Abstract The mechanical, thermal, and barrier properties of tapioca starch films produced using a solvent casting method with varying concentrations of chitosan nanoparticles (CNPs; 5, 10, 15, 20, 25, 30, 35% w/w of solid starch) were investigated. The addition of 15% w/w CNP (size range: 20–50 nm) to the starch films (starch/CNP films) enhanced the tensile strength from 1.12 to 10.03 MPa (7.96-fold increment) and elongation at break from 67.00 to 90.77% (0.35-fold increment). However, the thermal stability of the starch films reduced slightly whereby the maximum degradation temperature decreased from 316.32 to 289.11°C (0.09-fold decrement) with the addition of CNP. The opacity of 15% w/w starch/CNP films increased from 8.07 to 14.67 due to the presence of CNP within the starch matrix that hinders the light transmission pass through the film. Furthermore, reductions in the water vapor permeability from 1.1 × 10−11 to 0.63 × 10−11 g/Pa h m (4-fold increment) and oxygen permeability from 7.38 × 10−3 to 3.59 × 10−3 cm3/m day Pa (0.51-fold increment) of the films were observed. Starch/CNP films fabricated in this work exhibit enhanced the mechanical and barrier properties, thus proving the promising potential to be employed as food packaging materials.

中文翻译：

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与壳聚糖纳米粒子结合的淀粉膜的机械、热和阻隔性能

摘要使用溶剂浇铸法生产的木薯淀粉薄膜的机械、热和阻隔性能具有不同浓度的壳聚糖纳米颗粒（CNP；5、10、15、20、25、30、35% w/w 的固体淀粉）。进行了调查。在淀粉膜（淀粉/CNP 膜）中添加 15% w/w CNP（尺寸范围：20-50 nm）可将拉伸强度从 1.12 提高到 10.03 MPa（增量 7.96 倍），将断裂伸长率从 67.00 提高到90.77%（0.35 倍增量）。然而，淀粉膜的热稳定性略有降低，因此随着 CNP 的添加，最大降解温度从 316.32 降低到 289.11°C（降低 0.09 倍）。15% w/w 淀粉/CNP 薄膜的不透明度从 8.07 增加到 14。67 由于淀粉基质中存在阻碍光透射穿过薄膜的 CNP。此外，水蒸气渗透率从 1.1 × 10-11 降低到 0.63 × 10-11 g/Pa h m（4 倍增量），氧气渗透率从 7.38 × 10-3 降低到 3.59 × 10-3 cm3/m day Pa观察到薄膜的（0.51 倍增量）。在这项工作中制造的淀粉/CNP 薄膜表现出增强的机械和阻隔性能，从而证明了用作食品包装材料的广阔潜力。