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SYNOPSISModel compounds for imines formed during the thermal curing of short chain polyimides have been synthesized and characterized. These compounds have imine bonds ( C = N ) formed by the nucleophilic attack of primary amines on imide carbonyls. The C = N stretching mode appears at 1649-1664 cm-' in the Raman and infrared spectra of these compounds and the band assigned to the carbonyl mode in an imide ring with an imine bond appears near 1740 cm-' . These compounds have been prepared and characterized to verify the conclusions of a previously reported study in which bands observed in thermally cured short chain polyimides a t 1656 and 1742 cm-' were assigned as the C=N and associated C =O modes, respectively. It has also been confirmed that the C = N stretching mode in the imide model compounds is inherently IR weak and can only be seen if the concentration of imine species is high. 0 1993 John Wiley & Sons, Inc.

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