Abstract
A hydrogel is a three-dimensional structure consisting of biological resources that are slightly cross-linked with top swelling capacity in an aqueous solution to very high swelling capacity. The superior physical and chemical characteristics of hydrogels such as flexibility, swelling, smoothness, and biocompatibility have led to research attention in hydrogel synthesis. The further development of these properties is growing, leading to increased use in various fields. Smart hydrogels play important roles in a variety of applications such as drug delivery systems, tissue engineering, optics, diagnostics, and imaging. The purpose of this chapter is to provide an overview of the basic concepts of hydrogels as well as a description of their classification, regeneration, reusability, hydrogel recovery, and applications for circularity. Finally, this chapter concludes with a life cycle assessment of sustainable hydrogels from different perspectives with different future trends.
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