Drastic swelling-induced softening of polymer networks with non-covalent cross-linking bonds
Our recent work introduces a microscopically motivated model for the swelling response of polymer networks with non-covalent cross-linking bonds.
As opposed to the classical theories of rubber, we show that the uptake of water in polymer networks comprising hydrogen cross-linking bonds can lead to the dissociation of cross-links. This phenomenon leads to a reduction in the chain-density, an increase in entropy, and a decrease in the free energy. As a result, the network experiences significant softening and exhibits a different mechanical response.