Impact of additives on mechanical and barrier properties of starch‐based films plasticized with deep eutectic solvents

Abstract

The aim of this work was to prepare starch‐based films plasticized with two and three‐component deep eutectic solvents (DES) in the presence of different additives: aluminosilicates (sodium and calcium montmorillonite), microcrystalline cellulose, and tannin; and to investigate their influence on mechanical and barrier properties of the films. Mutual interactions between polysaccharide matrix, plasticizer, and additive were investigated by Fourier transform infrared (FTIR) spectroscopy. Two types of starches were used: native potato starch (TPS) and hydroxypropylated, oxidized potato starch (HOPS). The two‐component DES CC:G consisted of choline chloride (CC) and glycerol (G), whereas the three‐component DES with crosslinking activity CCit:U:G, included choline citrate (CCit), urea (U), and glycerol. For the TPS/CCit:U:G films an improvement of the mechanical and barrier properties was obtained after introduction of additives, whereas for TPS/CC:G only a slight decrease in water vapor transmission rate was observed, without any significant improvement in mechanical properties. Moreover, the mechanical test results, FTIR spectra, and the oxygen transmission rate values revealed that the clays interacted with plasticizer components, thereby hindering crosslinking reactions between plasticizer and starch.

Deep Eutectic Solvents for Starch Treatment

“…It was shown that a glycerol imidazole mixture modified the surface of the wood fibres and exhibited better adhesion than the other plasticizers presented in this work. Zdanowicz and Johannson [35] used potato starch plasticized with two or three component DESs to obtain composites with various natural fillers: sodium and calcium montmorillonite, nitrocellulose and tannin. Starch-based films were prepared via the casting method.…”

Use of Ionic Liquids and Deep Eutectic Solvents in Polysaccharides Dissolution and Extraction Processes towards Sustainable Biomass Valorization

“…In summary, only few works have focused so far on starch dissolution with DESs. A primary focus has been given towards the study of the plasticization of starch with these solvents to improve the mechanical properties of thermoplastic polymers [ 222 , 223 ]. However, an increasing knowledge behind starch dissolution mechanisms in DESs is expected to come in the near future.…”

Deep Eutectic Solvents in the Production of Biopolymer-Based Materials

“…Preparation of starch-based films with DESs and different additives (sodium and calcium montmorillonite, tannin and microcrystalline cellulose) was performed by Zdanowicz and Johansson. [38] In film preparation, two different DESs are used (ChCl : glycerol and CCit : urea : glycerol) combined with starch and various mentioned additives. Elongation at break for films containing ChCl : glycerol was in the range from 29.2 to 78.5 % while much lower values were noticed in the case of films with CCit : urea : glycerol (5.1 -29.7 %).…”