Page 50 - 精细化工2019年第12期

第 36 卷第 12 期 精 细 化 工 Vol.36, No.12
2019 年 12 月 FINE CHEMICALS Dec. 2019

功能材料
油酸对壳聚糖/玉米醇溶蛋白膜性能的影响

*
孙 阳，张利铭，刘战丽 ，王晓敏
（山东理工大学 农业工程与食品科学学院，山东 淄博 255049）

摘要：为了提高壳聚糖/玉米醇溶蛋白膜的机械性能，将壳聚糖液与玉米醇溶蛋白液共混，向其中加入含量为 0、
15%、30%、45%（以复合膜液中壳聚糖和玉米醇溶蛋白的总质量为基准，下同）的油酸进行改性，制得复合膜
液。考察了膜液的粒径、Zeta 电位、静态和动态流变特性；分析了油酸添加量对膜阻隔性能、机械性能和相容
性的影响。结果表明：添加油酸后，膜液体系粒径增大、分散均匀，添加 30%油酸的膜液分散性更好，PDI 为
0.34，粒径为 1307.5 nm。随着油酸含量增大，膜液黏度减小，流动指数增大，弹性模量和黏性模量增加。含 30%
油酸的膜机械性能较好，抗拉强度为 36.37 MPa，断裂伸长率为 22.32%。与不含油酸的膜相比，添加 45%油酸
膜的阻隔性增强，水蒸气、氧气透过率分别降低了 44.21%和 67.52%。复合膜中壳聚糖与玉米醇溶蛋白分子相容
性较好，表面光滑平整。
关键词：壳聚糖；玉米醇溶蛋白；油酸；Zeta 电位；流变特性；膜性能；功能材料
中图分类号：TB332 文献标识码：A 文章编号：1003-5214 (2019) 12-2378-07

Effect of Oleic Acid on the Properties of Chitosan/Zein Blend Film

*
SUN Yang, ZHANG Li-ming, LIU Zhan-li , WANG Xiao-min
（School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255049, Shandong, China）

Abstract: In order to improve the mechanical properties of chitosan/zein blend film, firstly, chitosan
solution and zein solution were blended, then, oleic acid as plasticizer was added into the above solution to
prepare a series of chitosan/zein film-forming solutions containing different mass fraction of oleic acid (0,
15%, 30%, 45%, based on the total mass of chitosan and zein solutions, the same below). The particle size,
Zeta potential, static and dynamic rheological properties of film-forming solutions were analyzed. The
effects of oleic acid on the barrier properties, mechanical properties and compatibility of blend films were
evaluated. The results showed that the addition of oleic acid made the particle size of film-forming solution
increase and disperse evenly. The film-forming solution containing 30% oleic acid exhibited better
dispersion property with a PDI of 0.34 and a particle size of 1307.5 nm. With the increase of oleic acid
content, the viscosity of film-forming solution decreased and the flow index increased, and the elastic
modulus and viscosity modulus increased. The blend film containing 30% oleic acid had better mechanical
properties, its tensile strength was 36.37 MPa and its elongation at break was 22.32%. Moreover, the barrier
property of this blend film was enhanced. The water vapor transmittance and oxygen transmittance of the
film-forming containing 45% oleic acid reduced by 44.21% and 67.52% compared with the film without
addition of oleic acid. In the blend film, chitosan and zein molecules demonstrated good compatibility, and
the surface of film was flat.
Key words: chitosan; zein; oleic acid; Zeta potential; rheology; film properties; functional materials

可食性膜作为一种新型、环境友好型材料，具 的研究热点。成膜液的流变特性会影响膜的厚度、
[2]
有良好的阻隔性、抑菌性和抗氧化等性能，可有效 均匀性和机械性能 ，研究成膜液的流变学可指导
[1]
解决塑料包装污染环境的问题 ，是食品包装领域 聚合，以制得性能优良的可食性膜。

收稿日期：2019-08-03; 定用日期：2019-10-12; DOI: 10.13550/j.jxhg.20190760
基金项目：国家自然科学基金（31301570; 30871757）
作者简介：孙 阳（1995—），男，硕士生。联系人：刘战丽（1978—），女，副教授，E-mail：zhl_liu@163.com。