应用化学 ›› 2018, Vol. 35 ›› Issue (7): 767-775.DOI: 10.11944/j.issn.1000-0518.2018.07.170273

• 研究论文 • 上一篇    下一篇

氧化石墨烯对聚乙烯醇/硼酸水凝胶流变性能的影响

黄刚ab,张宏伟c,张欢欢ab,石彤非a,许东华a*()   

  1. a中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室 长春 130022
    b中国科学院大学 北京 100039
    c罗格斯大学食品科学系 美国 新泽西州 NJ08901
  • 收稿日期:2017-08-08 接受日期:2017-09-22 出版日期:2018-07-06 发布日期:2018-07-06
  • 通讯作者: 许东华
  • 基金资助:
    国家自然基金(21274152)项目资助

Influence of Graphene Oxide on the Rheological Properties of Poly(vinyl alcohol)/Borate Hydrogel

Gang HUANGab,Hongwei ZHANGc,Huanhuan ZHANGab,Tongfei SHIa,Donghua XUa*()   

  1. aState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    bGraduate School of the Chinese Academy of Sciences,Beijing 100039,China
    cDepartment of Food Science,Rutgers,The State University of New Jersey,65 Dudley Road,New Brunswick,NJ 08901,USA
  • Received:2017-08-08 Accepted:2017-09-22 Published:2018-07-06 Online:2018-07-06
  • Contact: Donghua XU
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21274152)

摘要:

研究了氧化石墨烯(GO)对聚乙烯醇(PVA)/硼酸(borate)水凝胶线性及非线性流变性能的影响。 通过扫描电子显微镜、硼谱核磁共振波谱以及流变研究了水凝胶的流变性能。 结果表明,GO质量浓度在稀溶液区时,GO片层与PVA链间通过硼酸根离子形成了具有弹性活性的缔合点,有效地提高了水凝胶的平台模量、松弛时间和零切粘度;当GO进一步增加到亚浓溶液区,部分的交联剂被GO的团聚体捕获并处于非弹性活性的缔合状态,处于有效缔合状态的交联剂变少,导致平台模量、松弛时间和零切粘度降低。 稳态剪切测试下,样品在剪切增稠区的粘度增加随着GO添加量的增加明显加强,这与剪切场下取向的氧化石墨烯片层参与网络结构的重排有关。

关键词: 聚乙烯醇/硼酸水凝胶, 氧化石墨烯, 剪切增稠, 流变

Abstract:

The influence of graphene oxide(GO) on the linear and nonlinear rheological properties of poly(vinyl alcohol)(PVA)/borate hydrogel was explored in this work. Results of scanning electron microscopy, 11B nuclear magnetic resonance and rheology reveal that elastically active points formed between dispersed GO sheets and PVA chains have enhanced plateau modulus(G0), relaxation time(τ) and zero shear viscosity(η0) of samples when the mass concentration of GO(ρ(GO)) is in the dilute concentration regime. As ρ(GO) is further increased to the semi-dilute concentration regime, part of cross-linkers is occupied by GO aggregation and exists as non-elastically active GO-borate-GO bond, then G0, τ and η0 of samples are decreased with ρ(GO). Under steady shear, the enhancement of viscosity in shear thickening regime always increases with ρ(GO) in different concentration regimes, which is related with the participation of oriented GO sheets to reorganization of the network.

Key words: poly(vinyl alcohol)/borate hydrogel, grapheme oxide, shear thickening, rheology