We have previously shown that the different molecular motions of a material can be tracked with temperature using THz-TDS . At low temperatures, in the glassy state, it is widely accepted that the motions of the system are restricted and confined to its local potential energy minimum. We define T g, as the temperature threshold at which the molecules have sufficient free volume and energy to escape their lowest energy configurational barrier and explore different conformational environments as the temperature increases further. Upon exceeding T g,↵ , the glass transition temperature, the mobility of the molecules can either: (1) continue to increase gradually, as the molecules keep on with exploring different conformational environments due to their inherent flexibility; or, (2) the molecular mobility of the system plateaus when the molecules happen to sample a sufficiently low energy conformation that is so stable that the molecule becomes trapped in an energy minimum that exceeds the available thermal energy. The slope m (Table ), corresponding to the changes in absorption coefficient with temperature, is directly linked to the molecular mobility of the system . For all the formulations that we have investigated we observed that the linear gradient in the region of T < T g, is typically lower compared to T g, < T < T g,↵ . At temperatures above T g,↵ we can broadly distinguish two types of observation for the change in absorption with temperature: either the gradient increases further (expected behaviour at high temperatures) or it decreases relative to the region of T g, < T < T g,↵ and remains relatively flat at high temperatures (indicating confinement of the molecular mobility).