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Pressure-Responsive Polymer Membranes of Slide-Ring Gels with Movable Cross-Links

机译：具有可移动交联的滑环凝胶的压力响应性聚合物膜

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摘要

Slide-ring (SR) gels, which have movable cross-links, have received much attention as a novel class of polymer gels. The network topology of SR gels is variable as it responds to an imposed stress or deformation whereas that of classical gels, which have fixed cross-links, is invariable. The network chains in SR gels are topologically interlocked by figure-eight cross-links (slide-rings) (Figure la). Polyrotaxane (PR)-based SR gels were first synthesized by the intermolecular cross-linking of α-cyclodextrin (α-CD) in poly(ethylene glycol) (PEG). It has been demonstrated that the movable cross-links of PR gels result in unusual mechanical properties, such as a finite strain-dependent equilibrium Poisson's ratio, minimal strain coupling upon unequal biaxial stretching, the presence of a large degree of viscoelastic relaxation in the elastomeric regime, and no appreciable emergence of structural inhomogenei-ties under uniaxial stretching. We focus here on the fluid-permeation behavior of SR-gel membranes under an imposed pressure (p) (Figure 1b). The p-driven fluid permeation is a classical issue in the physics of polymer gels, and the details of this phenomenon have been elucidated for gels with fixed cross-links.
机译：具有可移动交联的滑环（SR）凝胶作为一类新型的聚合物凝胶受到了广泛的关注。 SR凝胶的网络拓扑结构是可变的，因为它可以对施加的应力或变形做出响应，而具有固定交联的经典凝胶的网络拓扑结构则是不变的。 SR凝胶中的网络链在拓扑上由图8交联（滑环）互锁（图1a）。首先通过α-环糊精（α-CD）在聚乙二醇（PEG）中的分子间交联合成基于聚轮烷（PR）的SR凝胶。已经证明，PR凝胶的可移动交联会导致异常的机械性能，例如有限的应变依赖性平衡泊松比，不等双轴拉伸时的最小应变耦合，弹性体中存在很大程度的粘弹性松弛的结构，并且在单轴拉伸下没有明显的结构不均匀性出现。在这里，我们将重点放在施加压力（p）的SR凝胶膜的流体渗透行为上（图1b）。 p驱动的流体渗透是聚合物凝胶物理学中的经典问题，对于具有固定交联的凝胶，已经阐明了这种现象的细节。

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  • 来源
    《Advanced Materials》 |2013年第33期|4636-4640|共5页
  • 作者

    Chikara Katsuno; Akihiro Konda; Kenji Urayama; Toshikazu Takigawa; Masatoshi Kidowaki; Kohzo Ito;

  • 作者单位

    Department of Materials Chemistry Kyoto University Kyoto 615-8510, Japan;

    Department of Materials Chemistry Kyoto University Kyoto 615-8510, Japan;

    Department of Materials Chemistry Kyoto University Kyoto 615-8510, Japan,Department of Macromolecular Science and Engineering, Kyoto Institute of Technology, Kyoto 606-8585, Japan;

    Department of Materials Chemistry Kyoto University Kyoto 615-8510, Japan;

    Department of Applied Chemistry Shibaura Institute of Technology Tokyo 135-8548, Japan;

    Graduate School of Frontier Sciences The University of Tokyo Kashiwa 277-8561, Japan;

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