Creating tough and fatigue-resistant hydrogels with hierarchical structures
| Project/Area Number |
22K20521
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
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| Research Institution | Hokkaido University |
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Principal Investigator |
李 薛宇 北海道大学, 先端生命科学研究院, 助教 (80961565)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | rheological response / dynamic bonds / time-salt superposition / phase separation / mechanical property / Tough hydrogel / Fatigue resistance / multiscale structure / Energy dissipation |
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| Outline of Research at the Start |
We will prepare hydrogels with superior mechanical and physical properties by combining two components with strong modulus contrast: the soft and relative hydrophilic one favors forming small phase domains, whereas the hard and hydrophobic one favors forming large phase domains.
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| Outline of Annual Research Achievements |
To understand how the building blocks affect the hierarchical structure and performance of polyampholyte hydrogels, in the first year, we mainly focused on the role of dynamic bonds on the phase separation and dynamic mechanical behaviors.
Using salt to control the strength of ionic bonds, we found the phase separation size and phase contrast changed significantly with the salt concentrations. In addition, we demonstrate that the salt effect on mechanical properties, including small-strain moduli, large deformation energy dissipation, and fracture stretch ratio, can be effectively converted into frequency or strain rate dependences, following the time-salt superposition principle. The time-salt superposition principle of mechanical properties is not affected by the phase structure.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
In this fiscal year, we have successfully revealed the effect of ionic strengths on the phase separation and mechanical properties of polyampholyte hydrogels. Particularly, the time-salt superposition principle revealed in this fiscal year is critical for effectively controlling the mechanical properties in future studies. Based on these results, the progress is smooth.
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| Strategy for Future Research Activity |
The next study will investigate how the phase structure, and mechanical properties of polyampholyte hydrogels are affected by varied chemical components and dynamic behaviors. The correlation between the hierarchical structure and performances will be revealed.
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Report
(1 results)
Research Products
(6 results)
