Table 8.

Summary of recent polymeric gas-separation (CO₂/CH₄) membrane improvement strategies for plasticization and aging resistance.

Strategies	Achievement/Advantages	Issues/Enhancement Needed/Proposed
Polymer Modifcation via Cross-linking	Manage to improve performance and plasticization and aging resistance	To reduce complexity and improve on mechanical strength
Polymer Blending	Improvement within the average of the selected polymer performance accompanied by reduction in one aspect.	To improve the blended polymer performance further via cross-linking
FTMs	Manage to improve performance for low-pressure applications	To improve for high-pressure applications, to resolve the water/solvent evaporation and hydrocarbon fouling issues
MMMs	Manage to improve polymeric membrane performance and mechanical strength within the inorganic properties	To improve on sealing, homogeneity and agglomeration
New Polymer	Successfully improve on permeability and plasticization resistance to a great extent	To improve on selectivity and aging