Jung Jae Kap, Lee Ji Hun, Jang Jin Sub, Chung Nak Kwan, Park Chang Young, Baek Un Bong, Nahm Seung Hoon
Team of Hydrogen Energy Materials Research, Korea Research Institute of Standards and Science, Daejeon, 34113, Korea.
Department of Physics and Research Institute of Natural Science, Gyeongsang National University, Jinju, 52828, Korea.
Sci Rep. 2022 Feb 28;12(1):3328. doi: 10.1038/s41598-022-07321-1.
We demonstrate a simple experimental technology for characterizing the gas permeation properties of H, He, N and Ar absorbed in polymers. This is based on the volumetric measurement of released gas and an upgraded diffusion analysis program after high-pressure exposure. Three channel measurements of sorption content of gases emitted from polymers after decompression are simultaneously conducted, and then, the gas uptake/diffusivity as a function of exposed pressure are determined in nitrile butadiene rubber (NBR), ethylene propylene diene monomer (EPDM) rubbers, low-density polyethylene (LDPE) and high-density polyethylene (HDPE), which are used for gas sealing materials under high pressure. The pressure-dependent gas transport behaviors of the four gases are presented and compared. Gas sorption follows Henry's law up to 9 MPa, while pressure-dependent diffusion behavior is not observed below 6 MPa. The magnitude of the diffusivity of the four gases decreases in the order D > D > D > D in all polymers, closely related to the kinetic diameter of the gas molecules. The dependence of gas species on solubility is in contrast to that on diffusivity. The linear correlation between logarithmic solubility and critical temperature of the gas molecule was newly observed.
我们展示了一种简单的实验技术，用于表征聚合物中吸收的氢气、氦气、氮气和氩气的气体渗透特性。这基于对释放气体的体积测量以及高压暴露后的升级扩散分析程序。在减压后，同时对聚合物释放出的气体的吸附量进行三通道测量，然后在用于高压气体密封材料的丁腈橡胶（NBR）、三元乙丙橡胶（EPDM）、低密度聚乙烯（LDPE）和高密度聚乙烯（HDPE）中确定气体吸收/扩散率与暴露压力的函数关系。给出并比较了这四种气体的压力依赖性气体传输行为。在高达9兆帕的压力下，气体吸附遵循亨利定律，而在6兆帕以下未观察到压力依赖性扩散行为。在所有聚合物中，这四种气体的扩散率大小顺序为D＞D＞D＞D，这与气体分子的动力学直径密切相关。气体种类对溶解度的依赖性与对扩散率的依赖性相反。新观察到了气体分子的对数溶解度与临界温度之间的线性相关性。
