Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session N00: Poster Session II (11:30am-2:30pm CST)
11:30 AM,
Wednesday, March 6, 2024
Room: Hall BC
Sponsoring
Unit:
APS/SPS
Abstract: N00.00045 : How does gelation impact the mechanical properties of polymer networks? Insights from polymer mechanochemistry
Presenter:
Aaliyah Z Dookhith
(University of Texas at Austin)
Authors:
Aaliyah Z Dookhith
(University of Texas at Austin)
Gabriel E Sanoja
(The University of Texas at Austin)
Here, I will discuss the use of chain transfer agents and catalysts to control the concentration of chain ends during gelation, the percolation threshold, the static heterogeneities, and the small- and large-strain mechanical properties of polymer networks. I will consider three (3) networks with similar densities of elastically active chains and evaluate their architecture and mechanical properties through confocal microscopy, tensile tests, and mechanochemistry. I will show that delayed percolation of polymer networks results in nucleation of static inhomogeneities near the gel point, and lower chain extensibilities and delocalized stresses ahead of the crack front. Finally, I will provide rationale for controlling gelation to design networks with an optimal combination of reversible elasticity and fracture toughness at high temperatures and solvent concentrations.
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