PMID: 15244578Jul 13, 2004Paper

Role of the density in the crossover region of o-terphenyl and poly(vinyl acetate)

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
A BarbieriD Leporini

Abstract

The coupling between the reorientation of molecular probes and the density in one low-molar mass glass former [ o -terphenyl (OTP)] and one polymer [poly(vinyl acetate) (PVAc)] is studied in the Goldstein's crossover region where the structural (alpha) and the secondary (beta) relaxations bifurcate. The coupling is found to be strong in OTP and virtually absent in PVAc. The probes sense both the alpha and beta relaxations, and locate their splitting accurately. It is concluded that the density affects the relaxation occurring in the crossover region of OTP but not of PVAc at subnanometer length scales. The findings are compared with recent assessments of the role of the molecular packing close and above the glass transition temperature T(g).

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Citations

Apr 17, 2016·The Journal of Chemical Physics·S Bernini, D Leporini
Apr 4, 2015·The Journal of Chemical Physics·S BerniniD Leporini
Jun 20, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Sunil P Singh, Shankar P Das
Aug 12, 2015·The European Physical Journal. E, Soft Matter·F Puosi, D Leporini
Nov 23, 2019·The European Physical Journal. E, Soft Matter·Antonio TripodoDino Leporini
Jan 20, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S BerniniD Leporini
Oct 15, 2008·Physical Review Letters·Th Voigtmann
Jul 21, 2009·The Journal of Physical Chemistry. B·Xuebang Wu, Zhengang Zhu

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