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Robust and adhesive double-solvent phase change hydrogel with reversible transparency and shape memory for thermal management and information encryption
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2023-08-09 , DOI: 10.1016/j.cej.2023.145329
Shengyang Qi , Weizhong Yuan

The excellent energy storage capacity of solid–liquid phase change materials has attracted considerable attention, but the vulnerability to leakage limits their applications. Therefore, the development of composite phase change materials has become a hot research topic in recent years. Therefore, a double-solvent (DS) phase change hydrogel (PCH) prepared by random copolymerization of acrylic acid (AA) and hydroxyethyl methacrylate (HEMA) with water and polyethylene glycol (PEG) as solvents was proposed. The phase transition enthalpies of melting and crystallization of the gel reached 116.2 J·g−1 and 113.5 J·g−1, respectively. PCH exhibits good morphological stability while storing thermal energy, which can effectively encapsulate phase change materials without leakage at high temperatures and be recyclable. PEG is used as both solvent and phase change part and the prepared gel reveals a high phase change material loading rate (76.2%), high breaking stress (4.7 MPa) and excellent compression resistance (1.2 MPa), superior to existing counterparts. The presence of a small amount of water in the system endows the gel with certain flexibility. Moreover, due to the solid–liquid phase transition behavior of PEG during temperature changes, PCHs possesses reversible adhesion and transparency, as well as shape memory properties. In addition, its low thermal conductivity and high energy storage efficiency make it perform well in the field of infrared stealth.



中文翻译:

坚固且具有粘性的双溶剂相变水凝胶,具有可逆透明度和形状记忆,用于热管理和信息加密

固液相变材料优异的储能能力引起了人们的广泛关注,但其易泄漏的问题限制了其应用。因此,复合相变材料的开发成为近年来的研究热点。因此,提出以丙烯酸(AA)和甲基丙烯酸羟乙酯(HEMA)无规共聚,以水和聚乙二醇(PEG)为溶剂制备双溶剂(DS)相变水凝胶(PCH)。凝胶熔融和结晶相变焓分别达到116.2 J·g -1和113.5 J·g -1, 分别。PCH在储存热能的同时表现出良好的形态稳定性,可以有效封装相变材料,在高温下不会泄漏,并且可回收利用。采用PEG作为溶剂和相变部分,制备的凝胶具有高相变材料负载率(76.2%)、高断裂应力(4.7 MPa)和优异的抗压缩性(1.2 MPa),优于现有同类产品。体系中少量水的存在赋予凝胶一定的柔韧性。此外,由于PEG在温度变化过程中的固液相变行为,PCHs具有可逆的粘附性和透明性以及形状记忆特性。此外,其低热导率和高储能效率使其在红外隐身领域表现出色。

更新日期:2023-08-12
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