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摘要
作为一种价格低廉、来源广泛的天然高分子原料,淀粉具有良好的成膜性、热塑性,是制备膜材料的合适基材。但是,淀粉膜存在吸湿性强、质地硬脆等缺陷,引入合适的组分对淀粉基膜材料进行改性可以解决上述问题。以碱性木质素(AL)为增韧材料,1-氯-2,2,5,5-四甲基-4-咪唑啉酮(MC)为抗菌剂,采用简单的溶液浇铸法制备了具有优异紫外屏蔽和抗菌性能的淀粉/碱性木质素卤胺(ST/AL-MC)抗菌复合膜,通过傅里叶变换红外光谱仪、扫描电子显微镜、热重分析仪对抗菌复合膜的结构、微观形貌和热稳定性进行表征,并测试了其机械性能、紫外屏蔽性能和抗菌性能。结果表明:ST/AL-MC抗菌复合膜显示出极好的抗菌效果,可在接触1min内分别灭活80.65%的大肠杆菌和97.33%的金黄色葡萄球菌,接触5min内可以杀灭99.99%的大肠杆菌和金黄色葡萄球菌;含质量分数10% AL的抗菌复合膜断裂延伸率达到81.30%,韧性为1.07MJ/m3,与纯淀粉膜相比分别提高了342%和89%,延展性和韧性大幅度提升;抗菌复合膜可以屏蔽几乎100%的中波紫外线(275～320nm)、短波紫外线(200～275nm)以及长波紫外线(320～400nm)光谱。
Abstract
Starch (ST),as a cheap and widely sourced natural polymer raw material,is a suitable substrate for preparing film materials due to its good film-forming and thermoplastic properties.However,starch film has defects such as strong hygroscopicity,hard and brittle texture.Introduction of appropriate components to modify starch film material can solve the above problems.In this paper,a starch/alkaline lignin halamine (ST/AL-MC) antibacterial composite film with excellent UV shielding and antibacterial properties was prepared using alkaline lignin (AL) as toughening material and 1-chloro-2,2,5,5-tetramethyl-4-imidazolinone (MC) as antibacterial agent by a simple solution casting method.The structure,microstructure and thermal stability of the antibacterial composite film were characterized by Fourier transform infrared spectroscopy,scanning electron microscopy and thermogravimetric analysis.Their mechanical properties,UV shielding performance and antibacterial performance were tested.The results showed that the ST/AL-MC antibacterial composite film exhibited excellent antibacterial effects,which could kill 80.65% of E.coli and 97.33% of S.aureus within 1minute of contact,and 99.99% of E.coli and S.aureus within 5 minutes of contact.In addition,the composite film containing 10wt% AL showed an elongation at break of 81.30% and toughness of 1.07MJ/m3,which were increased by 342% and 89% compared with the pure starch film,respectively,and the ductility and toughness were greatly improved.The antibacterial composite film could shield nearly 100% of medium wave ultraviolet (275～320nm),short wave ultraviolet (200～275nm),and long wave ultraviolet (320～400nm) spectra.
关键词
淀粉
/
碱性木质素
/
卤胺
/
抗菌
/
紫外屏蔽
Key words
starch
/
alkaline lignin
/
halamine
/
antibacterial
/
UV-shielding
淀粉/碱性木质素卤胺抗菌复合薄膜的制备及其性能研究[J].
化工新型材料, 2024, 52(7): 223-227 DOI:10.19817/j.cnki.issn1006-3536.2024.07.002
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基金资助
中国博士后科学基金资助项目(2020M681486)
