Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV

Giacobazzi, Greta; Gioia, Claudio; Vannini, Micaela; Marchese, Paola; Guillard, Valérie; Angellier-Coussy, Hélène; Celli, Annamaria

doi:10.3390/polym13040524

Open AccessArticle

Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV

by

Greta Giacobazzi

¹,

Claudio Gioia

¹,

Micaela Vannini

¹

,

Paola Marchese

¹

,

Valérie Guillard

^2,*

,

Hélène Angellier-Coussy

²

and

Annamaria Celli

^1,*

¹

Department of Civil, Chemical, Environmental, and Materials Engineering, Alma Mater Studiorum/University of Bologna, Via Terracini 28, 40131 Bologna, Italy

²

Agropolymers Engineering & Emerging Technology, University of Montpellier—INRAE-SupAgro, 2 Place Pierre Viala, Bât 31, 34060 Montpellier, France

^*

Authors to whom correspondence should be addressed.

Polymers 2021, 13(4), 524; https://doi.org/10.3390/polym13040524

Submission received: 19 January 2021 / Revised: 5 February 2021 / Accepted: 6 February 2021 / Published: 10 February 2021

(This article belongs to the Section Biobased and Biodegradable Polymers)

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Abstract

The dynamic and equilibrium water vapor sorption properties of amorphous and highly crystalline poly(ethylene vanillate) (PEV) films were determined via gravimetric analysis, at 20 °C, over a wide range of relative humidity (0–95% RH). At low RH%, the dynamic of the sorption process obeys Fick’s law while at higher relative humidity it is characterized by a drift ascribable to non-Fickian relaxations. The non-Fickian relaxations, which are responsible for the incorporation of additional water, are correlated with the upturn of the sorption isotherms and simultaneously the hysteresis recorded between sorption and desorption cycles. The sorption isotherms of amorphous and highly crystalline PEV are arranged in the same concentration range of that of PET proving the similarity of the two polyesters. Water diffusion coefficients, whose determination from individual kinetic sorption/desorption curves required treatment with the Barens–Hopfenberg model, were demonstrated to be ≈10× higher for amorphous PEV compared to amorphous PET. Such a difference originates from the enhanced segmental flexibility of PEV chains.

Keywords: poly(ethylene vanillate); water sorption; water transport; diffusivity

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MDPI and ACS Style

Giacobazzi, G.; Gioia, C.; Vannini, M.; Marchese, P.; Guillard, V.; Angellier-Coussy, H.; Celli, A. Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV. Polymers 2021, 13, 524. https://doi.org/10.3390/polym13040524

AMA Style

Giacobazzi G, Gioia C, Vannini M, Marchese P, Guillard V, Angellier-Coussy H, Celli A. Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV. Polymers. 2021; 13(4):524. https://doi.org/10.3390/polym13040524

Chicago/Turabian Style

Giacobazzi, Greta, Claudio Gioia, Micaela Vannini, Paola Marchese, Valérie Guillard, Hélène Angellier-Coussy, and Annamaria Celli. 2021. "Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV" Polymers 13, no. 4: 524. https://doi.org/10.3390/polym13040524

APA Style

Giacobazzi, G., Gioia, C., Vannini, M., Marchese, P., Guillard, V., Angellier-Coussy, H., & Celli, A. (2021). Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV. Polymers, 13(4), 524. https://doi.org/10.3390/polym13040524

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Water Vapor Sorption and Diffusivity in Bio-Based Poly(ethylene vanillate)—PEV

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