Preparation and swelling properties of a starch-g-poly(acrylic acid)/organo-mordenite hydrogel composite

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• 作者：Yan Zhang ; Pingqiang Gao ; Lin Zhao…
• 关键词：hydrogel composite ; environmental ; responsiveness ; organo ; mordenite ; starch ; acrylic acid
• 刊名：Frontiers of Chemical Science and Engineering
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：10
• 期：1
• 页码：147-161
• 全文大小：1,147 KB
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• 作者单位：Yan Zhang (1) (3)
  Pingqiang Gao (3)
  Lin Zhao (1) (2)
  Yizhong Chen (2)
  
  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
  3. School of Chemistry and Chemical Engineering, Yulin University, Shaanxi, 719000, China
  2. School of Environment Science and Engineering, Tianjin University, Tianjin, 300072, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Industrial Chemistry and Chemical Engineering
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0187

文摘

A novel hydrogel composite was prepared via inverse suspension polymerization using starch, acrylic acid and organo-mordenite micropowder with the cross-linker, N,N′-methylenebisacrylamide and the initiator, potassium persulfate. Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, scanning electron microscopy, and energy dispersive spectroscopy confirmed that the acrylic acid was grafted onto the backbone of the corn starch, that the organo-mordenite participated in the polymerization, and that the addition of organo-mordenite improved the surface morphology of the hydrogel composite. The swelling capacity of the hydrogel composite was evaluated in distilled water, and solutions with different pH values, and various salt solutions. It was found that the incorporation of 10 wt-% organo-mordenite enhanced the water absorbency by 144% (from 268 to 655 g∙g–1) and swelling was extremely sensitive to the pH values, the concentration of the salt solution and cation type. Swelling kinetics and water diffusion mechanism of the hydrogel composite in distilled water were also discussed. Moreover, the hydrogel composite showed excellent reversibility of water absorption even after five repetitive cycles and the hydrogel composite exhibited significant environmental-responsiveness by changing the swelling medium from distilled water to 0.1 mol∙L–1 NaCl solution. In addition, the loading and release of urea by the hydrogel composite were tested and the nutrient-slowrelease capability of this material was found to be suitable for many potential applications.