Semicrystalline physical hydrogels with shape-memory and self-healing properties
1Istanbul Technical University, Department of Chemistry, 34469 Maslak, Istanbul, Turkey. okayo@itu.edu.tr.
Journal of Materials Chemistry. B
|April 8, 2020
Summary
Semicrystalline hydrogels possess ordered crystalline domains, offering superior mechanical strength, stretchability, and unique functions like self-healing and shape-memory. These advanced materials show promise for innovative applications in 3D/4D printing and beyond.
Area of Science:
- Materials Science
- Polymer Chemistry
Background:
- Traditional synthetic hydrogels lack molecular order, unlike biological gels.
- Semicrystalline hydrogels, featuring crystalline domains, were first developed in 1994.
- These hydrogels exhibit enhanced mechanical properties and unique functionalities.
Purpose of the Study:
- To review recent advancements in semicrystalline physical hydrogels.
- To explore synthesis-molecular structure-property relationships.
- To discuss current challenges and future directions in the field.
Main Methods:
- Free-radical polymerization of vinyl monomers (hydrophilic and hydrophobic).
- Physical cross-linking to form crystalline domains within the hydrogel network.
- Characterization of material properties, including mechanical strength, stretchability, and thermal behavior.
Main Results:
- Semicrystalline hydrogels demonstrate exceptional mechanical strength and high stretchability.
- These hydrogels exhibit desirable properties such as melt-processability, self-healing, and shape-memory.
- A reversible solid-like to liquid-like transition occurs at the melting temperature.
Conclusions:
- Semicrystalline hydrogels represent a significant advancement over amorphous synthetic hydrogels.
- Their unique properties enable diverse applications, including smart inks for 3D/4D printing and injectable materials.
- Further research into synthesis-structure-property relationships will unlock their full potential.
