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Eight imide‐diacids were synthesized from trimellitic anhydride, pyromellitic anhydride and aminoacids of the formula HOOC(CH 2 ) n NH 2 , with n = 1,2,3,5. From them, polyanhydride‐imides were obtained following a general method of formation of polyanhydrides in the presence of acetic anhydride 1,2 . These co‐polyimides have an aliphatic‐aromatic structure and the relation between the general properties and the amount of the aliphatic part in the repeat unit was studied. IR spectroscopy, elemental analysis and viscosity measurements were used for the characterization. Studies of solubility, hydrolysis resistance and thermal properties were also made.
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González et al. (1976) studied this question.
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