Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 43, Pages 29220-29226Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b10912
Keywords
tough hydrogels; polyacrylamide; casein; protein hydrogels; notch-insensitive hydrogels; energy dissipations
Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015R1A5A1037668, 2016R1C1B2007569]
- Ministry of Trade, Industry and Energy of Korea (MOTIE) [10052783]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052783] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1C1B2007569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Protein-based hydrogels have received attention for biomedical applications and tissue engineering because they are biocompatible and abundant. However, the poor mechanical properties of these hydrogels remain a hurdle for practical use. We have developed a highly stretchable and notch-insensitive hydrogel by integrating casein micelles into polyacrylamide (PAAm) networks. In the casein PAAm hybrid gels, casein micelles and polyacrylamide chains synergistically enhance the mechanical properties. Casein-PAAm hybrid gels are highly stretchable, stretching to more than 35 times their initial length under uniaxial tension. The hybrid gels are notch-insensitive and tough with a fracture energy of approximately 3000 J/m(2). A new mechanism of energy dissipation that includes friction between casein micelles and plastic deformation of casein micelles was suggested.
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