摘要
为了改善聚乙烯醇淀粉膜的抗菌性能,采用流延法制备了不同质量分数的柠檬酸改性聚乙烯醇淀粉复合膜,通过XRD、FTIR、SEM等方法分析测试了复合膜的微观组织结构及性能。结果表明,添加柠檬酸并未改变复合膜的晶型结构,当柠檬酸含量在4%以上时膜层晶态衍射峰的强度显著增强。改性后的复合膜具有更加均匀平整的表面状态,同时膜层的断面结构也更加致密规则。随着柠檬酸含量的增加,复合膜含水率和水蒸汽透过率减小;复合膜拉伸强度减小而断裂伸长率增加。柠檬酸改性对复合膜透光率的影响较小,但复合膜雾度增加。改性后的复合膜对大肠杆菌具有良好的抑菌性能。添加量为6%柠檬酸改性复合膜具有最佳的综合性能。
In order to improve the antibacterial properties of polyvinyl alcohol starch film,citric acid modified polyvinyl alcohol starch composite film with different mass fractions was prepared by tape casting method.The microstructure and properties of the composite film were analyzed by XRD,FTIR,SEM and other methods.The results show that adding citric acid did not change the crystal structure of the composite film,and the intensity of the crystalline diffraction peak of the film layer increased significantly when the content of citric acid was more than 4%.The modified composite film has a more uniform and flat surface state,and the section structure of the film layer is also more compact and regular.With the increase of citric acid content,the moisture content and water vapor transmittance of the composite film decrease.The tensile strength of the composite film decreases and the elongation at break increases.The citric acid modification has little effect on the transmittance of the composite film,but the haze of the composite film increased.The modified composite film has good bacteriostatic properties against e.coli.The addition amount of 6%citric acid modified composite film has the best comprehensive performance.
作者
石建伟
孙百会
李春伟
SHI Jianwei;SUN Baihui;LI Chunwei(College of Engineering and Technology,Northeast Forestry University,Harbin 150040,China)
出处
《包装与食品机械》
CAS
北大核心
2021年第1期18-24,共7页
Packaging and Food Machinery
基金
中央高校基本科研业务费专项资金资助项目(2572018BL09)
黑龙江省自然科学基金资助项目(LH2019E001)
中国国家留学基金资助项目(201906605017)
中国博士后科学基金资助项目(2016M590273)
东北林业大学大学生科研训练计划资助项目(KY202029)。
关键词
柠檬酸
聚乙烯醇
淀粉
复合膜
抑菌性
citric acid
polyvinyl alcohol
starch
composite film
bacteriostasis
作者简介
石建伟(1998),男,本科,研究方向为包装材料,E-mail:396377100@qq.com;通信作者:李春伟(1981),男,博士,副教授,研究方向为智能包装与功能薄膜,通信地址:150040黑龙江省哈尔滨市香坊区和兴路26号东北林业大学工程技术学院,E-mail:lcwnefu@126.com。
