Fig. 2. Experimental data for the Poisson's ratio ν of two bulk PNIPAM gels with different fractions of crosslinkers, measured by Hirotsu et al.47 For temperatures below Tθ the network is swollen and the ratio ν approaches 1/4 as described in the main text. On the other hand, for T > Tθ we observe ν → 1/2 as the collapsed gel shows a rubber-like (incompressible) strain response. In this plot we used Tθ = 33.8 °C and Tθ = 33.3 °C for the data corresponding to the circles and the squares, respectively.
