Chemical Polymerization Kinetics of Poly-O-Phenylenediamine and Characterization of the Obtained Polymer in Aqueous Hydrochloric Acid Solution Using K₂Cr₂O₇ as Oxidizing Agent

Table 3

Infrared absorption bands and their assignments of o-phenylene-diamine monomer (OPDA) and its analogs polymer (POPDA).

Wave number (cm^−1)		Assignments
(OPDA); Monomer	(POPDA); Polymer
453^m	—	Bending deformation of NH in primary aromatic amines
—	518^m
748^b	—	Out-of-plane bending deformation of CH in 1,2 disubstituted in benzene ring
—	761^b
810^s	—	Out-of-plane deformation showing 1,4-disubistuition in the benzene ring
—	833^sh
924^s	—	Plane C–H deformation of 1,2-disubistuition of benzene ring
—	1044^w
1056^m	—
1117^s	—
—	1133^w
1152	—
1336^s	1362^sh	Symmetric stretching vibration for C–O or C–N group
1490^s	1500^b	Symmetric stretching vibration for C–C aromatic
1590^s	—	Stretching vibration of C–N or combination band for protonated primary aromatic amine
1630^s	1621^b	N–H deformation of secondary amine
3032^sh	—	Symmetric stretching vibration of N–H
3281^s	3354^m	Asymmetric stretching vibration for NH
2930^sh	3354^b	Asymmetric stretching vibration for CH group in aliphatic chain
3370^s	—	Symmetric stretching vibration of =C–H

s: sharp; m: medium; w: weak; b: broad; sh: shoulder.