The thickness-dependent elastic modulus of PS thin films at T = 295 K. The symbols circle and square are the experiment results for molar weight M
w = 1800 and 114 kg/mol, respectively . The solid curve is plotted with the calculation results obtained from Equation 3, where the parameters that determine the T
g(h) in Equation 4 are c = 1/2, h
0 = 5 nm, ΔC
pb = 30.7 J mol-1 K-1 = 1.919 J g atom-1 K-1, and T
gb = 375 K .