高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (7): 1422.doi: 10.7503/cjcu20150174

• 高分子化学 • 上一篇    下一篇

温敏性纤维素/聚N-异丙基丙烯酰胺复合水凝胶的固体核磁共振表征及动力学研究

王敏, 葛昊, 宋建会, 徐敏()   

  1. 华东师范大学物理系, 上海市磁共振重点实验室, 上海 200062
  • 收稿日期:2015-03-03 出版日期:2015-07-10 发布日期:2015-06-05
  • 作者简介:联系人简介: 徐 敏, 女, 博士, 教授, 博士生导师, 主要从事高分子材料研究. E-mail:xumin@phy.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 51273067)资助

Solid-state NMR Study on the Dynamics of Thermo-sensitive Cellulose/Poly(N-isopropylacrylamide) Composite Hydrogel

WANG Min, GE Hao, SONG Jianhui, XU Min*()   

  1. Department of Physics, Shanghai Key Laboratory of Magnetic Resonance,East China Normal University, Shanghai 200062, China
  • Received:2015-03-03 Online:2015-07-10 Published:2015-06-05
  • Contact: XU Min E-mail:xumin@phy.ecnu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.51273067)

摘要:

利用半互穿网络方法将具有温度响应的高分子聚N-异丙基丙烯酰胺(PNIPAM)与天然纤维素复合得到温敏性水凝胶. 通过固体核磁共振的 1H, 13C CP/MAS(交叉极化/魔角旋转)和QCP(定量交叉极化)等实验手段对复合凝胶的结构进行了定性及定量研究, 并利用固体静态变温核磁共振实验和偶极滤波-自旋扩散实验研究了复合凝胶中PNIPAM分子链段的动力学行为.

关键词: 固体核磁共振, 温敏性水凝胶, 纤维素, N-异丙基丙烯酰胺, 分子动力学

Abstract:

The cellulose/poly(N-isopropylacrylamide)(PNIPAM) composite thermo-sensitive hydrogel was prepared by interpenetrating polymer network(IPN) approach. Various solid-state nuclear magnetic resonance(NMR) methods including 13C cross polarization/magic angle spinning nuclear magnetic resonance(CP/MAS NMR), 13C quantitative cross polarization(QCP) NMR, static 1H NMR and 1H filtering-spin diffusion NMR experiments were performed to analyze the structure, content, property and dynamics of the composite thermo-sensitive hydrogel. The results show that the cellulose/PNIPAM composite hydrogels have obvious temperature sensitivity. Cellulose molecules are relatively rigid while PNIPAM molecules are flexible. The space between cellulose and PNIPAM chains are very close.

Key words: Solid-state NMR, Thermo-sensitive hydrogel, Cellulose, Poly(N-isopropylacrylamide), Molecular dynamics

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