We introduce a volumetric analysis technique to characterize the solubility of hydrogen dissolved in polymers and its diffusion coefficient by electrical capacitance measurement electrodes to determine the water level in graduated cylinders. This new and simple technique measures the volume of hydrogen released from rubber inside a graduated cylinder after a sample is exposed to high-pressure hydrogen and subsequent decompression. A diffusion analysis program is utilized to determine the total uptake (C₀) and diffusivity (D) of hydrogen, which are used to calculate the solubility (S) and permeability (P). This method is applied to spherical rubber samples of nitrile butadiene rubber (NBR), ethylene propylene diene monomer (EPDM), and fluoroelastomer (FKM), which are potential sealing materials for H₂ energy infrastructures. C₀ follows Henry's law for all samples. No sample size and pressure dependence is observed for S, whereas an appreciable size dependence for the three rubbers is detected for D. The uncertainty is evaluated by considering uncertainty factors that affect the measurement. The correlation between D and density of rubber is found. The developed method can be utilized as a standard test for the transport properties versus pressure of various polymer membranes regardless of the sample shapes and size.

我们引入了一种体积分析技术，通过电容测量电极来确定溶解在聚合物中的氢的溶解度及其扩散系数，从而确定刻度量筒中的水位。这项新的简单技术可以测量样品在暴露于高压氢气和随后的减压后从量筒内橡胶释放的氢气量。利用扩散分析程序确定氢的总吸收率（C ₀）和扩散率（D），这些均用于计算溶解度（S）和渗透率（P）。该方法适用于丁腈橡胶（NBR），乙丙二烯单体（EPDM）和含氟弹性体（FKM）的球形橡胶样品，它们是H的潜在密封材料₂能源基础设施。对于所有样本，C _0均遵循亨利定律。没有观察到S的样品大小和压力相关性，而对于D则检测到三种橡胶的大小相关性。通过考虑影响测量的不确定性因素来评估不确定性。发现D与橡胶密度之间的相关性。所开发的方法可以用作各种聚合物膜相对于压力的传输特性与压力的标准测试，而与样品的形状和大小无关。