Comportamiento de fases de membranas nanoestruturadas basadas en PVA, CS, H3PO2 y Nb2O5

Tarwin Duvan Zuñiga Rodriguez; Diego Peña Lara; Jesus Evelio Diosa Astaiza

doi:10.24050/reia.v17i34.1368

Phase behavior of nanostruturated membranes based on PVA, CS, H3PO2, and Nb2O5

10.24050/reia.v17i34.1368

Published 2020-11-01

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Phase behavior of nanostruturated membranes based on PVA, CS, H3PO2, and Nb2O5 (T. D. Zuñiga Rodriguez, D. Peña Lara, & J. E. Diosa Astaiza, Trans.). (2020). Revista EIA, 17(34), 1-7. https://doi.org/10.24050/reia.v17i34.1368

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Abstract

Thermal behavior (phase equilibria) of nanostructured membranes based on poly(vinyl alcohol) (PVA), chitosan (CS), hypophosphorous acid (H₃PO₂), nanoporous micro-particles of niobium oxide (Nb₂O₅) using Differential Scanning Calorimetric (DSC) and Thermogravimetry Analysis (TGA) techniques were studied. Membranes PVA-CS 80:20+40%H3PO2+xNb₂O₅with between x=0.02 and x=0.10 were prepared. For the DSC thermograms, the glass transition of PVA/CS 80:20 was observed at Tg~26°C, for PVA/CS 80:20+40%H₃PO₂at 95°C, and for those doped with Nb2O5 at 110°C. The melting point of PVA y PVA/CS 80:20 membranes was around 210°C, for PVA/CS 80:20+40%H₃PO₂is no clearly observed, indicating the dominance of their amorphous phase. For doped with Nb₂O₅, the melting of their crystalline phases was around 180°C. Above 430°C, all membranes break down. The TGA thermograms for all membranes showed a continuous weight loss as the temperature increased to 200°C, this loss is due to the absorbed water molecules at the membrane’s surface or caught inside of the polymer chains. Above 200°C, the membranes loss weight more quickly, being higher for the membranes without doping with Nb₂O₅, is observed.

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Authors

Tarwin Duvan Zuñiga Rodriguez

Universidad del Valle
Diego Peña Lara

Universidad del Valle

http://orcid.org/0000-0001-6199-1547 (unauthenticated)
Jesus Evelio Diosa Astaiza

Universidad del Valle

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Phase behavior of nanostruturated membranes based on PVA, CS, H3PO2, and Nb2O5