Adapting gravimetric sorption analyzer to estimate water vapor diffusivity in micrometric size cellulose particles

Thoury-Monbrun, Valentin; Gaucel, Sébastien; Gontard, Nathalie; Guillard, Valérie; Angellier‐Coussy, Hélène

doi:10.1007/s10570-019-02661-0

Cited by 3 publications

(3 citation statements)

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“…Mass evolution was carried out on circular samples of about 0.5 cm 2 and 15 mg, deposited directly on the pan. It was considered as a plane sheet with diameter to half thickness ratio above 10 that is enough to neglect boundary effect [ 14 , 15 ]. Therefore, diffusion occurs from the upper side to the lower side, orthogonal in the thickness of the material without side effect.…”

Section: Methodsmentioning

confidence: 99%

“…Considering an isotropic diffusion problem in a plan sheet of material of thickness L (m), insulated at its bottom, the diffusion problem reduces to a pure monodirectional diffusion, well defined by Equation (4) given by Crank [ 20 ]:

where D (m 2 s −1 ) is the Fickian diffusion coefficient averaged over the concentration interval. For more details about underlying equations, readers may refer to the work of Thoury-Monbrun et al [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

“…where D (m 2 s −1 ) is the Fickian diffusion coefficient averaged over the concentration interval. For more details about underlying equations, readers may refer to the work of Thoury-Monbrun et al [15]. D is identified from transient data of each RH steps: therefore, one D value is obtained for each RH investigated.…”

Section: Diffusion In a Homogeneous Plane Sheet Of Materialsmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Methodsmentioning

confidence: 99%