Abstract
The transport properties of gases in PPO (poly(2,6-dimethyl-1,4-phenylene oxide))-silica mixed matrix membranes (MMMs) were improved using a thermal annealing method. The density and crystallinity properties of the MMMs were characterized using TGA, XRD, FESEM, and FTIR to clarify the predominant mechanism of thermal annealing. The results indicate that the thermal-annealing treatment can induce the polymer chains to re-crystallize by annealing above Tg rather than causing them to exhibit solvent vaporization when MMMs were used. After thermal annealing, a significant enhancement in the gas separation, thermal stability, and plasticization resistance was observed for the PPO-silica MMMs. PPO-S5-220 (5wt.% silica) MMM produced the highest H2 permeability of 257.23Barrer and the highest H2/CO2 selectivity of 3.6.
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