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SOLUBLE POLYIMIDES PREPARED FROM 2,4-DIAMINOISOPROPYLBENZENE AND PYROMELLITIC DIANHYDRIDE AND 3,4,3',4'-BENZOPHENONETETRACARBOXYLIC DIANHYDRIDE
SOLUBLE POLYIMIDES PREPARED FROM 2,4-DIAMINOISOPROPYLBENZENE AND PYROMELLITIC DIANHYDRIDE AND 3,4,3',4'-BENZOPHENONETETRACARBOXYLIC DIANHYDRIDE