Shock Wave Energy Dissipation in Catalyst-Free Poly(dimethylsiloxane)
Vitrimers
Posted on 2020-06-15 - 04:46
Materials that absorb
shock wave energy from blasts and high-speed
impacts are critical for protection of structures, vehicles, and people.
Incorporating dynamic bonds into polymers has enabled precise control
over the time-dependent response and energy-dissipating modes, but
this work has focused on much slower time scales and lower forces
than those associated with shock waves. Here, we design polymers networks
with dynamic covalent bonds, called vitrimers, where reversible exchange
reactions provide a potential mechanism for shock wave energy dissipation.
Increasing the density of dynamic bonds leads to a systematic increase
in energy dissipation, measured by the drop in peak pressure of a
laser-induced shock wave. An analogous permanent polymer network shows
no dependence of dissipation on cross-link density. The vitrimers
can absorb shock multiple times while maintaining performance, attributed
to bond exchange and the intrinsic self-healing ability of the polymer.
Our results are the first to demonstrate that vitrimers are an effective
route to the design of energy-dissipating materials, particularly
at the high frequencies and pressures associated with shock waves.
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Lee, Jaejun; Jing, Brian B.; Porath, Laura E.; Sottos, Nancy R.; Evans, Christopher M. (2020). Shock Wave Energy Dissipation in Catalyst-Free Poly(dimethylsiloxane)
Vitrimers. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.0c00784