Structural characteristics and state of water in an acetate cellulose membrane

详细信息    查看全文

• 作者：S. I. Lazarev ; Yu. M. Golovin ; S. V. Kovalev
• 刊名：Theoretical Foundations of Chemical Engineering
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：50
• 期：3
• 页码：294-302
• 全文大小：547 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3431
• 卷排序：50

文摘

Experimental data have been obtained and an analysis has been performed of the degree of crystallinity and amorphism and the state of water for cellulose acetate membranes using the methods of X-ray diffraction (XRD), infrared spectroscopy and thermogravimetry. The degree of crystallinity, as well as the crystallite size, have been determined in the membrane samples before and after water absorption. It has been found that OH groups of cellulose acetate form a nonequilibrium network of hydrogen bonds between molecules and fragments in the amorphous phase of an air-dry semipermeable membrane. It has been shown that water that acts as a plasticizer causes the ordering of the macromolecular amorphous phase, which leads to a transition into the liquid crystal phase with the formation of additional capillary spaces.Keywordsmembranecrystallinityamorphismwater stateX-ray diffractioninfrared spectroscopythermogravimetry