PVC nanocomposites for cable insulation with enhanced dielectric properties, partial discharge resistance and mechanical performance

• Published in: High voltage 2020-08, Vol.5 (4), p.463-471
• Main Authors: Abdel-Gawad, Nagat M.K, El Dein, Adel Z, Mansour, Diaa-Eldin A, Ahmed, Hanaa M, Darwish, Mohamed M.F, Lehtonen, Matti
• Format: Article
• Language: English
• Subjects: 2 interfacial region; 2 interfacial region; amino silane; cable insulation; dielectric losses; different nanoparticle surface states; elastic moduli; electric breakdown; electrical performances; elongation; filled polymers; frequency 1.0 mhz to 20.0 mhz; frequency 1.0 MHz to 20.0 MHz; insulation cavity; internal partial discharges; mechanical performance; mechanical performances; mechanical properties; nanocomposites; nanocomposites preparation; nanoparticles; organic insulating materials; partial discharge resistance; permittivity; polarity; polyvinyl chloride; power cable insulation; PVC chains; PVC matrix; PVC nanocomposites; Research Article; surface state; surface tension; temperature 293.0 k to 298.0 k; temperature 293.0 K to 298.0 K; tensile strength; tio; TiO2; titanium compounds; titanium oxide; vinyl silane
• ISSN: 2397-7264; 2397-7264
• DOI: 10.1049/hve.2019.0116

The current study aims to develop polyvinyl chloride (PVC) nanocomposites with enhanced electrical and mechanical properties by incorporating titanium oxide (TiO2) nanoparticles within PVC chains. Different loading of nanoparticles and different nanoparticle surface states were considered. The surface states are unfunctionalised, functionalised using vinyl silane and functionalised using amino silane. The choice of a most suitable surface state was a critical factor that guarantees a good dispersion of nanoparticles and consequently enhances the compatibility between TiO2 and PVC matrix. The process followed in the PVC/TiO2 nanocomposites preparation, loaded with different wt.% of TiO2 nanoparticles, was the solvent method. The dielectric properties measured here were the relative permittivity (ɛr), dielectric loss (tanδ), breakdown strength (AC and DC under uniform field) and the internal partial discharges (PDs) within insulation cavity. All measurements have been performed under room temperature and at frequency ranged from 20 to 1.0 MHz. Furthermore, the mechanical properties of the samples like elongation, elasticity modulus and tensile strength were also studied. Vinyl silane showed better improvements in both electrical and mechanical performances compared to the amino silane, especially in cases of high weight fractions of TiO2. This is because of the improvement in the PVC-TiO2 interfacial region arise from the similarity of polarity and surface tension values of vinyl silane with that of PVC matrix and TiO2 nanoparticles.