The density and crystallinity properties of PPO-silica mixed-matrix membranes produced via the in situ sol-gel method for H2/CO2 separation. II: Effect of thermal annealing treatment

- Thermal annealing induces the polymer chain to re-crystallize.
- The particle size of the filler can affect the crystallization of MMMs.
- The crystallinity of the polymer matrix can affect the gas transport pathways.
- The H2/CO2 of PPO-S5 MMMs is improved after thermal annealing.
- The treated MMMs exhibit high membrane plasticization resistance.