However, critical values of the storage modulus E′ 1 − E′4 can be determined from the E′(T) DMA curve (Figure 1), the transition temperatures Tα, Tβ, Tγ from the local maxima of the tan δ(T) curve (Figure 1) and the flow temperature Tf from the onset of the constant value of E′ on the E′(T) curve (Figure 1).