ArticleScientific reports2025
Design and thermal imidization of new 1,3-thiazine-based polyimides and copolyimides for high-performance corrosion inhibition.
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Abstract
A new polyimide, poly(1,3-thiazine imide) (PTzI), together with two co-polyimides (CoPTz-DsI and CoPTz-HaI), were synthesized from the monomer named 4,4'-(1,4-phenylene)bis(6-(benzene-2-yl)-6 H-1,3-thiazine-2-amine) (PTA), which has a di-1,3-thiazine heterocyclic structure. The structure of PTA was confirmed with FT-IR, along with NMR spectra and mass spectroscopy. A thermal imidization process was used to prepare PTzI from the corresponding polyamic acid (PAA), which was obtained by polycondensation of PTA with 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA). Similarly, the copolymers were synthesized via thermal imidization of PAAs derived from the polycondensation of PTA with 4,4'-diaminodiphenyl sulfone (DDS) or 1,6-hexane diamine (HAD), in addition to BTDA. The structure and imidization of each polymer were verified at various curing temperatures using Fourier transform infrared FT-IR spectroscopy. X-ray diffraction verified their amorphous nature, while scanning electron microscopy (SEM) morphological investigation indicated different levels of homogeneity and compactness. The rigid aromatic backbones and imide linkages provide exceptional thermal stability and chemical resistance, demonstrating their high performance. Thermogravimetric study (TGA and derivative TGA) showed that the materials had outstanding thermal stability, with high degradation initiation and initial decomposition temperatures (Td
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