Jung Jaekap, Kim Gyunghyun, Gim Gahyoun, Park Changyoung, Lee Jihun
Hydrogen Energy Materials Research Center, 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.
Sensors (Basel). 2022 Feb 2;22(3):1141. doi: 10.3390/s22031141.
The objective of this work was to develop an effective technique for characterizing the permeation properties of various gases, including H, He, N, and Ar, that are absorbed in polymers. Simultaneous three-channel real-time techniques for measuring the sorption content and diffusivity of gases emitted from polymers are developed after exposure to high pressure and the subsequent decompression of the corresponding gas. These techniques are based on the volumetric measurement of released gas combined with the capacitance measurement of the water content by both semi-cylindrical and coaxial-cylindrical electrodes. This minimizes the uncertainty due to the varying temperature and pressure of laboratory environments. The gas uptake and diffusivity are determined as a function of the exposed pressure and gas spices in nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM) polymers. The pressure-dependent gas transport behaviors of four different gases are presented and compared with those obtained by different techniques. A linear correlation between the logarithmic diffusivity and kinetic diameter of molecules in the gas is found between the two polymers.
这项工作的目的是开发一种有效的技术，用于表征吸收在聚合物中的各种气体（包括H、He、N和Ar）的渗透特性。在聚合物暴露于高压并随后对相应气体进行减压后，开发了用于测量从聚合物中释放出的气体的吸附量和扩散率的同步三通道实时技术。这些技术基于对释放气体的体积测量以及通过半圆柱形和同轴圆柱形电极对含水量的电容测量。这将因实验室环境温度和压力变化而产生的不确定性降至最低。确定了气体吸收量和扩散率与丁腈橡胶（NBR）和三元乙丙橡胶（EPDM）聚合物中暴露压力和气体种类的函数关系。给出了四种不同气体的压力依赖性气体传输行为，并与通过不同技术获得的行为进行了比较。在两种聚合物中发现气体中分子的对数扩散率与动力学直径之间存在线性相关性。
