Akademik Veri Yönetim Sistemi
JOURNAL OF MOLECULAR STRUCTURE, cilt.1363, 2026 (SCI-Expanded, Scopus)
Sulfonic acid functionalization represents an effective strategy for improving the processability, photophysical behavior, and thermal performance of conjugated polymers. In this work, a series of dialdehyde monomers and their corresponding sulfonated poly(azomethine-ether)s were synthesized and comprehensively characterized. Dialdehyde monomers bearing flexible aliphatic and ether spacers were first prepared and subsequently polycondensed with 4,4 '-diamino-2,2 '-biphenylsulfonic acid to obtain the target polymers. Structural features were confirmed by FT-IR, UV-Vis, 1H NMR and 13C NMR spectroscopy. Gel permeation chromatography (GPC) revealed moderate molecular weights (Mw = 11.2-15.6 kDa) with narrow polydispersity indices (1.12-1.16), indicating a uniform polymer population and consistent chain growth. Optical investigations showed relatively wide band gaps (3.22-3.45 eV), while the presence of electron-withdrawing sulfonic acid groups resulted in high HOMO energy levels and bright blue photoluminescence under short-wavelength excitation. X-ray diffraction analysis demonstrated a layered crystalline arrangement characteristic of semiflexible polymers incorporating aliphatic segments. Thermal and flame-retardant analyses demonstrated a slow-burning profile and strong ignition resistance, as indicated by the LOI values, highlighting the suitability of these polymers for safety-critical applications. Overall, the combination of molecular uniformity, thermal stability, flame resistance, and blue photoluminescence suggests that these sulfonated poly(azomethine-ether)s are promising candidates for advanced functional materials.