The relationship between the water within polymer materials and their material properties is key to expanding their application scope. This study conducted quasi-elastic neutron scattering (QENS) measurements of fully carbon-deuterated epoxies to elucidate the molecular dynamics of water confined in the nanometer-scale voids (nanovoids) of epoxies, focusing on spatial information. The QENS measurements of epoxies with different stoichiometries revealed that the motion space of mobile water molecules in stoichiometric epoxy was more than twice the average size of nanovoids in the epoxy, indicating the broad distribution across multiple nanovoids. In contrast, the extents of oxirane-excess and amine-excess epoxies were close to the nanovoid size. The spatial dynamics of water and its relationship to the chemical structure will help in understanding the water diffusion mechanism and designing epoxy materials with excellent water-related properties, such as water resistance or transport.

中文翻译：

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准弹性中子散射限制在氘化环氧树脂中的水分子的空间动力学

高分子材料中的水与其材料性能之间的关系是扩大其应用范围的关键。本研究对全碳氘化环氧树脂进行了准弹性中子散射（QENS）测量，以阐明限制在环氧树脂纳米级空隙（纳米空隙）中的水的分子动力学，重点关注空间信息。对不同化学计量环氧树脂的 QENS 测量表明，化学计量环氧树脂中移动水分子的运动空间是环氧树脂中纳米空隙平均尺寸的两倍以上，表明多个纳米空隙的广泛分布。相反，环氧乙烷过量和胺过量的环氧树脂的程度接近纳米空隙尺寸。水的空间动力学及其与化学结构的关系将有助于理解水扩散机制并设计具有优异的与水相关的性能（例如耐水性或传输性）的环氧材料。