Fundamentals of double network hydrogels

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Double network (DN) hydrogels exhibit remarkable mechanical properties, including strength and toughness, attributed to their unique interpenetrating network structures.
• Since the inception of the first poly(acrylamide-co-N,N'-dimethylacrylamide)-poly(acrylamide) (PAMPS-PAAm) DN hydrogel 11 years ago, research in this field is still nascent.
• The availability of diverse monomers offers opportunities to design novel DN hydrogels and understand structure-property-toughening relationships.

Purpose of the Study:

• To provide a comprehensive overview of the development and fundamental principles of DN hydrogels.
• To highlight advancements in preparation methods, network structures, and toughening mechanisms.
• To identify potential design principles for future tough hydrogel development.

Main Methods:

• Literature review focusing on DN hydrogel research over the last decade.
• Analysis of preparation techniques for DN hydrogels.
• Examination of structure-property relationships and toughening mechanisms.

Main Results:

• DN hydrogels demonstrate exceptional mechanical strength and toughness due to their distinct network architectures and energy dissipation capabilities.
• Significant progress has been made in understanding the fundamental mechanisms underlying DN hydrogel performance.
• The review consolidates knowledge on preparation, structure, and toughening, offering insights for future material design.

Conclusions:

• DN hydrogels represent a promising class of soft-and-tough materials with vast potential for diverse applications.
• Continued exploration of monomer combinations and network designs is crucial for advancing DN hydrogel technology.
• This review serves as a foundational resource for researchers aiming to engineer next-generation tough hydrogels.