聚乙烯醇/淀粉/凤仙透骨草提取物复合膜制备及性能

以聚乙烯醇(Polyvinyl alcohol,PVA)、淀粉(Starch,ST)为原料,凤仙透骨草提取物(Impatiens balsamina extract,IBE)为抗菌剂,通过共混法制备抗菌复合膜,通过FTIR、XRD、SEM和热重分析对复合膜的形貌和结构进行表征及对力学、光学、阻隔、抑菌等性能测试分析。结果表明,IBE与PVA/ST基膜复合良好,制备的PVA/ST/IBE抗菌复合膜对大肠杆菌、白色葡萄球菌和枯草杆菌具有良好的抑菌作用,抑菌性能随着IBE含量的增加而逐渐提高；同时具有良好的力学强度,IBE添加量为12.5 mL的复合膜拉伸强度达到22.97±0.68 MPa,断裂伸长率相比PVA/ST基膜提升了79.22%；透明度有所下降,透光率下降了11.90%；氧气阻隔性能良好,氧气透过系数为1.771±0.196×10_-12 ^cm₃^.cm/(cm₂^.s.Pa),在环保包装、食品保鲜等领域具有广阔的应用前景。

Preparation and performance of polyvinyl alcohol/starch/impatiens balsamina extract antibacterial composite film

Antibacterial composite film was prepared by blending polyvinyl alcohol (PVA) and starch (ST) as raw materials and impatiens balsamina extract (IBE) as antibacterial agent. The morphology and structure of the composite film were characterized by Fourier Transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis, and the mechanical, optical, barrier and antibacterial properties were tested and analyzed. The results showed that IBE was well combined with PVA/ST base film. The prepared PVA/ST/IBE antibacterial composite film had good antibacterial effect on Escherichia coli, Staphylococcus albus and Bacillus subtilis, and the antibacterial performance increased with the increase of IBE content. At the same time, PVA/ST/IBE film had good mechanical strength. The tensile strength of the composite film with 12.5 mL of IBE added reached 22.97±0.68 MPa, the elongation at break increased by 79.22% compared with the PVA/ST base film and transparency decreased by 11.90%; Antibacterial composite film had good oxygen barrier performance, the oxygen transmission coefficient was 1.771±0.196×10_-12 ^cm₃^.cm/(cm₂.s.Pa), had broad application prospects in environmental protection packaging, food preservation and other fields.