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第 36 卷第 3 期 精 细 化 工 Vol.36, No.3
201 9 年 3 月 FINE CHEMICALS Mar. 2019
功能材料
壳聚糖/玉米醇溶蛋白膜液的流变与膜热性能
*
张利铭,刘战丽 ,王相友,孙 阳
(山东理工大学 农业工程与食品科学学院,山东 淄博 255049)
摘要:将壳聚糖与玉米醇溶蛋白按不同质量比共混得到了系列共混膜液(C/Z-0、C/Z-1、C/Z-3、C/Z-5)并通过
溶液浇铸制得相应共混膜。通过旋转流变仪、SEM 及 DSC 分析了不同质量比对共混膜液体系的流变特性、共
混膜的微观结构及共混膜热特性的影响。结果表明:不同质量比的共混膜液均具有假塑性,且随着玉米醇溶蛋
白质量分数的增加,膜液的稠度系数减小,流动指数增大(从 0.849 增加到 0.882),共混膜液的活化能均逐渐
升高。动态频率扫描流变学分析表明,储能模量和损耗模量均表现出对频率的依赖性,且随着玉米醇溶蛋白质
量分数的增加,两者数值均上升,此外,交叉点向低频方向移动,表明分子间氢键作用力增强。C/Z-1 共混膜中
壳聚糖与玉米醇溶蛋白分子结合紧密,相容性好,这也导致了共混膜热稳定性的提高。
关键词:壳聚糖;玉米醇溶蛋白;流变特性;微观结构;热特性
中图分类号:TB332 文献标识码:A 文章编号:1003-5214 (2019) 03-0374-07
Rheological Properties of Chitosan/Zein Blend Solutions and
Thermal Behaviour of Blend Films
*
ZHANG Li-ming, LIU Zhan-li , WANG Xiang-you, SUN Yang
(School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255049, Shandong, China)
Abstract: Chitosan was mixed with zein at different mass ratios to obtain a series of blend solutions (C/Z-0,
C/Z-1, C/Z-3, C/Z-5), and then corresponding blend films were prepared by solution casting. The effects of mass
ratios of chitosan to zein on the rheological properties of blend solution, the microstructure and thermal properties
of blend film were analyzed by rotational rheometer, SEM and DSC. The results showed that all these blend
solutions had pseudoplastic properties. With the increase of zein content, the consistency coefficient of
blend solution decreased, and the fluid index increased from 0.849 to 0.882. Furthermore, the activation
energy of blend solution increased gradually. The dynamic frequency scanning rheological analysis showed
that both storage modulus and loss modulus were dependent on frequency. With the increase of zein content,
both values increased, and the crossing point moved towards the low-frequency, indicating that the
intermolecular hydrogen bonding force was enhanced. In C/Z-1 blend film, chitosan and zein molecules
bound tightly and had good compatibility, which led to the improvement of thermal stability of blend film.
Key words: chitosan; zein; rheological properties; microstructure; thermal properties
Foundation items: National Natural Science Foundation of China (31301570, 30871757)
[2]
塑料包装难回收,难降解导致环境污染日益严 持良好品质以及延长保质期的作用 。
[1]
重 。解决塑料对环境污染的主要对策是用环境友 壳聚糖是由几丁质经过脱乙酰作用得到的聚合
好型材料替代塑料包装。可食用膜作为一种新型、 物,由于其具有多胺特性,因此对 pH 有很高的敏
无污染和可降解材料成为当前的研究热点,其良好 感性。壳聚糖易溶于稀酸,在溶液中结合 H ,可形
+
[3]
的阻隔性能和抑菌性能被广泛应用到食品包装领 成带正电荷的聚电解质 ,其作为一种可降解且有
[4]
域,以期达到在食品贮藏、运输和销售的过程中保 良好抑菌性材料被广泛地应用到膜材料中 。但壳
收稿日期:2018-11-05; 定用日期:2019-01-21; DOI: 10.13550/j.jxhg.20180807
基金项目:国家自然科学基金资助项目(31301570,30871757)
作者简介:张利铭(1994—),女,硕士生。联系人:刘战丽(1978—),女,副教授, 博士,E-mail:zhl_liu@163.com。