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From bond breaking to material failure in soft polymer networks

Projektbeschreibung

Mechanosensoren heben Dehnungen und Bindungsbrüche in weichen Polymernetzwerken hervor

Weiche polymere Materialien einschließlich intelligenter, auf Reize reagierender Polymere und Elastomere revolutionieren Anwendungen in Bereichen wie der Robotik, der Unterhaltungselektronik und den erneuerbaren Energiesystemen. Polymere Netzwerke, die sich auf mehr als einem Polymer stützen, werden diese Möglichkeiten erweitern. Im Rahmen des vom Europäischen Forschungsrat finanzierten Projekts SOFTBREAK werden dessen innovative Mechanosensoren in modernsten physikalischen Experimenten in Kombination mit fortgeschrittener Modellierung eingesetzt, um die schlecht erforschten mikroskopischen Versagensmechanismen in weichen Polymermaterialien zu charakterisieren. Die Mechanosensoren – Moleküle, die als Reaktion auf eine Kraft ihre Farbe ändern oder Licht aussenden, wenn sie brechen – werden es ermöglichen, die räumliche Verteilung sowohl von Dehnungen als auch von Bindungsbrüchen in Echtzeit zu erfassen. Die Ergebnisse werden die Frakturphysik voranbringen und die Entwicklung besserer Materialien unterstützen.

Ziel

The microscopic mechanisms that lead to mechanical failure of soft polymer materials are still poorly understood. The main reason for this is a lack of experimental tools to prepare well-controlled model systems and to observe the failure process in real time at the microscopic scale. Here, I propose to fill this gap by taking a multidisciplinary approach that combines innovative chemical tools with state-of-the art physical experiments and modelling. Previous work in my group has led to the development of polymer networks with extremely well-controlled architecture and bond strength, and of various tools to study their structure and mechanics. Here, I will take advantage of this expertise to systematically unravel the microscopic physics of failure of polymer networks.
To visualize how the failure process proceeds, we will make use of recently developed mechanosensors, molecules that change colour in response to a force or that emit light when they break. These chemical tools will allow us to map in real time the spatial distribution of both strains and bond rupture events. Together with computer simulations carried out in parallel, this will give us unprecedented insight in the microscopic processes that occur during failure of the material, from the very first bonds that rupture, to the gradual accumulation of damage, all the way to macroscopic failure. We will use this to address the following unresolved questions about failure of polymer networks:
1. What is the microscopic mechanism that leads to delayed failure of polymer networks at subcritical loads?
2. How does the initiation of failure depend on the material's heterogeneity?
3. How does failure occur in a network with transient (viscoelastic) bonds?
The project will not only provide detailed insight in the physics of failure of polymer networks, but it will also shed light on fracture physics in general. Finally, it will help material scientists to design new materials with superior properties.

Gastgebende Einrichtung

WAGENINGEN UNIVERSITY
Netto-EU-Beitrag
€ 2 000 000,00
Adresse
DROEVENDAALSESTEEG 4
6708 PB Wageningen
Niederlande

Auf der Karte ansehen

Region
Oost-Nederland Gelderland Veluwe
Aktivitätstyp
Higher or Secondary Education Establishments
Links
Gesamtkosten
€ 2 000 000,00

Begünstigte (1)