Horvat Gabrijela, Žvab Klara, Knez Željko, Novak Zoran
Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ul.17, 2000 Maribor, Slovenia.
Faculty of Medicine, University of Maribor, Taborska Ulica 8, 2000 Maribor, Slovenia.
Polymers (Basel). 2022 Jun 14;14(12):2399. doi: 10.3390/polym14122399.
In this research, ethyl cellulose films were prepared by a simple, easy, controlled one-pot method using either ethanol or ethyl lactate as solvents, the films being formed at 6 °C. Titanium dioxide nanoparticles were incorporated to improve the oxygen transmission and water vapour transmission rates of the obtained films. This method used no plasticizers, and flexible materials with good mechanical properties were obtained. The resulting solvent-free and transparent ethyl cellulose films exhibited good mechanical properties and unique free-shapable properties. The obtained materials had similar properties to those reported in the literature, where plasticizers were incorporated into ethyl cellulose films with an elastic modulus of 528 MPa. Contact angles showed the hydrophobic nature of all the prepared materials, with contact angles between 80 and 108°. Micrographs showed the smooth surfaces of the prepared samples and porous intersections with honeycomb-like structures. The oxygen and water vapor transmission rates were the lowest for the ethyl cellulose films prepared in ethyl lactate, these being 615 cm·m·day and 7.8 gm·day, respectively, showing that the films have promise for food packaging applications.
在本研究中，采用简单、易行、可控的一锅法，以乙醇或乳酸乙酯为溶剂，在6℃下制备乙基纤维素薄膜。加入二氧化钛纳米颗粒以提高所得薄膜的氧气透过率和水蒸气透过率。该方法不使用增塑剂，获得了具有良好机械性能的柔性材料。所得无溶剂透明乙基纤维素薄膜具有良好的机械性能和独特的可自由成型性能。所获得的材料具有与文献报道相似的性能，文献中增塑剂被加入到弹性模量为528MPa的乙基纤维素薄膜中。接触角表明所有制备材料均具有疏水性，接触角在80°至108°之间。显微照片显示制备样品表面光滑，具有蜂窝状结构的多孔交叉点。在乳酸乙酯中制备的乙基纤维素薄膜的氧气和水蒸气透过率最低，分别为615cm·m·天和7.8g·m·天，表明这些薄膜在食品包装应用方面具有前景。
