Dynamic Hydrophobic Domains Enable the Fabrication of Mechanically Robust and Highly Elastic Poly(vinyl alcohol)-Based Hydrogels with Excellent Self-Healing Ability,ACS Materials Letters

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Dynamic Hydrophobic Domains Enable the Fabrication of Mechanically Robust and Highly Elastic Poly(vinyl alcohol)-Based Hydrogels with Excellent Self-Healing Ability
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-06-05 , DOI: 10.1021/acsmaterialslett.0c00075
Xu Fang ₁ , Yixuan Li ₁ , Xiang Li ₁ , Wenmo Liu ₂ , Xianghui Yu ₂ , Fei Yan ₃ , Junqi Sun ₁

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It is a great challenge to fabricate self-healing hydrogels that simultaneously possess high mechanical strength and good elasticity, and are capable of rapidly and efficiently healing physical damage. In this work, such hydrogels are fabricated by grafting 4-carboxybenzaldehyde (CBA) onto poly(vinyl alcohol) (PVA) in dimethyl sulfoxide, followed by sequential dialysis in ethanol and water. The dialysis in ethanol generates hydrogen-bond-cross-linked PVA-CBA organogels with homogeneous structures while the subsequent dialysis in water leads to PVA-CBA hydrogels uniformly dispersed with hydrogen-bond-cross-linked hydrophobic domains. The in-situ-formed hydrophobic domains with an average diameter of ∼13 nm can strengthen the PVA-CBA hydrogels to a tensile strength of ∼5.8 MPa and toughness of ∼14.9 MJ m^–3, and endow the hydrogels with good elasticity. Because of the presence of hydrogen bonds, the hydrophobic domains can reversibly break and reform to enable the rapid and efficient self-healing of fractured hydrogels at room temperature to restore their original mechanical strength. Meanwhile, the hydrogels have good biocompatibility and are potentially useful as post-operative antiadhesive films.

中文翻译：

动态的疏水域使具有强大的自修复能力的机械坚固和高弹性的聚乙烯醇基水凝胶的制备成为可能

制造同时具有高机械强度和良好的弹性并能够快速有效地修复物理损伤的自修复水凝胶是一个巨大的挑战。在这项工作中，通过将4-羧基苯甲醛（CBA）接枝到二甲基亚砜中的聚乙烯醇（PVA）上，然后在乙醇和水中依次渗析来制造这种水凝胶。在乙醇中透析产生具有均一结构的氢键交联的PVA-CBA有机凝胶，而随后在水中的透析导致PVA-CBA水凝胶均匀地分散有氢键交联的疏水域。平均直径约为13 nm的原位形成的疏水域可以使PVA-CBA水凝胶增强至约5.8 MPa的拉伸强度和约14.9 MJ m ^–3的韧性。，赋予水凝胶良好的弹性。由于氢键的存在，疏水域可以可逆地断裂和重整，以使断裂的水凝胶能够在室温下快速有效地自我修复，以恢复其原始的机械强度。同时，水凝胶具有良好的生物相容性，并且潜在地可用作术后抗粘膜。

更新日期：2020-07-06

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