“…The gradual, temperaturedependent change in the physical state of the polymer that occurs at T g , from solid glass to supercooled liquid (Figure 11) or vice versa, is accompanied by equally gradual changes in several, temperature dependent physical, mechanical, thermal, electrical, etc., properties of the substrate (eg density, volume, specific heat, modulus, viscosity, enthalpy, etc.). As these changes in the thermodynamic (eg enthalpy, heat capacity), mechanical (modulus, viscosity), dielectric (dielectric constant), etc., properties of the substrate can be detected using various techniques, so a wide range of different experimental methods can be used to determine the range of temperature that corresponds to Tg, such as Differential Scanning Calorimetry (DSC), Thermomechanical Analysis (TMA) Dynamic Mechanical Analysis (DMA), Dielectric Analysis (DEA) and Electron Spin Resonance (ESR) (eg, 272,[281][282][283][284][285][286][287][288][289][290] ).…”