Optical and temperature dependent electrical properties of poly (vinyl chloride)/copper alumina nanocomposites for optoelectronic devices / S. Suvarna in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 2 (2023) . - p. 154-156 Titre : Optical and temperature dependent electrical properties of poly (vinyl chloride)/copper alumina nanocomposites for optoelectronic devices Type de document : texte imprimé Auteurs : S. Suvarna, Auteur ; Annumaria Sebastian, Auteur ; Furhan, Auteur ; Manammel Thankappan Ramesan, Auteur Année de publication : 2023 Article en page(s) : p. 154-156 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Caractérisation Chlorure de polyvinyle Composites -- Propriétés optiques Cuivre Diélectriques Matériaux hybrides Modèles mathématiques Stabilité thermique Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : The practical applications of poly (vinyl chloride) have been constrained due to its poor thermal stability, low dielectric constant and inability to shield against ultraviolet (UV) radiation. In this study, we tried to improve the optical properties, thermal stability, temperature-dependent electrical conductivity and dielectric constant using copper alumina (Cu–Al2O3) nanoparticles reinforced poly (vinyl chloride) (PVC). Optical absorption measured with an ultraviolet-visible (UV-visible) spectrometer emphasises the blueshift in absorption edges and decreasing bandgap energies of PVC/Cu–Al2O3 nanocomposites compared to PVC. The presence of Cu–Al2O3 in PVC and its interaction with the polymer were confirmed by FTIR spectroscopy. Thermogravimetric analysis (TGA) demonstrates that nanocomposites have higher thermal stability than PVC, and that thermal stability increases with filler loading. Scanning electron microscopy (SEM) indicates the homogeneous dispersion of nanosized Cu–Al2O3 in the polymer matrix. The activation energy determined by the Arrhenius equation revealed that AC conductivity increases with the addition of nanoparticles up to a specific loading. The dielectric constant increases as a function of temperature and decreases with frequency. The magnitude of AC conductivity and dielectric constant were highest for 7 wt% loaded nanocomposites. The dielectric constant predicted by the Bruggeman and Maxwell-Garnet models were in good agreement with the experimental permittivity. The semiconducting nature of nanocomposites was investigated by impedance analysis. The semi-circular nature of Cole-Cole plots manifests the combination of parallel capacitance with low bulk resistance. The enhanced optical, thermal, electrical and dielectric properties of PVC/Cu–Al2O3 nanocomposites can be utilized in fabricating optoelectronic devices with excellent charge-storing ability. Note de contenu : - EXPERIMENTAL : Materials and methods - Synthesis of copper alumina nanoparticles - Preparation of poly (vinyl chloride)/copper alumina nanocomposites - Characterizations - RESULTS AND DISCUSSION : UV-visible spectroscopy - Optical bandgap energy - Fourier transform IR spectroscopy - SEM analysis - Thermogravimetric analysis - AC conductivity - Dielectric constant - Dielectric modelling - Impedance studies - Table 1 : Activation energy of PVC/Cu–Al2O3 nanocomposites at different frequencies DOI : https://doi.org/10.1515/ipp-2022-4270 En ligne : https://drive.google.com/file/d/1PiSW7w4CgwZjlcALwPviqWqCkaTm2GKW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39498 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24121	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 1 / 1)