聚乙烯醇/淀粉/凤仙透骨草提取物复合膜的制备及性能

Preparation and properties of polyvinyl alcohol/starch/Impatiens balsamina extract antibacterial composite films

以聚乙烯醇(PVA)、淀粉(ST)为原料,以凤仙透骨草提取物(IBE)为抗菌剂,通过共混法制备PVA/ST/IBE抗菌复合膜。使用FTIR、XRD、SEM和TG对样品的形貌和结构进行了表征,并对其力学、光学、阻隔、抑菌性能进行了测试。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芽孢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;PVA/ST/IBE抗菌复合膜具有良好的力学强度和阻光性能,IBE添加量为12.50 mL[以PVA/ST基膜质量(5 g)计,下同]的PVA/ST/IBE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%,透光率下降了11.90%;PVA/ST/IBE抗菌复合膜氧气阻隔性能良好,氧气透过系数为(17.713±1.960)×10^(–13)cm^(3)·cm/(cm^(2)·s·Pa)。

PVA/ST/IBE antibacterial composite films were synthesized from blending of polyvinyl alcohol(PVA),starch(ST)and Impatiens balsamina extract(IBE),characterized by FTIR,XRD,SEM and TG for analyses on morphology and structure,and further evaluated for mechanical,optical,barrier and antibacterial properties.The characterization results showed that IBE was well combined with PVA/ST base film.The PVA/ST/IBE composite films obtained exibited good antibacterial activity against Escherichia coli,Staphylococcus albus and Bacillus subtilis,with the antibacterial performance improved with the increase of IBE content.Meanwhile,the composite films displayed good mechanical strength and light resistance.The tensile strength of the composite film with IBE additive amount of 12.50 mL[based on the mass of PVA/ST base film(5 g),the same below]reached(22.97±0.68)MPa,the elongation at break increased by 79.22%and transparency decreased by 11.90%compared with those of the PVA/ST base film.PVA/ST/IBE antibacterial composite film showed good oxygen barrier performance,with a oxygen transmission coefficient of(17.713±1.960)×10^(-13)cm^(3)·cm/(cm^(2)·s·Pa).