Scientific graph showing a colorful curve representing characteristic relaxation time (τ) influenced by temperature, thickness, and free volume, with β value 0.45-0.51. Abstract background.

generate a picture about by showing in a graph The τ (tau) value represents the characteristic relaxation time constant in a material, indicating the average time it takes for the system to relax or adjust to a new equilibrium state during processes like densification or structural relaxation. In the context of your PM6 film experiments, it reflects how quickly the film thickness stabilizes under isothermal conditions, influenced by factors like temperature, thickness, and free volume. The β (beta) value is the stretch exponent in the Kohlrausch-Williams-Watts (KWW) function, which describes the non-exponential, stretched relaxation behavior typical of glassy materials. A β value between 0 and 1 (e.g., 0.45–0.51 in your data) indicates the degree of deviation from a single exponential decay, with lower values suggesting broader distributions of relaxation times due to heterogeneous dynamics, such as varying segmental mobilities or interfacial effects in thin films. See more