SI File.pdf

Biopolymers composed of polysaccharides are often used in various fields to either fully or partially replace synthetic polymers. Chitosan (CS), a linear polysaccharide, is mostly used in the field of packaging and medicine. The objective of this research was to investigate the feasibility of CS and poly(allylamine ‎hydrochloric acid) (PAH) blend films in terms of color, the presence of functional groups, ‎morphology, thermal stability, tensile strength (TS), and biodegradability for food packaging ‎applications. Four films namely, CPA-0 (100% CS), CPA-1 (90% CS/10% PAH), CPA-2 (80% CS/20% PAH), and CPA-3 (70% CS/30% PAH) were prepared and characterized. The films were characterized using UV/Vis, FT-IR, XRD, and DSC. The physical properties (grammage, thickness, density, and water solubility), optical properties (color and opacity), moisture barrier properties (WVTR and WVP), mechanical strength (% elongation, TS, and YM), thermal characteristics, and biodegradability were investigated to assess the potential of prepared films for their utilization in food packaging applications. It was observed that the film comprising 10% PAH (CPA-1) displayed relatively better mechanical properties, thermal stability, promising moisture barrier, biodegradability (100% within 14 days), and good color tones. CPA-1 exhibited maximum values of TS (83.62 MPa) and YM (2.9 GPa). UV/Visible spectroscopy showed that CPA-1 exhibited 80% transmittance in the visible region. DSC analysis indicated that CPA-1 exhibited an endothermic peak at a relatively high temperature of 130 °C, suggesting enhanced molecular stability of the CS matrix upon the addition of PAH. The results of the XRD analysis revealed a semi-crystalline structure featuring an orderly arrangement of the polymer, which was instrumental in imparting good mechanical properties. This study may pave the way for new possibilities in utilizing blend films as a viable option for food packaging.,多糖基生物聚合物常被应用于诸多领域，以完全或部分替代合成聚合物。壳聚糖（Chitosan，CS）作为一种线性多糖，主要应用于包装与医药领域。本研究旨在探究壳聚糖与聚烯丙基胺盐酸盐（poly(allylamine hydrochloride)，PAH）共混膜用于食品包装的可行性，考察指标涵盖色泽、官能团存在状态、形貌、热稳定性、拉伸强度（TS）及生物降解性能。共制备了CPA-0（100% CS）、CPA-1（90% CS/10% PAH）、CPA-2（80% CS/20% PAH）及CPA-3（70% CS/30% PAH）四种薄膜，并对其进行了表征。采用紫外-可见分光光度法（UV/Vis）、傅里叶变换红外光谱法（FT-IR）、X射线衍射法（XRD）及差示扫描量热法（DSC）对所得薄膜进行表征。为评估所制备薄膜用于食品包装的应用潜力，本研究考察了其物理性能（定量、厚度、密度与水溶性）、光学性能（色泽与不透明度）、防潮阻隔性能（水蒸气透过速率WVTR与水蒸气渗透系数WVP）、力学性能（伸长率、拉伸强度TS与杨氏模量YM）、热特性及生物降解性能。研究结果表明，添加10% PAH的CPA-1薄膜展现出相对更优异的力学性能、热稳定性、优良的防潮阻隔性能与生物降解性能（14天内完全降解），且色泽表现良好。CPA-1的拉伸强度（83.62 MPa）与杨氏模量（2.9 GPa）达到最大值。紫外-可见光谱分析显示，CPA-1在可见光区域的透光率可达80%。差示扫描量热分析结果显示，CPA-1在130 ℃的较高温度下出现吸热峰，表明添加PAH后壳聚糖基体的分子稳定性得到提升。X射线衍射分析结果显示，该共混膜呈现半结晶结构，聚合物排列有序，这有助于赋予薄膜良好的力学性能。本研究为将共混膜作为食品包装的可行方案开辟了新的应用路径。