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(a) Typical strass-strain relationship of Tetra-PEG gel and a fit by the neo-Hookean model (reproduced from Akagi et al. [16] with permission. Copyright 2011, ACS Publications). (b) The normalized elastic modulus (G/G af) as a function of the normalized polymer volume fraction (ϕ 0/ϕ∗) (Tetra-PEG gel 5k, rhombuses; 10k, circles; 20k, squares; 40k, triangles; reproduced from Akagi et al. [19] with permission. Copyright 2013, ACS Publications).
