2022 Fiscal Year Research-status Report
Creating tough and fatigue-resistant hydrogels with hierarchical structures
| Project/Area Number |
22K20521
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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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| Keywords | rheological response / dynamic bonds / time-salt superposition / phase separation / mechanical property |
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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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| Causes of Carryover |
We will customize gel cutter with pure shear geometry, and buy a camera to track crack growth, some chemicals, glasses, glues, etc. In addtion, we will go to spring-8 and PF to measure SAXS or USAXS.
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