Shifting consumer preferences, along with the increasing focus on sustainable solutions and the growing burden of environmental regulations, will continue to transform polymer adhesives. Once a seemingly secondary component in matters of sustainability, adhesives are now under greater scrutiny for their environmental footprint from start to finish. Under such considerations, the durability of polymer adhesives must be critically reviewed. This chapter also examines novel developments in switchable adhesives, design-for-disassembly, and solventless systems, and evaluates their potential influence on the applicability of circular economy models. Although the general goal is to evaluate polymer adhesives within a cyclic construct, multiple innovative techniques and cutting-edge methodologies are presented. This chapter aims to provide a comprehensive review and critique of the sustainable transformation of polymer adhesives and their emerging role in contemporary environmentally friendly industries.