One‐Step Preparation of Tough and Self‐Healing Polyion Complex Hydrogels with Tunable Swelling Behaviors,Macromolecular Rapid Communications

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One‐Step Preparation of Tough and Self‐Healing Polyion Complex Hydrogels with Tunable Swelling Behaviors
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-11-22 , DOI: 10.1002/marc.201800691
Qian Du ₁ , Quan Tang ₁ , Kaixiang Yang ₁ , Haiyang Yang ₁ , Chao Xu ₁ , Xingyuan Zhang ₁

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Polyion complex (PIC) hydrogels formed by charge attraction of opposite charged polymers have received unique research interest. Their conventional preparation method, with a large amount of residual salt after polymerization, requires a long‐term dialysis treatment to remove the salt and toughen the gel. Here, a promising strategy for the one‐step preparation of tough PIC hydrogels without dialysis after polymerization is provided. Bicarbonate and proton ions are selected as the counter ions of the cationic monomer and anionic polymers, respectively. By a CO₂‐generating reaction between the counter ions, the residual salt is removed before polymerization, and thus, a PIC hydrogel with tough mechanical performance can be obtained instantly without dialysis. Due to the absence of dialysis, the tough hydrogel can be formed with a wide range of ratios for the oppositely charged polymer with distinct swelling behaviors from non‐swelling to super‐swelling. This tunable swelling behavior shows the possibility for shape‐morphing systems from this one‐step method.

中文翻译：

一步法制备具有可调节溶胀行为的坚韧且可自愈的聚离子复合水凝胶

通过带相反电荷的聚合物的电荷吸引形成的聚离子复合物（PIC）水凝胶受到了独特的研究兴趣。他们传统的制备方法是聚合后残留大量盐，因此需要长期透析处理以除去盐并使凝胶增韧。在此，提供了一种有前途的策略，用于一步一步制备坚韧的PIC水凝胶，聚合后无需进行透析。选择碳酸氢根离子和质子离子分别作为阳离子单体和阴离子聚合物的抗衡离子。通过CO ₂抗衡离子之间发生反应，在聚合之前除去残留的盐，因此无需透析即可立即获得具有坚韧机械性能的PIC水凝胶。由于没有透析，对于带相反电荷的聚合物，可以形成多种比例的坚韧水凝胶，具有从非溶胀到超溶胀的明显溶胀行为。这种可调节的溶胀行为表明采用这种单步方法可以形成形状变形的系统。

更新日期：2018-11-22

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