Recyclable VOCs-free eutectic adhesive based on hydrogen bond fusion strategy with robust adhesion, flame retardancy, transparency, high durability, and low-temperature resistance

Although emerging supramolecular adhesives have addressed the challenge of traditional adhesives in terms of de-bonding through non-covalent interactions, they still face issues such as high synthetic difficulty, elevated costs, and inadequate adhesion strength, particularly under low temperatures. Additionally, achieving robust adhesion to low-energy hydrophobic surfaces remains a persistent challenge. This paper proposes a novel hydrogen bond fusion strategy to address these challenges, presenting the synthesis of a new HCX eutectogel, containing intramolecular fused hydrogen bonds and intermolecular hydrogen bonds. This approach enables the attainment of high-strength adhesion on both hydrophilic (up to 10.61 MPa) and hydrophobic (up to 4.87 MPa) substrates. Notably, the HCX eutectogel stands out for its ability to maintain stable adhesion performance at low temperatures (-80 degrees C & liquid nitrogen) and its extraordinary flame retardancy and recyclability. These findings contribute novel insights into the development of high-performance adhesives with multifunctionality, promising advancements in diverse applications.