Akademik Veri Yönetim Sistemi
Journal of Molecular Structure, cilt.1350, 2026 (SCI-Expanded)
In this study, we report for the first time the synthesis and complete characterization of a novel copolymer, poly(2-hydroxypropyl acrylate-co-1H-tetrazole) [P(2HPA-co-1HTz)] as an alternative proton conductive matrix. The structural analysis was confirmed by FT-IR and 1HNMR spectroscopy, while TGA and DSC analyses demonstrated sufficient thermal stability. SEM micrographs revealed a homogeneous morphology favorable for uniform charge transport. Proton conductivity (σ) measurements under completely anhydrous conditions revealed values of 3.53×10⁻5 S/m at 20 Hz and 1.95×10⁻4 S/m at 1 MHz at 420 K, substantially surpassing dry neat commercial membranes. Broadband dielectric measurements showed strong frequency and temperature dependence in both real (ε′) and imaginary (ε″) parts of dielectric constant. At low frequencies, ε′ values were highest and decreased sharply with frequency, converging above 1 kHz. Similarly, ε″ values increased with temperature, especially at low frequencies, suggesting enhanced segmental mobility and charge carrier response. Loss tangent (tanδ) analysis revealed no relaxation peak below 360 K, whereas clear peaks appeared from 370 K upwards. Relaxation times calculated from these peaks were τ = 3.33×10⁻3 s at 380 K (50 Hz), τ = 2.65×10⁻3 s at 400 K (60 Hz), and τ = 7.96×10⁻4 s at 430 K (200 Hz), indicating thermally activated relaxation behavior. Overall, the combination of structural stability, significant anhydrous ionic conductivity, and well-defined dielectric relaxation makes P(2HPA-co-1HTz) a strong SPE matrix candidate for electrochemical devices operating at elevated temperatures.