Study on the mechanical properties of hydrogels enhanced by acryloyl-functionalized polyethyleneimine cross-links,Journal of Applied Polymer Science

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Study on the mechanical properties of hydrogels enhanced by acryloyl-functionalized polyethyleneimine cross-links
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-05-15 , DOI: 10.1002/app.55726
Hongming Lv ₁ , Haoran Cao ₁ , Min Xu ₁ , Junrui Miao ₁ , Xiaosai Hu ₁

Affiliation

Appropriate mechanical properties is one of the prerequisites for the applications of hydrogels, where cross-linker is a crucial component in manipulating such mechanical property. Herein, acryloyl-functionalized polyethyleneimine (APEI) was innovatively used as novel functional cross-links to optimize the mechanical properties of polyacrylamide (PAM) hydrogels. APEI cross-links were synthesized by simply adding acryloyl chloride into polyethyleneimine in aqueous solution. The chemical structures of APEI were confirmed by Fourier transform infrared and nuclear magnetic resonance spectra. APEI possessed massive highly acryloyl functional groups that can serve as multifunctional cross-linking centers for the polymerization of monomers via covalent bonding interactions. These covalent bonds are favorable for constructing a firm 3D cross-linked networks for hydrogels to withstand deformations, endowing hydrogels with the improved mechanical properties. The tensile strength with an elongation at break for the hydrogels can reach 234 kPa and 18.4-fold, respectively. In addition, even the hydrogels can bear cyclic mechanical loads and deformations for 50 cycles at 5-fold stain, indicating a good fatigue resistance. The deformability of APEI cross-links clusters under stretching was responsible for the stretchability of PAM/APEI hydrogels. This work provides a simple strategy to enhance the mechanical properties of hydrogels via the development of novel APEI chemical cross-linker.

中文翻译：

丙烯酰官能化聚乙烯亚胺交联增强水凝胶力学性能的研究

适当的机械性能是水凝胶应用的先决条件之一，其中交联剂是控制这种机械性能的关键组成部分。在此，丙烯酰官能化聚乙烯亚胺（APEI）被创新地用作新型功能交联，以优化聚丙烯酰胺（PAM）水凝胶的机械性能。通过简单地将丙烯酰氯添加到聚乙烯亚胺水溶液中来合成APEI交联。 APEI的化学结构经傅里叶变换红外光谱和核磁共振谱证实。 APEI 拥有大量的高丙烯酰基官能团，可以作为通过共价键相互作用进行单体聚合的多功能交联中心。这些共价键有利于构建坚固的3D交联网络，使水凝胶能够承受变形，从而赋予水凝胶改善的机械性能。水凝胶的拉伸强度和断裂伸长率分别可达234kPa和18.4倍。此外，水凝胶甚至可以在5倍染色下承受50次循环的机械载荷和变形，表明具有良好的抗疲劳性。 APEI 交联簇在拉伸下的变形性决定了 PAM/APEI 水凝胶的拉伸性。这项工作提供了一种通过开发新型 APEI 化学交联剂来增强水凝胶机械性能的简单策略。

更新日期：2024-05-15

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