Thermodynamic Scaling of Polymer Dynamics versus T - Tg Scaling

Jiaxi Guo, Sindee Simon

Research output: Contribution to journalArticle

Abstract

A thermodynamic scaling law for the relaxation times of complex liquids as a function of temperature and volume has been proposed in the literature: τ (T,V) = f (TV^γ ), where γ is a material-dependent constant. We test this scaling for six materials, linear polystyrene, star polystyrene, two polycyanurate networks, poly(vinyl acetate), and poly(vinyl chloride), and compare the thermodynamic scaling to T – Tg scaling, where τ = f (T – Tg). The thermodynamic scaling law successfully reduces the data for all of the samples; however, polymers with similar structures but different glass transition (Tg) and pressure-volume-temperature (PVT) behavior, i.e., the two polycyanurates, cannot be superposed unless the scaling law is normalized by TgVg^γ . On the other hand, the T – Tg scaling successfully reduced data for all polymers, including those having similar microstructures. In addition, the T – Tg scaling is easier to implement since it does not require knowledge of the PVT behavior of t
Original languageEnglish
Pages (from-to)074901 (1-7)
JournalJournal of Chemical Physics
StatePublished - Aug 18 2011

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