Peer-reviewed veterinary case report
How penetrant molecules move through vitrimer polymer networks
By Lin MH et al.·2026·Department of Chemical and Biological Engineering, United States·View original on Europe PMC →
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Original publication title: Molecular simulation study of penetrant diffusion in vitrimer networks.
Plain-English summary
This study looks at how certain materials, called vitrimers, allow small particles to move through them. Vitrimers are similar to other types of polymers but can change their structure over time due to chemical reactions. The researchers used computer simulations to see how the movement of these particles changes based on their size, temperature, and how quickly the vitrimers can rearrange themselves. They found that smaller particles move through the vitrimers at a consistent rate, but larger particles move faster when the vitrimers can rearrange more quickly. This suggests that the way the vitrimers change affects how tightly the particles are confined, which influences their movement.
Abstract
The diffusivity of penetrants in polymer networks can be tailored by network topology, which is relevant to applications such as chemical separation membranes or the design of barrier coatings. Recent studies on permanent polymer networks have revealed how cross-linking affects both segmental relaxation and the entropic mesh confinement, and consequently, both physical phenomena affect penetrant diffusive dynamics. We build on this finding and investigate how penetrant diffusion occurs in vitrimers, materials with the same network topology as permanent networks but capable of topological rearrangement via bond exchange reactions. The structural relaxation of vitrimer networks is influenced by the kinetics of these bond exchange reactions. We employ molecular dynamics simulations to investigate how dynamic network rearrangement affects penetrant diffusion for various penetrant sizes, temperatures, vitrimer cross-link densities, and bond exchange rates. Our studies show that the diffusivity of small penetrants is largely unaffected by varying bond exchange rates; however, as the penetrant size increases, faster bond exchange rearrangements lead to enhanced diffusivity. Notably, this enhancement cannot be fully accounted for by changes in penetrant alpha hopping times, suggesting that bond exchange kinetics primarily affect the mesh confinement of penetrant diffusion in vitrimers.
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Search related cases →Original publication on Europe PMC: https://europepmc.org/article/MED/41954256