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Polymers 2019, 11(3), 485;

A Phenomenological Approach to Study Mechanical Properties of Polymeric Porous Structures Processed Using Supercritical CO2

Department of Chemical Engineering, University of Salamanca, Plaza los Caídos s/n, 37008 Salamanca (SA), Spain
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy
Instituto de Investigación Biomédica de Salamanca, Hospital Virgen de la Vega, Paseo San Vicente, 58-182, 37007 Salamanca (SA), Spain
Authors to whom correspondence should be addressed.
These authors equally contributed to this work.
Received: 6 February 2019 / Revised: 6 March 2019 / Accepted: 11 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Supercritical Fluid Processing of Polymers)
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This work proposes a modeling of the mechanical properties of porous polymers processed by scCO2, using a phenomenological approach. Tensile and compression tests of alginate/gelatin and cellulose acetate/graphene oxide were modeled using three hyperelastic equations, derived from strain energy functions. The proposed hyperelastic equations provide a fair good fit for mechanical behavior of the nanofibrous system alginate/gelatin (deviations lower than 10%); whereas, due to the presence of the solid in the polymer network, a four-parameter model must be used to fit the composite cellulose acetate/graphene oxide behavior. Larger deviations from the experimental data were observed for the system cellulose acetate/graphene oxide because of its microporous structure. A finite element method was, then, proposed to model both systems; it allowed a realistic description of observable displacements and effective stresses. The results indicate that materials processed using scCO2, when submitted to large stresses, do not obey Hooke´s law and must be considered as hyperelastic. View Full-Text
Keywords: supercritical CO2; hyperelasticity; strain energy functions; Ogden; Yeoh supercritical CO2; hyperelasticity; strain energy functions; Ogden; Yeoh

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Tabernero, A.; Baldino, L.; Cardea, S.; Martín del Valle, E.; Reverchon, E. A Phenomenological Approach to Study Mechanical Properties of Polymeric Porous Structures Processed Using Supercritical CO2. Polymers 2019, 11, 485.

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