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Connecting 1D and 2D Confined Polymer Dynamics to Its Bulk Behavior via Density Scaling

par Adrjanowicz, Karolina;Winkler, Roksana;Dzienia, Andrzej;Paluch, Marian;Napolitano, Simone
Référence ACS macro letters, 8, 3, page (304-309)
Publication Publié, 2019-03-01

Article révisé par les pairs

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Résumé :

Under confinement, the properties of polymers can be much different from the bulk. Because of the potential applications in technology and hope to reveal fundamental problems related to the glass-transition, it is important to realize whether the nanoscale and macroscopic behavior of polymer glass-formers are related to each other in any simple way. In this work, we have addressed this issue by studying the segmental dynamics of poly(4-chlorostyrene) (P4ClS) in the bulk and upon geometrical confinement at the nanoscale level, in either one- (thin films on Al substrate) or two- (within alumina nanopores) dimensions. The results demonstrate that the segmental relaxation time, irrespective of the confinement size or its dimensionality, can be scaled onto a single curve when plotted versus γ /T with the same single scaling exponent, γ = 3.1, obtained via measurements at high pressures in bulk. The implication is that the macro- and nanoscale confined polymer dynamics are intrinsically connected and governed by the same underlying rules.