Dielectric properties of vapor-deposited propylbenzenes

Birte Riechers, A. Guiseppi-Elie, Mark Donovan Ediger, Ranko Richert

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Dielectric susceptibility data of vapor-deposited films of iso-propylbenzene (IPB) and n-propylbenzene (NPB) have been recorded across a wide range of deposition temperatures, Tdep, mostly below the glass transition temperature, Tg. The results for the real and imaginary components of dielectric susceptibility are compared with recently published results for 2-methyltetrahydrofuran (MTHF). Common to all three systems are the following: (i) increased kinetic stability seen as higher onset temperature for the transformation to the liquid state for Tdep ≈ 0.85Tg; (ii) the reduction of the dielectric loss (χ″) for as-deposited glasses, a signature of increased packing density that is maximal for Tdep ≈ 0.85Tg; and (iii) a reduced level of the storage component (χ′) for as-deposited glasses, an effect that is almost deposition temperature invariant for Tdep < Tg. Material specific behavior is observed when heating the as-deposited films to 1.2Tg: IPB and NPB transform directly into the ordinary liquid state if judged on the basis of dielectric susceptibility, whereas MTHF has been reported to enter an unusual liquid state prior to a liquid-liquid transition at higher temperatures. These results are discussed in the context of the curious scattering results reported by Ishii et al. for some benzene derivatives, which hint at a liquid-liquid transformation.
TidsskriftJournal of Chemical Physics
Udgave nummer17
StatusUdgivet - 2019

Bibliografisk note

Important note from the Publisher regarding the attached version of the article: “This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Riechers, B., Guiseppi-Elie, A., Ediger, M. D., & Richert, R. (2019). Dielectric properties of vapor-deposited propylbenzenes. Journal of Chemical Physics, 151(17). https://doi.org/10.1063/1.5125138 and may be found at https://aip.scitation.org/doi/abs/10.1063/1.5125138

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