Affiliation:
1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China
2. 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
Abstract
AbstractPolyurea (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 CO2‐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 CO2‐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.
Funder
National Natural Science Foundation of China
Collaborative Innovation Center of Suzhou Nano Science and Technology
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science