Sorption, diffusion, and perm-selectivity of toluene vapor/nitrogen mixtures through polydimethylsiloxane membranes with two cross-linker densities
Abstract(#br)The sorption, diffusion, and permeation properties of toluene and nitrogen from binary gaseous mixtures were studied using polydimethylsiloxane (PDMS) membranes with various cross-linker levels. The prepared PDMS membranes were characterized using X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and positron annihilation lifetime spectroscopy (PALS). The PDMS made with 10:1 pre-polymer/cross-linker ratio contained a negligible amount of unreacted cross-linker.