| 研究実績の概要 |
At present, the development of underwater adhesive gels is mostly based on random copolymerization/blending of bioinspired functional groups, lacking the understanding of the synergistic effect and the sequential effect of functional groups on adhesion. This severely restricts the accurate understanding of the underwater adhesion mechanism and the directional design of material properties.
In response to the above challenges, in this fiscal year, we established a facile method to synthesize hydrogels from the same pair of monomers but the different average sequences and to study the effect of the monomer sequence on the properties of bulk hydrogels. First, we discovered that solvent show strong influence on cationic/aromatic monomer copolymerization kinetics. In dimethyl sulfoxide (DMSO), polymer with adjacent-rich sequence can be synthesized, while, in dimethyl sulfate (DMS), polymers have a one-component-rich sequence. Based on this, we fabricated hydrogels in DMSO and DMS solvents and studied the effect of monomer sequences on their network structures as well as various properties, including swelling degrees, rheological properties, mechanical strength, and adhesiveness in water and saline solutions. This work provides a new approach for controlling the polymer sequence in hydrogels by tuning the reactivity ratios of the monomers. Moreover, this work indicates that the monomer sequence has a strong impact on the network structures and properties of related hydrogels, which has rarely been discussed in earlier studies.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In this fiscal year, we have successfully fabricated hydrogels with the same composition but different sequences, and systematically studied and revealed the relationship between monomer sequence and material properties. The related works have been published in three papers. The research is progressing more smoothly than initially planned.
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| 今後の研究の推進方策 |
The current results clearly showed that the monomer sequence has a strong effect on material properties. In the next research, we would like to fabricate more underwater adhesive materials with different components, sequences, and mesostructures; study the material properties; reveal the relationship between these structures and properties.
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| 次年度使用額が生じた理由 |
There are two reasons why the usage amount for the next fiscal year was generated. First, due to the influence of the coronavirus, the planned travel expenses could not be executed. Second,the most chemical reagents used in the current experiment were purchased before the fund was obtained.
For the above reasons, the initial estimated amount and the execution amount are different, but there is no change in the research plan. We will proceed with the research as planned, such as by allocating it to the article processing charge.
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