通过原位相分离制备坚韧 PEG 凝胶用于 4D 打印,Advanced Functional Materials

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通过原位相分离制备坚韧 PEG 凝胶用于 4D 打印
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-04-08 , DOI: 10.1002/adfm.202300947
Zhenwu Wang ₁ , Matthias Heck ₂ , Wenwu Yang ₃ , Manfred Wilhelm ₂ , Pavel A. Levkin _{1,

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聚合物凝胶由溶剂溶胀的交联聚合物网络系统组成，由于其类似组织的机械性能，在生物医学、柔性电子产品和人造肌肉方面显示出巨大的潜力。由于大量溶剂的存在，聚合物凝胶力学性能的提高是一个挑战。此外，在一种聚合物凝胶系统中将高韧性与有用的特性（例如 3D 打印性或形状记忆）结合起来更具挑战性。在这项研究中，开发了一种简单有效的方法，通过在聚乙二醇（PEG）和聚丙二醇（PPG）的混合物中聚合甲基丙烯酸2-羟乙酯（HEMA）来制造坚韧的聚合物凝胶。聚合弹性网络与PEG（相容）和PPG（相容性较差）表现出明显的相容性，从而导致微尺度的原位相分离。所得相分离凝胶表现出高强度（8.0 MPa）、良好的断裂应变（430%）和大韧性（17.0 MJ m ^-3）。分离出的具有高玻璃化转变温度（75℃）的硬相赋予整个软聚合物凝胶在室温下具有形状记忆的特性。最后，可调谐坚韧 PEGgel 的制造与 3D 打印以及形状记忆特性相结合，展示了 PEGgel 在 4D 打印中的用途。

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Tough PEGgels by In Situ Phase Separation for 4D Printing

Polymer gels, consisting of cross-linked polymer network systems swollen by a solvent, show great potential in biomedicine, flexible electronics, and artificial muscles, due to their tissue-like mechanical properties. Due to the presence of a large amount of solvent, the improvement of the mechanical properties of the polymer gel is a challenge. Moreover, combining high toughness with useful properties, such as 3D printability or shape-memory, in one polymer gel system is even more challenging. In this study, a simple and efficient method is developed for the fabrication of tough polymer gels by polymerizing 2-hydroxyethyl methacrylate (HEMA) in a mixture of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG). The polymerized elastic networkpresents distinct compatibility with PEG (compatible) and PPG (poorly compatible), resulting in in-situ phase separation at the microscale. The resulting phase-separated gel demonstrates high strength (8.0 MPa), favorable fracture strain (430%), and large toughness (17.0 MJ m⁻³). The separated hard phasewith a high glass transition temperature (75 °C) endows the whole soft polymer gel with the property of shape memory at room temperature. Finally, the fabrication of tunable tough PEGgels is combined with 3D printing as well as with shape memory properties, demonstrating the use of PEGgels for 4D printing.

更新日期：2023-04-08

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