| 摘要 |
TITLE POLYIMIDE GAS SEPARATION MEMBRANES Aromatic polyimide gas separation membranes containing the repeating unit: <IMG> where --Ar-- is <IMG> or mixtures thereof, <IMG> is <IMG> , <IMG> or mixtures thereof Where -X, X1, X2, and X3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ethyl, -Z is -H, -X, -X1, -X2, or -X3 and R' is <IMG> , <IMG>,--o-- ,--s-- ,<IMG>, <IMG>, <IMG> D-5656 <IMG> <IMG> , or where n = 0 to 4 or alkylene radicals of 1 to 3 carbon atoms and -R"- is <IMG>,<IMG>, -o-, -s-,<IMG>,<IMG>, or <IMG>
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