Main > GASES > Gas Separation Membranes > Org.: UK. CU. (PIM: N2/O2; CH4/CO2) > Work Description

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"Polymer membranes are amorphous and possess a wide distribution of micropore sizes," observes Author. "Polymers with larger free volumes allow lots of molecules through but do not efficiently block the passage of larger molecules, whereas more tightly packed polymers are size-selective but flux is too small to be practical."

Authors; and coworkers have developed a series of porous polymer materials, with pore diameters of less than 2 nm, that combine high gas permeability and high selectivity for separating pairs of gases such as N2/O2 and CH4/CO2. They call the materials "polymers of intrinsic microporosity," or PIMs. "A PIM is special because its molecular structure is neither flexible enough for its backbone to change shape significantly nor regular enough for its molecules to pack together," Author says. "In the solid state, it traps a great deal of space and so behaves like a molecular sieve."

The PIMs are prepared by the dioxane-forming polymerization of hydroxylated aromatic monomers with fluorinated or chlorinated aromatic monomers



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