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- Title
Synthesis, morphology, vibrational, and physical characterization of DGEBA epoxy doped liquid crystal organic polymeric systems (EDLCPSs) for high-performance embedded capacitors.
- Authors
Jilani, W.; Bouzidi, A.; Elleuch, Slim; Guermazi, H.
- Abstract
The synthesis, morphology, and physical characterization of neat epoxy and DGEBA epoxy doped liquid crystal organic polymeric systems (EDLCPSs) have been investigated. Morphological properties of both systems were examined by SEM techniques. The small size of the LC droplets (0.224 μm) is also consistent with the presence of nitrile groups. The Fourier transform infrared (FTIR) and Raman spectra of the EDLCPSs detect a vibration band at 2229 cm−1 is attributed to C≡N stretching vibrational band. The optical band gap and refractive index have been studied using UV–visible spectroscopy. The calculated optical band gap of the EDLCP system shows a red shift as compared to neat epoxy. Our optical parameters were found to increase in the EDLCPSs. In the UV region, the systems block UV light up to a wavelength of about 380 nm which is an efficiency of UV light shielding devices. The photoluminescence (PL) is measured as a function of temperature for both systems. The integrated PL intensity decreases below 300 °C for the neat epoxy and lower than 220 °C for the EDLCPSs when increasing temperature is an effect related to the phonon diffusion (i.e., the photo-created pairs electron–hole). After 320°C, the neat epoxy system shows a completely inverted behavior when increasing temperature. On the other hand, the EDLCPSs revealed this comportment after 240 °C. The rise in thermal PL intensity was assigned to the variation in energy band gap transition and exchanges of the N1 and N2 deep levels nature.
- Subjects
EPOXY resins; POLYMER liquid crystals; VIBRATIONAL spectra; SCANNING electron microscopy; CAPACITORS; ULTRAVIOLET-visible spectroscopy; ENERGY bands
- Publication
Optical & Quantum Electronics, 2024, Vol 56, Issue 4, p1
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-024-06299-6