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A Phenomenological Approach to Study Mechanical Properties of Polymeric Porous Structures Processed Using Supercritical CO(2)

This work proposes a modeling of the mechanical properties of porous polymers processed by scCO(2), 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 fu...

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Detalles Bibliográficos
Autores principales: Tabernero, Antonio, Baldino, Lucia, Cardea, Stefano, Martín del Valle, Eva, Reverchon, Ernesto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6473646/
https://www.ncbi.nlm.nih.gov/pubmed/30960469
http://dx.doi.org/10.3390/polym11030485
Descripción
Sumario:This work proposes a modeling of the mechanical properties of porous polymers processed by scCO(2), 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 scCO(2), when submitted to large stresses, do not obey Hooke´s law and must be considered as hyperelastic.