Fig. 4 Schematic illustration of the pH-mediated reorganization of the interchain hydrogen bond network of the PSPMA brushes. Schematic illustration of the pH-mediated reorganization of the interchain hydrogen bond network of the PSPMA brushes. As pH increases, the interchain hydrogen bonds are broken between the grafted chains due to the desorption of hydronium from the PSPMA brushes. For clarity, the Cl−, OH−, and excess free K+ and H3O+ within the PSPMA brushes are not depicted in this figure. Bo Wu et al. Sci Adv 2016;2:e1600579 Copyright © 2016, The Authors