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Mechanical properties of PNIPAM based hydrogels: A review
Muhammad Abdul Haq1, Yunlan Su2, Dujin Wang2
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; Laboratory of Food Engineering, Department of Food Science & Technology, University of Karachi, Karachi, Pakistan.
Smart hydrogels, like poly(N-isopropylacrylamide) (PNIPAM), offer tunable properties. This review explores methods to enhance the mechanical strength of fragile PNIPAM hydrogels for practical applications.
Area of Science:
- Polymer Science
- Materials Science
- Biomaterials Engineering
Background:
- Smart materials dynamically alter properties in response to environmental stimuli like temperature and pH.
- Thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) hydrogels are crucial due to their tunable properties near body temperature.
- Native PNIPAM hydrogels exhibit poor mechanical strength, limiting their practical utility.
Purpose of the Study:
- To review strategies for improving the mechanical properties of PNIPAM hydrogels.
- To highlight advancements in creating robust and functional PNIPAM-based materials.
- To discuss the suitability of enhanced hydrogels for diverse applications.
Main Methods:
- Review of interpenetrating polymer network (IPN) hydrogels.
- Analysis of double network (DN) hydrogel strategies.
- Examination of nanocomposite (NC) and slide ring (SR) hydrogel approaches.
Main Results:
- Various methods significantly enhance the mechanical robustness of PNIPAM hydrogels.
- IPN, DN, NC, and SR strategies offer distinct advantages for mechanical reinforcement.
- Tuning mechanical properties is key to unlocking PNIPAM hydrogels' application potential.
Conclusions:
- Enhancing PNIPAM hydrogel mechanics is vital for their widespread adoption.
- Advanced network architectures and composite strategies provide effective solutions.
- Further research into these reinforced hydrogels will drive innovation in smart materials.
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