PIM-1 mixed matrix membranes for gas separations using cost-effective hypercrosslinked nanoparticle fillers

Area of Science:

• Polymer Science
• Materials Science
• Chemical Engineering

Background:

• High-free-volume glassy polymers offer high permeability for membrane applications.
• Aging, or loss of free volume, limits the practical use of these polymers.
• Existing fillers to mitigate aging are often costly or unstable.

Purpose of the Study:

• To introduce a cost-effective and stable filler to enhance glassy polymer membranes.
• To investigate the impact of a novel hypercrosslinked polymer 'sponge' on membrane aging and performance.
• To improve CO2/N2 selectivity and overcome the Robeson upper bound.

Main Methods:

• Synthesis of a nanoparticulate hypercrosslinked polymer 'sponge'.
• Incorporation of the filler into high-free-volume glassy polymer matrices.
• Gas permeation and selectivity measurements over time to assess aging and performance.

Main Results:

• The novel filler is cheap, acid-tolerant, and enhances membrane permeability.
• Aging of the glassy polymer membranes was significantly retarded by the filler addition.
• CO2/N2 selectivity increased over time, surpassing the established Robeson upper bound.

Conclusions:

• A novel, inexpensive, and robust polymer filler effectively combats aging in glassy polymer membranes.
• The filler enhances both permeability and selectivity, offering a pathway to superior membrane performance.
• This approach presents a scalable solution for advanced membrane applications, exceeding current performance benchmarks.