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The relationship between the connectivity of the polymer network at the critical gelation point (p∗) and the normalized polymer volume fraction (ϕ 0/ϕ∗) of Tetra-PEG gel. The solid line represents the prediction of the site-bond percolation model. (reproduced from Sakai et al. [30] with permission. Copyright 2016, The Society of Polymer Science, Japan (SPSJ)).
