Abstract
A polyimide membrane, 6FDA–TMPD, was prepared from 5,5′-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis-1,3-isobenzofurandione (6FDA), and 2,4,6-trimethyl-1,3-phenylenediamine (TMPD). The effect of ultraviolet irradiation (UV irradiation) using a high-pressure mercury lamp on the gas transport properties of the 6FDA–TMPD membrane and membranes containing a photosensitizer was explored. Comparison between UV treatment and thermal treatment was also examined. The gas selectivities in all membranes were increased due to the irradiation. Especially in the H 2/N 2 and H 2/CH 4 separations, the selectivities effectively increased without a significant reduction in the H 2 permeability. These increases were considerable in the membrane having no photosensitizer which was expected to be an initiator for the cross-linking reaction. There was little effect of cross-linking, which was formed by the irradiation, on the gas permeation properties. Photosensitizers prevented drastic change in the membrane morphologies due to the irradiation.
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