Department of Fiber System Engineering, Yeungnam University, South Korea.
Department of Food Science and Technology, Yeungnam University, South Korea.
Int J Biol Macromol. 2021 Jul 1;182:1301-1309. doi: 10.1016/j.ijbiomac.2021.05.060. Epub 2021 May 11.
Agar/polyacrylamide/quaternary ammonium silane-based (A/P/QAS-based) composite films were developed for food and biomedical packaging applications. The structural, optical, and surface morphological properties of the A/P and A/P/QAS composites were characterized by various characterization techniques in terms of thermogravimetric analysis, differential scanning calorimetry analyses, mechanical and rheological properties. Results showed that the 5% gravimetric loss (57.8-139.1 °C), glass transition temperature (179-189.9 °C) and tensile strength (35.2-47.8 MPa) of the prepared composites increased with increasing polyacrylamide content. The contact angle and water barrier properties of the composites were considerably improved by the addition of QAS. To compare WVP values of the A/P/QAS composite with neat AP composite films it reduced nearly 46% (2.45 to 1.32 × 10 g/m Pas). The A/P/QAS composites showed excellent antimicrobial properties against five different organisms. The Staphylococcus aureus exhibited highest 25 mm for gel and 18.1 mm for film of A/P/QAS composites. All the composites exhibited shear-thinning behavior, and their viscosity increased with increasing polyacrylamide content. The storage moduli of the prepared hydrogel composites were in the range of 5000-10,600 Pa at 1 rad/s and increased continuously over the entire frequency range. The dynamic rheological properties of A/P and A/P/QAS composites indicated that the prepared composites had good mechanical strength. Biopolymer based A/P and A/P/QAS composite films are suitable for green composite packaging applications.
基于琼脂/聚丙烯酰胺/季铵硅烷的（A/P/QAS 基）复合薄膜因其在食品和生物医学包装方面的应用而被开发出来。通过热重分析、差示扫描量热分析、机械和流变性能等各种表征技术对 A/P 和 A/P/QAS 复合材料的结构、光学和表面形貌特性进行了表征。结果表明，随着聚丙烯酰胺含量的增加，复合材料的 5%重量损失（57.8-139.1°C）、玻璃化转变温度（179-189.9°C）和拉伸强度（35.2-47.8 MPa）均有所提高。添加 QAS 可显著改善复合材料的接触角和耐水性。与纯 AP 复合薄膜相比，A/P/QAS 复合薄膜的水蒸气透过率（WVP）值降低了近 46%（2.45 至 1.32×10 g/m Pas）。A/P/QAS 复合材料对五种不同的微生物表现出优异的抗菌性能。其中，金黄色葡萄球菌在凝胶和薄膜上的抑菌圈直径分别高达 25mm 和 18.1mm。所有的复合材料均表现出剪切稀化行为，其粘度随聚丙烯酰胺含量的增加而增加。所制备的水凝胶复合材料的储能模量在 1 rad/s 时的范围为 5000-10600 Pa，并在整个频率范围内持续增加。A/P 和 A/P/QAS 复合材料的动态流变性能表明，所制备的复合材料具有良好的机械强度。基于生物聚合物的 A/P 和 A/P/QAS 复合薄膜适用于绿色复合包装应用。
