Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Physical-Mechanical Behavior and Water-Barrier Properties of Biopolymers-Clay Nanocomposites

Version 1 : Received: 26 September 2021 / Approved: 28 September 2021 / Online: 28 September 2021 (12:27:17 CEST)

How to cite: Calambas, H.L.; Fonseca, A.; Adames, D.; Aguirre-Loredo, Y.; Caicedo, C. Physical-Mechanical Behavior and Water-Barrier Properties of Biopolymers-Clay Nanocomposites. Preprints 2021, 2021090471 (doi: 10.20944/preprints202109.0471.v1). Calambas, H.L.; Fonseca, A.; Adames, D.; Aguirre-Loredo, Y.; Caicedo, C. Physical-Mechanical Behavior and Water-Barrier Properties of Biopolymers-Clay Nanocomposites. Preprints 2021, 2021090471 (doi: 10.20944/preprints202109.0471.v1).

Abstract

The preparation of new materials based on starch for the development of biodegradable packaging is increasing, however, the poor properties of this biopolymer for this application causes an area of opportunities for the improvement of water vapour permeability (WVP), mechanical properties, thermal properties, hydrophilicity, water absorption, among others. Hence, starch has been combined with other polymers such as polyvinyl alcohol, which has shown an improvement in the mechanical properties of starch, also, the use of clays suggests that the properties of response to water can be improved. Therefore, in this work, the preparation and characterization of starch-PVA-nanoclay films prepared by solvent casting is reported. The results obtained suggest that the sonication of nanoclay is necessary to reach a good dispersion, which promotes a strong interaction among starch-PVA-nanoclay. In addition, the properties of WVP and mechanical properties of films improved with incorporation of nanoclay, the concentration of 0.5% w/v of nanoclay showed to be the best concentration due to concentrations of 1.0 and 1.5% w/v were poorer than 0.5% w/v. Accordingly, the successful incorporation of nanoclays into the matrix starch-PVA suggests that this material is a good candidate for use as packaging.

Keywords

Biodegradable polymers; Nanocomposite; Ultrasound-assisted; Mechanical properties; Montmorillonite

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