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Unveiling Distinct Humidity Sensitivity of Relaxation Properties in Vitrimer-Like Materials with Hydrophilic, Bond
Mikihiro Hayashi1,2, Maho Suzuki1, Shinji Suzuki1
1Department of Life Science and Applied Chemistry, Graduated School of Engineering, Nagoya Institute of Technology, Nagoya, Japan.
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.
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