Fig. 5
From: Linear elasticity of polymer gels in terms of negative energy elasticity
Experimental evidence for the existence of negative energy elasticity in a polymer gel. All panels show the temperature (T) dependence of the shear modulus G. We obtain each gray line from a least-square fit of each sample, which is characterized by the three parameters of the precursors: the molar mass M, the concentration c and the connectivity p. All gray lines that have the same M and c pass through a vanishing temperature T0 on the T axis, which leads to Eq. (7). The value of T0 in each graph is the average of the four samples with different values of p, and the values in parentheses represent the standard deviation. (Reprinted from ref.  [1]; CC BY 4.0.)
