Abstract In this work, the electrical resistance method was used to get an insight of the liquid transport through the polymers with excess of fractional free volume. The dense films based on the first generation of polymers of intrinsic microporosity, disubstituted polyacetylenes PMP and PTMSP, were used; water-ethanol binary mixtures allowed to adjust the affinity of the liquid phase to selected polymers continuously. In this work, the liquid-membrane interaction was considered as a stepwise occupation of accessible free volume elements within the polymer, while the appearance of continuous (pseudo)liquid channels in the polymeric matrix, so-called percolation clusters, was required for formation of hydrodynamic liquid transport. Since the appearance of such percolation clusters might dramatically change the conductivity of hydrophobic materials, it was proposed to use the electrical resistance method to investigate the evaluation of selected polymers from being a barrier (water) to being permeable (ethanol) with respect to the liquid composition. To highlight the electrical resistance of the swollen films, all water/ethanol solutions contained NaCl (0.5 g/L). The steady-state values of liquid permeation, sorption/swelling, and electrical conductivity data were considered together and discussed. The electric resistance was significantly varied for 30 µm dense films of PMP (1–1300 kΩ) and PTMSP (0.15–910 kΩ) by the adjustment of ethanol content in water. The phase shift (25– 100,000 Hz) illustrated that the behavior of PTMSP and PMP membranes changed from mainly capacitive at low ethanol concentrations to the ion conductive as higher ethanol content. The very good quantitative agreement was found between the relative change of the membrane electrical resistance and the permeability as a function of the ethanol content in the liquid phase. Consequently, electrical resistance measurements could be used as an express method to determine the membrane permeability of low permeable materials, since the time required to get steady-state results was found to be much shorter for electrical resistance measurements than for permeability measurements.

中文翻译：

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通过电阻测量评估固有微孔疏水性聚合物的液体传输性能

摘要 在这项工作中，电阻法用于深入了解通过具有过量自由体积分数的聚合物的液体传输。使用基于第一代固有微孔聚合物、双取代聚乙炔 PMP 和 PTMSP 的致密薄膜；水-乙醇二元混合物允许连续调节液相对选定聚合物的亲和力。在这项工作中，液膜相互作用被认为是聚合物内可接近的自由体积元素的逐步占据，而聚合物基质中连续（伪）液体通道的出现，即所谓的渗流簇，是形成流体动力液体运输。由于这种渗流簇的出现可能会显着改变疏水材料的导电性，建议使用电阻法来研究所选聚合物的评估，从对液体组合物的屏障（水）到可渗透（乙醇）。为了突出溶胀薄膜的电阻，所有水/乙醇溶液都含有 NaCl (0.5 g/L)。液体渗透、吸附/溶胀和电导率数据的稳态值被一起考虑和讨论。通过调节水中的乙醇含量，PMP (1–1300 kΩ) 和 PTMSP (0.15–910 kΩ) 的 30 µm 致密薄膜的电阻显着变化。相移 (25–100,000 Hz) 说明 PTMSP 和 PMP 膜的行为从低乙醇浓度下的主要电容性转变为乙醇含量高时的离子导电性。在膜电阻的相对变化和作为液相中乙醇含量的函数的渗透性之间发现了非常好的定量一致性。因此，电阻测量可用作确定低渗透性材料的膜渗透性的快速方法，因为发现电阻测量获得稳态结果所需的时间比渗透性测量短得多。