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Reflectance IR spectra. PPy-NSE copolymers were synthesized from different pyrrole monomer ratios of pyrrole and pyrrole-NSE. Peaks at 1740, 1782 and 1814 cm−1 represent N-succinimidyl ester and pyrrolidinone, and those at 1550 cm−1 are typical for PPy rings. The peak at 1209 cm−1 is attributed to N–O stretching.
