Ou Xu, Pan Ji, Liu Qinbo, Niu Yajuan, Zhou Yingjie, Yan Feng
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Suzhou Key Laboratory of Soft Material and New Energy, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Adv Mater. 2024 Apr;36(16):e2312906. doi: 10.1002/adma.202312906. Epub 2024 Jan 15.
Polyurea (PUa) adhesives are renowned for their exceptional adhesion to diverse substrates even in harsh environments. However, the presence of quadruple bidentate intermolecular hydrogen bonds in the polymer chains creates a trade-off between cohesive energy and interfacial adhesive energy. To overcome this challenge, a series of CO-sourced ionic PUa adhesives with ultratough adhesion to various substrates are developed. The incorporated ionic segments within the adhesive serve to partially mitigate the intermolecular hydrogen bonding interactions while conferring unique electrostatic interactions, leading to both high cohesive energy and interfacial adhesive energy. The maximum adhesive strength of 10.9 MPa can be attained by ionizing the CO-sourced PUa using bromopropane and subsequently exchanging the anion with lithium bis(trifluoromethylsulfonyl)imide. Additionally, these ionic PUa adhesives demonstrate several desirable properties such as low-temperature stability (-80 °C), resistance to organic solvents and water, high flame retardancy, antibacterial activity, and UV-fluorescence, thereby expanding their potential applications. This study presents a general and effective approach for designing high-strength adhesives suitable for a wide array of uses.
聚脲（PUa）粘合剂以其即使在恶劣环境下也能对多种基材具有出色的粘附力而闻名。然而，聚合物链中四重双齿分子间氢键的存在导致内聚能和界面粘附能之间存在权衡。为了克服这一挑战，开发了一系列对各种基材具有超强力粘附力的源自CO的离子型PUa粘合剂。粘合剂中引入的离子链段有助于部分减轻分子间氢键相互作用，同时赋予独特的静电相互作用，从而产生高内聚能和界面粘附能。通过用溴丙烷使源自CO的PUa离子化，随后用双（三氟甲基磺酰）亚胺锂交换阴离子，可获得10.9 MPa的最大粘附强度。此外，这些离子型PUa粘合剂还表现出几种理想的性能，如低温稳定性（-80°C）、耐有机溶剂和水、高阻燃性、抗菌活性和紫外荧光，从而扩大了它们的潜在应用范围。这项研究提出了一种通用且有效的方法来设计适用于广泛用途的高强度粘合剂。
