopic forces can now be transferred to the molecular scale. These acting forces can be, for example, external pressure or tension.
The dye molecule thus "feels" the force acting within the plastic and continues to indicate changes in force by changes in coloration. If the force on the plastic decreases, the dye molecule returns to its original state. This is why this dye is called a "molecular spring" - it stretches and then "springs" back to its original state.
Compared to existing molecular switches, which can indicate forces in plastics by changing color, the advantages here clearly lie in the stepless mapping of forces of different sizes as well as the spring-like behavior of the molecule, which can thus be used again and again.
Better mechanical properties - better understanding and applying damping
"This is a big step towards directly visualizing external stresses and residual stresses of plastics with simple analytics, which can be of great benefit for the further development of materials with improved mechanical properties or in the field of 3D printing," summarizes Prof. Dr. Michael Sommer.
But it could also make it easier to research the damping properties of special materials and also natural systems: For example, there are large and heavy fruits that fall from trees from great heights, but survive the fall undamaged. Nature serves as a model here and molecular springs could help to better understand and imitate such systems.
Future efforts will therefore focus on adapting molecular force springs for use in different plastics. This will require cooperation with other research groups and the use of computer-aided methods.
Note: This article has been translated using a computer system without human intervention. LUMITOS offers these automatic translations to present a wider range of current news. Since this article has been translated with automatic translation, it is possible that it contains errors in vocabulary, syntax or grammar. The original article in German can be found here.
Original publication
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