A Highly Conductive, Self-Recoverable, and Strong Eutectogel of a Deep Eutectic Solvent with Polymer Crystalline Domain Regulation,ACS Applied Materials & Interfaces

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A Highly Conductive, Self-Recoverable, and Strong Eutectogel of a Deep Eutectic Solvent with Polymer Crystalline Domain Regulation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-07 , DOI: 10.1021/acsami.1c17442
Yan Wang ₁ , Jiake Wang ₁ , Zhongzheng Ma ₁ , Lifeng Yan ₁

Affiliation

It is desirable to fabricate an antifatigue gel for skin-mimicking sensors on the demand of long-term durability in practical usage. Here, we developed a physically cross-linked eutectogel based on a poly(vinyl alcohol)/poly(acrylic acid) (PVA/PAA) binary polymer skeleton and a deep eutectic solvent (DES). In this eutectogel, uniformly distributed PVA crystalline domains acted as stable physical cross-linkers, and high-density hydrogen bonds possessed great reversibility. Such a polymer network structure was expected to endow this eutectogel with excellent mechanical strength, stretchability, and a self-recovery ability. Specifically, this eutectogel exhibited a superior tensile strength of 2.6 MPa, a fracture strain of 680%, and a fracture toughness of 8.39 MJ m^–3. In cyclic stretching/releasing tests with a fixed strain of 100%, this eutectogel could recover its mechanical properties within a 600 s resting time. Based on this self-recoverable eutectogel, a reliable flexible sensor was fabricated, which possessed good sensitivity and stability over a wide strain range (1–300%). More importantly, the flexile sensor was able to maintain a highly repeatable response signal during 1000 consecutive stretching/releasing cycles, showing outstanding long-term durability. Given the excellent sensing performance, this eutectogel has promising potential in wearable electronics, human–machine systems, and soft robotics.

中文翻译：

一种具有聚合物晶畴调节的高导电、可自我恢复和强共晶溶剂的共晶凝胶

在实际使用中，出于长期耐久性的要求，需要制备用于模拟皮肤的传感器的抗疲劳凝胶。在这里，我们开发了一种基于聚（乙烯醇）/聚（丙烯酸）（PVA/PAA）二元聚合物骨架和深共熔溶剂（DES）的物理交联共晶凝胶。在这种共晶凝胶中，均匀分布的 PVA 晶畴充当稳定的物理交联剂，并且高密度氢键具有很大的可逆性。这种聚合物网络结构有望赋予这种共晶凝胶优异的机械强度、拉伸性和自恢复能力。具体而言，该共晶凝胶具有 2.6 MPa 的优异拉伸强度、680% 的断裂应变和 8.39 MJ m ^–3的断裂韧性. 在固定应变为 100% 的循环拉伸/释放测试中，该共晶凝胶可以在 600 秒的静止时间内恢复其机械性能。基于这种自恢复共晶凝胶，制造了一种可靠的柔性传感器，该传感器在很宽的应变范围（1-300%）内具有良好的灵敏度和稳定性。更重要的是，柔性传感器能够在 1000 次连续拉伸/释放循环期间保持高度可重复的响应信号，显示出出色的长期耐用性。鉴于优异的传感性能，这种共晶凝胶在可穿戴电子产品、人机系统和软机器人领域具有广阔的应用前景。

更新日期：2021-11-17

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