Effect of processing conditions on microstructures and properties of hydroxypropyl methylcellulose/hydroxypropyl starch blends
Effect of processing conditions on microstructures and properties of hydroxypropyl methylcellulose/hydroxypropyl starch blends
复制标题
加工条件对羟丙基甲基纤维素/羟丙基淀粉共混物微观结构和性能的影响
DOI：
10.1016/j.foodhyd.2017.03.019
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发表时间：
2017-09
影响因子：
10.7
通讯作者：
Qian Jianya
中科院分区：
文献类型：
--
作者：
Zhang Liang;Yu Long;Liu Hongsheng;Wang Yanfei;Simon George P;Ji Zhili;Qian Jianya
羟丙基甲基纤维素（HPMC）是一种热凝胶，而羟丙基淀粉（HPS）是一种冷凝胶，它们的共混物表现出一些独特而有趣的相变和微观结构行为，这些行为控制了它们的性能。本工作主要研究了加工条件对不同比例HPMC/HPS共混物的微观结构和力学性能的影响，特别是孵育和干燥条件。为了更清楚地识别混染体系中淀粉相的变化，开发并应用了碘染色技术。采用流变仪、小角x射线散射仪（SAXS）、x射线衍射仪（XRD）、动态力学分析仪（DMA）和力学测试仪研究了混合凝胶和干燥膜在不同温度下的微观结构和相对性能的变化。结果表明，培养温度越高，共混凝胶的存储模量越高，类固性越好，自相似结构越致密。此外，经高温干燥的凝胶制备的薄膜具有更高的结晶度和更致密的非晶结构，从而提高了拉伸强度和模量，但降低了延伸率。
Since hydroxypropyl methylcellulose (HPMC) is a thermal gel while hydroxypropyl starch (HPS) is a cool gel, their blends show some unique and interesting behaviors of phase transitions and microstructures, which control their performances. This work focused on the effect of processing conditions on the microstructure and mechanical properties of these blends with various ratios of HPMC/HPS, in particular for incubation and drying conditions. To clearly identify the changes of starch phase in such blending system, the technique of dyeing HPS with iodine was developed and used. Rheometer, small angel X-ray scattering (SAXS), X-ray diffraction (XRD), dynamic mechanical analysis (DMA) and mechanical testing apparatus were used to study the changes of microstructure and the relative properties of the blending gels and dried films incubated at different temperatures. It was found that the higher incubation temperature resulted in higher storage modulus, more solid-like behavior and more compact self-similar structure of the blending gel. Moreover, the films prepared from the gels dried at high temperature showed higher crystalline degree and more compact amorphous structure, and therefore result in increasing tensile strength and modulus but decreasing elongation.
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DOI：
10.1016/j.msec.2013.11.043
发表时间：
2014-03
期刊：
Materials science & engineering. C, Materials for biological applications
影响因子：
--
作者：
Ricardo A Espinel Villacrés;S. Flores;L. Gerschenson
通讯作者：
Ricardo A Espinel Villacrés;S. Flores;L. Gerschenson
影响因子：
11.2
作者：
F. Ortega-Ojeda;H. Larsson;A. Eliasson
通讯作者：
F. Ortega-Ojeda;H. Larsson;A. Eliasson
影响因子：
1.9
作者：
刘操;胡春圃
通讯作者：
刘操;胡春圃
影响因子：
1.9
作者：
Zhang Liang;Wang Yanfei;L. Hongsheng;Zhang Nuozi;Li Xingxun;Chen Ling;Y. Long
通讯作者：
Zhang Liang;Wang Yanfei;L. Hongsheng;Zhang Nuozi;Li Xingxun;Chen Ling;Y. Long
DOI：
10.1088/0953-8984/6/2/003
发表时间：
1994-01
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
A. Vallêra;M. M. Cruz-M.;S. Ring;F. Boué
通讯作者：
A. Vallêra;M. M. Cruz-M.;S. Ring;F. Boué