The Temperature Interval of the Liquid–Glass Transition of Amorphous Polymers and Low Molecular Weight Amorphous Substances

We present calculation results of the temperature interval δTg characterizing liquid–glass transition in amorphous materials obtained on basis available data empirical parameters C1 and C2 Williams–Landel–Ferry (WLF) viscosity equation. consider unambiguous dependence relative δTg/Tg fraction fluctuation volume fg frozen at glass Tg utilizing Sanditov’s model delocalized atoms. The parameter f = ΔVe/V, which determines molecular mobility characteristic atoms region, is weakly dependent nature most vitreous substances can be found as 1/C1. show that less than 1% for substances. This result conforms with Simon’s classical idea a small range structure freezes. structural relaxation time τg polymers chalcogenide glasses also calculated.