Dimensionally Stable and Mechanically Adaptive Polyelectrolyte Hydrogel.,Macromolecular Rapid Communications

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Dimensionally Stable and Mechanically Adaptive Polyelectrolyte Hydrogel.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-09-21 , DOI: 10.1002/marc.202000406
Chen Qian ₁ , Taka-Aki Asoh ₁ , Hiroshi Uyama ₁

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Mechanically adaptive hydrogels with reversible cross‐links can change their mechanical characteristics to adapt to the external environment. However, inevitable swelling/shrinkage occurs with the mechanical property change, which impedes the applications of these hydrogels. In this study, mechanical adaptivity with high dimensional stability is achieved in alginate‐based polyelectrolyte hydrogels by introducing an opposite swelling mechanism. The dually crosslinked alginate‐polystyrene sulfonate (Alg‐PSS) hydrogels are constructed through the copolymerization of alginate‐methacrylate (Alg‐MA) and sodium p‐styrene sulfonate (NaSS), as well as Ca²⁺ crosslinking. In the Alg‐PSS hydrogel network, the reversible Ca²⁺‐carboxylate and Ca²⁺‐sulfonate cross‐links can be disrupted by Na⁺ and soften the hydrogels. Moreover, the PSS chains crosslinked in the hydrogel network undergo the coil‐globule transition in concentrated NaCl solutions to suppress hydrogel swelling during softening. The optimized Alg‐PSS hydrogel (Alg₅‐PSS_0.75‐MBAA_2.5) shows a dramatic tensile modulus change from 191.3 kPa in deionized water (DIW) to 15.1 kPa in 2.0 mol L⁻¹ NaCl solution with a negligible volume increase ratio of only 0.6%. The Alg‐PSS hydrogels may find applications in artificial valves or soft robotics, where high dimensional stability and invariable volume are required for smart hydrogels.

中文翻译：

尺寸稳定且具有机械适应性的聚电解质水凝胶。

具有可逆交联的机械适应性水凝胶可以改变其机械特性以适应外部环境。然而，随着机械性能的改变不可避免地发生膨胀/收缩，这阻碍了这些水凝胶的应用。在这项研究中，通过引入相反的溶胀机理，在基于藻酸盐的聚电解质水凝胶中获得了具有高尺寸稳定性的机械适应性。双重交联的藻酸盐-聚苯乙烯磺酸盐（Alg-PSS）水凝胶是通过藻酸盐-甲基丙烯酸酯（Alg-MA）和对苯乙烯磺酸钠（NaSS）的共聚以及Ca ²⁺交联而构建的。在Alg-PSS水凝胶网络中，可逆的Ca 2 ⁺ -羧酸盐和Ca ²⁺磺酸盐的交联会被Na ⁺破坏并软化水凝胶。此外，在水凝胶网络中交联的PSS链在浓NaCl溶液中经历了盘状小球转变，从而抑制了软化过程中水凝胶的膨胀。优化的ALG-PSS的水凝胶（ALG ₅ -PSS _0.75 -MBAA _2.5）表示从（DIW）191.3千帕在去离子水中的显着的拉伸模量的变化，以15.1千帕在2.0摩尔大号^-1 NaCl溶液用的唯一的可忽略的量增加比率0.6％。Alg-PSS水凝胶可在人造阀门或软机器人中找到应用，其中智能水凝胶需要高尺寸稳定性和恒定体积。

更新日期：2020-11-19

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