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Monolayer film of polyamic acid alkylamine salt at air–water interface was successfully deposited onto appropriate plates. Subsequent treatment of the multilayer film with a mixture of acetic anhydride and pyridine afforded the multilayer film of polyimide. The distance between two layers of the polyimide multilayer film was estimated to be 4 Å.

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Thin films of polyamic acid alkylamine salts which possess long alkyl side chain were successfully prepared at air–water interface. It was concluded that the polymer salts had a monolayer structure in which aromatic rings of the polyamic acids lied flat on the water surface.