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How determined the amount of acetic anhydride and pyridine that was added to the polyimide synthesis solution?

sara stive
in Organic Chemistry

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I want to synthesis a polyimide from a diamine and a dianhydride in lab scale, in two-step synthesis route for fabrication the polyimides, in the second step, acetic anhydride and pyridine are added to the reaction mixture to separate the H2O and formed polyimide from polyamic acid, but how determined the amounts of this reagents?

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