11 pags., 10 figs. 2 tabs. -- This article is part of the Research Topic Structure-Functional Property Relationship in Polymeric MaterialsThis article presents an experimental study on the relaxation dynamics of a series of random copolymers based on bio-friendly comonomers with interesting gas barrier properties. We analyze the relaxation response in the glassy and ultraviscous regime of poly (trimethylene furanoate/sebacate) random copolymers via dielectric spectroscopy. We report lower values of dynamic fragility [a dimensionless index introduced in 1985 (Angell, Relaxations in Complex Systems, 1985)] in comparison to popular polyesters widely used in industry, such as poly (ethylene terephthalate), suggesting that the amorphous phase of these furanoate-based polyesters adopt an efficient chain packing. This is consistent with their low permeability to gases. We also discuss on different equations (phenomenological and theory-based approaches) for fitting the temperature-evolution of the alpha relaxation time.This publication is supported by COST Action FUR4Sustain, an European network of FURan based chemicals and materials FOR
a Sustainable development, CA18220, supported by COST (European Cooperation in Science and Technology).
AlS’contract was financed by the Spanish AEI through the grant PTA2019-016903-I
