Infrared Spectroscopy Analysis of Polymer Synthesis and Characterization

To eliminate residues and by-products, the polymers underwent a process of ethanol washing and purification, followed by drying and grinding. Subsequently, tablets were pressed using KBr at ambient temperature. Infrared (IR) analysis of the polymers was conducted, and the results are depicted in Fig. 1. Notably, a distinctive absorption peak in the range of 3443 cm-1 to 3202 cm-1 indicates the stretching vibration of the N-H bond [22]. The C-H bond exhibits evident absorption peaks at 2933 cm-1, while the symmetric stretching vibration of the CH2 group is represented by absorption peaks at 1454 cm-1 and 1411 cm-1 [26]. The stretching vibration of C-C is characterized by the absorption peak at 1189 cm-1. Furthermore, the C=O stretching vibration peak of the amide group appears at 1661 cm-1 [27], whereas the -SO32- group exhibits distinct symmetric and asymmetric absorption peaks at 1129 cm-1 and 1044 cm-1, respectively. These observations suggest the presence of targeted product groups, such as amide and sulfonic acid. Additionally, the vibrational mode of the extended methylene group demonstrates skewing at 780 cm-1. In conjunction with the analysis of static light scattering results, it can be concluded that the desired product has been successfully synthesized.