Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F12: Polymer Physics Prize
8:00 AM–11:00 AM,
Tuesday, March 7, 2023
Room: Room 235
Sponsoring Unit: DPOLY
Chair: Constantino Creton, ESPCI Paris
Abstract: F12.00002 : A molecular picture of elastomer fracture*
8:36 AM–9:12 AM
In this work, we synthesized soft networks of poly ethyl acrylate (Tg = -20°C) at various crosslink densities, labeled with mechanosensitive crosslinkers that become fluorescent when they break. Crack propagation tests were then carried out on notched samples and we extracted the energy release rate during crack propagation and mapped the concentration of broken crosslinkers from the activation of mechanophores. For a given energy release rate, the areal density of broken crosslinkers was less dependent than expected on crosslink density but each broken crosslink appeared to dissipate energy proportional to its average length to the power 2.4. In our experimental system the two errors compensate each other. This experimental observation brings light to why the molecular model of Lake and Thomas predicts so well the scaling of the fracture energy with network structure even though the mechanism is physically more complex.
 Lake, G.J. and A.G. Thomas, Proc. Roy. Soc. A, 1967. A300: p. 108-119.
 Slootman, J., et al., Physical Review X, 2020. 10(4): p. 041045.
*This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program under grant agreement AdG no. 695351.
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