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The differential spectrum of the two initiating systems (a) KPS-NaHSO3 and (b) KPS-PA at the wavelengths of 1300–1100 cm−1. (c) The derivative curves of differential spectrum of KPS-PA at the wavelengths of 1300–1100 cm−1. (d) Synchronous and (e) asynchronous 2D IR spectrum of the polymerization of AM initiated by KPS-PA. (f) 1H-NMR spectrum of pentamethylene triamine (PA).
