Change of Morphological Properties in Drawing Water- Swollen Cellulose Films Prepared from Organic Solutions. A View of Molecular Orientation in the Drawing Process
Change of Morphological Properties in Drawing Water- Swollen Cellulose Films Prepared from Organic Solutions. A View of Molecular Orientation in the Drawing Process
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DOI：
10.1002/(sici)1099-0488(19990301)37:5
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发表时间：
1999-03
期刊：
影响因子：
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通讯作者：
E. Togawa;T. Kondo
中科院分区：
文献类型：
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作者：
E. Togawa;T. Kondo
通过将两种不同的纤维素有机溶液体系在水中混合，制备了可拉伸的水溶胀纤维素膜。水溶胀膜的拉伸性取决于凝固速率.通过缓慢凝固制备的透明膜显示出良好的拉伸性能，并且具有2.0的最大拉伸比。然而，即使在50°C真空干燥后，拉伸膜仍保持高度非结晶状态。X-射线分析和偏振FT-IR测量下进行的饱和氧化氘蒸气的这些干燥的拉伸膜，通过缓慢凝固制备，表明它们的非结晶区域（超过80%）以及结晶区域（小于20%）是高度取向的拉伸过程。此外，在X-射线衍射的衍射强度曲线表现出有趣的图案，即使所绘制的样品是高度非结晶。事实上，它们与再生纤维素II纤维中的那些完全不同。然而，尽管拉伸比和链的取向增加，但膜中结晶域的数量没有显著增加。这可能归因于由链之间的分子间氢键产生的三维网络结构，所述氢键通过拉伸过程保持并且可以阻碍纤维素的结晶。© 1999 John Wiley & Sons，Inc.聚合物科学杂志B：聚合物物理37：451- 459，1999
Drawable water-swollen cellulose films were prepared by coagulating in water two different cellulose organic solution systems. The drawability of the water- swollen films was dependent on the rate of coagulation. Transparent films prepared by the slow coagulation showed good drawability and had a maximum draw ratio of 2.0. However, the drawn films maintained the highly noncrystalline state even after dried at 50°C under vacuum. X-ray analysis and polarized FT-IR measurements performed under a saturated deuterium oxide vapor of these dried drawn films, prepared by slow coagulation, showed that their noncrystalline regions (more than 80%) as well as crystalline regions (less than 20%) were highly oriented by the drawing process. Furthermore, meridional intensity curves in the X-ray diffraction exhibited interesting patterns even though the drawn sample was highly noncrystalline. In fact, they are quite different from those in regenerated cellulose II fibers. However, despite this increase in draw ratio and in the orientation of the chains, the number of crystalline domains in the films did not increase significantly. This may perhaps be attributed to the three-dimensional network structure resulting from the intermolecular hydrogen bonds between chains which are maintained through the drawing process and which can hinder the crystallization of cellulose. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 451- 459, 1999