Vogel-Fulcher-Tamman-Hesse equation

VFTH Vogel, Fulcher, Tamman, Hesse equation... [Pg.252]

The parameters for P4tBCHM are summarized in Table 2.6 The temperature dependence of the a relaxation in the frequency domain can be conveniently analyzed by means of the Vogel-Fulcher-Tamman-Hesse (VFTH) equation [88-90] which was empirically formulated as ... [Pg.77]

On the other hand, as in the analysis of the previous systems the temperature dependence of the a relaxation follow the Vogel-Fulcher-Tamman-Hesse (VFTH) [88-90], The 7% values obtained are 337 5 and 274 5 for PBCHM and PBCHMM respectively. By this way and using equation (2.31) the m parameter obtained are 1579 and 1804 and the relative free volumes at Tg are 3.2 and 2.6% for PCBuM and PCHBMM, respectively, in good agreement with the free volume theory. [Pg.91]

The WLF relation was an extension of the Vogel-Tamman-Fulcher (VTF) empirical equation (Vogel, 1921 Tamman and Hesse, 1926 Fulcher, 1925) which was originally formulated to describe the properties of supercooled liquids and, given in its original form, is... [Pg.131]

At the time of development of free volume theory, two important empirical equations of viscosity were known. They are the Doolittle (1951) equation (3.01) and the Vogel, Tamman and Fulcher (VTF) equation (3.02) (Vogel, 1921, Fulcher, 1923, Tammann and Hesse, 1926), which are given below. [Pg.77]

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