Mass transfer kinetics of CO2 and eugenol in the supercritical impregnation of polyamide fibers: Experimental data and modeling

[Display omitted] •CO2 and eugenol diffusion in PA6 at supercritical conditions showed Fickian behavior.•Eugenol loading and partition coefficients were enhanced by temperature.•Apparent diffusivities of CO2 and eugenol were approx. 10-10 and 10−14 m2s-1, respectively.•CO2 sorption in PA6 was not af...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2020-12, Vol.166, p.105030, Article 105030
Main Authors: Mosquera, José E., Goñi, María L., Martini, Raquel E., Gañán, Nicolás A.
Format: Article
Language:English
Subjects:
Diffusion coefficient
Eugenol
Impregnation
Polyamide
Supercritical carbon dioxide
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Summary:[Display omitted] •CO2 and eugenol diffusion in PA6 at supercritical conditions showed Fickian behavior.•Eugenol loading and partition coefficients were enhanced by temperature.•Apparent diffusivities of CO2 and eugenol were approx. 10-10 and 10−14 m2s-1, respectively.•CO2 sorption in PA6 was not affected by temperature nor pressure.•Results suggested that eugenol diffuses in an already plasticized polymeric matrix.•The high pressure process had a low impact on the crystallinity degree of PA6 fibers. In this work, mass transfer kinetics of CO2 and eugenol into polyamide 6 (PA6) fibers under supercritical conditions were investigated in the context of the development of a functional dental floss for dental care applications using scCO2-assisted impregnation. The sorption kinetics was evaluated at different temperature (40 and 60 °C) and pressure conditions (10 and 12 MPa), measuring the total amount of CO2 and eugenol incorporated in PA6 fibers after certain time intervals (from 30 min to 4 h). Equilibrium sorption was determined for all operation conditions, obtaining the highest values at low CO2 density. Diffusion coefficients of CO2 and eugenol under different process conditions were estimated fitting the experimental data with analytical solutions of the second Fick’s law. In addition, thermal behavior of eugenol-loaded PA6 fibers impregnated at different time intervals was evaluated by differential scanning calorimetry (DSC), observing only small changes in the polymer crystallinity during the high-pressure process.
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2020.105030