A New Approach to the Justification of the Wolkenstein–Ptitsyn Formula for the Parameter of the Vitrification Equation

Abstract

An extended interpretation of the Wolkenstein–Ptitsyn formula for temperature band δT_g, characterizing a range of transition from liquid to glass, is considered using the Razumovskaya–Bartenev concept. The derivation of this formula proposed by the authors does not depend on the specific type of temperature dependence of relaxation time. For silicate glasses, calculation δT_g by this formula agrees with the calculation by the Williams–Landel–Ferry relation and with the left side of glass transition equation qτ_g = δT_g, where q is the cooling rate and τ_g is relaxation time. Based on the experimental data, the calculation of parameters of the Razumovskaya–Bartenev equation for silicate glasses and amorphous polymers is carried out for the first time.