Abstract

The swelling of a Nafion polymer membrane in water poured into a cell with a characteristic size close to the membrane thickness has been studied experimentally using Fourier IR spectroscopy. The interest in these studies is due to the fact that the Nafion swelling in a cell whose size greatly exceeds the membrane thickness is accompanied by intense unwinding of polymer fibers into the water bulk. However, this process had not been studied in the case where the region that can be occupied by unwound polymer fibers is limited by the cell size. It is shown that the temporal dynamics of the polymer transition from hydrophobic to hydrophilic state has some peculiar features in this case, which are determined by the cell size, isotopic composition, and preliminary treatment (intense shaking) of the liquid in which a Nafion sample swells.

中文翻译：

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液体样品振动在聚合物膜膨胀动力学中的作用：有限体积的细胞

摘要

Nafion 聚合物膜在倒入特征尺寸接近膜厚度的电池中的水中溶胀已使用傅立叶红外光谱进行了实验研究。在这些研究中的兴趣是由于这样一个事实，即尺寸大大超过膜厚度的细胞中的 Nafion 膨胀伴随着聚合物纤维强烈退绕到水体中。然而，在可被展开的聚合物纤维占据的区域受泡孔尺寸限制的情况下，尚未研究该过程。结果表明，在这种情况下，聚合物从疏水状态转变为亲水状态的时间动力学具有一些特殊的特征，这些特征由细胞大小、同位素组成和 Nafion 样品所在液体的预处理（剧烈摇动）决定。膨胀。