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Water Adsorption Thermodynamical Analysis and Mechanical Characterization of Chitosan and Polyvinyl Alcohol-Based Films

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Abstract

Chitosan and polyvinyl alcohol films were prepared by the casting method. Moisture adsorption isotherms were obtained at 15 °C, 20 °C, 25 °C and 30 °C. Experimental isotherms were well fitted using the GAB model (E < 10%). The thermodynamic analysis showed a minimum integral entropy (∆Sint) at the 0.3–0.6 range of water activity (aw) in all films. Pore radius values of the films ranged from 1.005 nm to 20.766 nm, which correspond to the micropores and mesopores classification. Compensation enthalpy-entropy in films showed that the water vapor adsorption process was driven by enthalpy at low aw values (0.3–0.5 for CS and 0.2–0.3 for PVA). Most of the mechanical properties showed constant values at the zone of minimum ∆Sint, confirming that thermodynamic properties could be used to predict the stability of films. The study of thermodynamic water adsorption and the mechanical properties allows understanding the preparation process of stable films with adequate parameters intended for food packaging materials.

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Authors and Affiliations

  1. Departamento de Procesos de Polimerización, CONACyT-CIQA, Blvd. Enrique Reyna Hermosillo 140, Saltillo, Coahuila, 25294, México

    Rocio Y. Aguirre-Loredo

  2. CICATA, Unidad Querétaro, Instituto Politécnico Nacional, Cerro Blanco 141, Colinas del Cimatario, CP 76090, Santiago de Querétaro, México

    Gonzalo Velazquez

  3. Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esq. Paseo Tollocan S/N, Col. Residencial Colón, CP 50120, Toluca, Estado de México, México

    Andrea Y. Guadarrama-Lezama

  4. Centro de Investigaciones Biomédicas, Universidad Veracruzana, Doctor Castelazo Ayala S/N, Industrial Animas, 91190, Xalapa Enríquez, Veracruz, México

    Rubi Viveros-Contreras

  5. Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Lientur 1457, 4080871, Concepción, Chile

    Johanna Castaño

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  1. Rocio Y. Aguirre-Loredo
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RYAL: Conceptualization; Resources; Methodology; Software; Validation; Investigation; Writing—Original Draft; Writing—Review & Editing; Visualization; Supervision; Project administration. G V: Conceptualization; Resources; Writing—Original Draft; Project administration; Funding acquisition. Validation; Formal analysis. AYGL: Conceptualization; Data Curation; Writing—Original Draft; Writing—Review & Editing; Visualization; Supervision. RVC: Conceptualization; Data Curation; Writing—Original Draft; Writing—Review & Editing; Visualization; Supervision; Validation; Formal analysis. JC: Conceptualization; Data Curation; Writing—Original Draft; Writing—Review & Editing; Visualization; Supervision. Validation; Formal analysis.

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Aguirre-Loredo, R.Y., Velazquez, G., Guadarrama-Lezama, A.Y. et al. Water Adsorption Thermodynamical Analysis and Mechanical Characterization of Chitosan and Polyvinyl Alcohol-Based Films. J Polym Environ 30, 1880–1892 (2022). https://doi.org/10.1007/s10924-021-02316-x

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