ScholarWorks@경상국립대학교

초록

We firstly characterized the sorption and desorption properties of hydrogen gas dissolved in rubbery polymer by utilizing a newly developed volumetric analysis technique. This method was applied to spherical-shaped sealing rubber, such as ethylene propylene diene monomer. The total sorption uptake (C-infinity), total desorbed content (C-0), sorption diffusion coefficient (D-s) and desorption diffusion coefficient (D-d) of hydrogen in rubber are quantified as a function of diameter in both adsorption and desorption processes. No diameter dependence is observed for C-infinity and C-0, whereas D-s and D-d is diameter-dependent. The reversibility between C-infinity and C-0 observed in the process of adsorption and desorption implies the occurrence of physisorption rather than chemisorption by introducing hydrogen molecules. However, the difference between the D-s and D-d values may be ascribed to two different processes. Time to reach equilibrium in both sorption and desorption processes is found to be linearly proportional to the square of sample radius.

키워드