Adhesives are nonmetallic polymer materials which possess the ability to join together two independent surfaces by chemical and physical bonding. The Chung group studies functional adhesives that exceeds conventional role of adhesive. For instance, the newly developed adhesives include 1) single-phase photo-crosslinkable adhesives which enhances adhesion strength by UV irradiation, 2) photo-degradable adhesive that reduce adhesion strength by UV irradiation, 3) Zwitterionic polymer-based adhesives that can be used in biomedical applications, 4) glucose-based adhesives which can form strong adhesion via copper free click reaction, 5) post-polymerization modification (oxime ligation functionalization) enabled bottle-brush type adhesives, and 6) silicone nano cage-reinforced pressure sensitive adhesives. In Chung’s group research, the most important development tool of new adhesives is organic synthesis of monomer and polymer. In addition to the synthesis of adhesive polymers, the Chung group also determines precise structure-property relationships of the new adhesives based upon accurate physical and chemical property characterizations of polymers. Most of developed adhesives is designed to be used for biomedical applications such as tissue adhesive, intestine sealing agents, and hemostasis, because all adhesives are water-based and biologically compatible. Overall, the series of new adhesives development demonstrates how new chemical functionalities can strongly affect polymer properties which govern adhesion.