2026-05-22 名古屋工業大学,科学技術振興機構
図1. 本研究の概念図
＜関連情報＞
- https://www.nitech.ac.jp/news/press/2026/14003.html
- https://onlinelibrary.wiley.com/doi/10.1002/marc.70313
親水性で結合交換可能なドメインを持つビトリマー様材料における緩和特性の湿度依存性の解明 Unveiling Distinct Humidity Sensitivity of Relaxation Properties in Vitrimer-Like Materials with Hydrophilic, Bond Exchangeable Domains
Mikihiro Hayashi, Maho Suzuki, Shinji Suzuki, Koichi Mayumi, Yasuhito Suzuki, Shota Usukawa, Takumitsu Kida
Macromolecular Rapid Communications Published: 19 May 2026
DOI:https://doi.org/10.1002/marc.70313
ABSTRACT
Trans-N-alkylation reactions have frequently served as bond exchange mechanisms in vitrimer-like materials, enabling sustainable functionality governed by relaxation dynamics. As a unique class of these materials, we have studied nano-phase-separated systems containing nanodomains of quaternized pyridines that undergo trans-N-alkylation bond exchange. In these designs, the nanodomains arise from the hydrophilic character of quaternized pyridines. In this work, we reveal moisture sensitivity in our original systems, particularly with respect to their relaxation dynamics. Before the main results of relaxation properties, we experimentally assess the hydrophilic nature of quaternized domains by small-angle neutron scattering, using deuterated water. We then perform rheological measurements under controlled humidity, revealing a pronounced humidity effect on bond exchange-based relaxation. We likewise perform the same measurements for control bond exchangeable systems lacking hydrophilic components; humidity effects are evident on segmental relaxation but not decisively evident on bond exchange-based relaxation. This insight offers an eco-friendly route for temporally tuning the relaxation dynamics of bond exchangeable network materials containing specifically hydrophilic units.
