Gas Transport Properties of Tetramethyl Polysulfones Containing Trimethylsilyl Group Side Substituents

摘要

Polysulfones with rigid chain structures and trimethylsilyl (TMS) substituents were prepared as potential membrane materials having enhanced gas transport properties. Tetramethyl polysulfones were modified by bromination and lithiation methodology to introduce high levels of TMS groups. Direct lithiation resulted exclusively in ortho-sulfone TMS. Bromination followed by excess lithiation resulted in a high degree of substitution (DS) of TMS on both the bisphenol and phenylsulfone rings. Polymers with a high DS of TMS had high CO_2 and O_2 permeabilities and good permselectivities from N_2. Permeabilities were correlated with d-spacing and specific volume.