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ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Published monthly
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Realizing low-level electrical leakage conductance of PVC based dielectric composites containing amorphous carbon spheres
Zhibin Geng and Xili Pan
School of Automotive Engineering, Xiangyang Polytechnic, Xiangyang, People’s Republic of China
E-mail: a346974760@163.com
Received: 9 April 2024 Accepted: 19 June 2024
Abstract: Carbon nanotubes (CNTs) are used to prepare polymer composites with a high dielectric constant. However, a high leakage conductance is undesirable. Herein, amorphous carbon spheres were used to replace single-walled CNTs (SWCNTs) to fabricate polyvinyl chloride (PVC) composites. Two sets of composite films, marked with PVC/SWCNT and PVC/carbon sphere, were prepared. Dielectric, conductive and breakdown traits of composites were determined. PVC/carbon sphere composites display more advantageous properties than PVC/SWCNT composites. Unlike SWCNTs, carbon spheres exhibit a mild interface polarization with PVC and no percolation, resulting in balanced electric properties of composites including a rationally increased dielectric constant, greatly reduced dielectric loss and significantly improved breakdown strength. The optimal PVC composite with 12 wt% carbon spheres has a dielectric constant of ~ 186, dielectric loss of ~ 0.19 at 100 Hz, and breakdown strength of ~ 333 MV m−1. This work boosts a large-scale fabrication of outstanding composites used in modern capacitors.
Keywords: Polymers; Leakage conductance; High dielectric constant; Composite films; Carbon spheres; Single-walled carbon nanotubes
Full paper is available at www.springerlink.com.
DOI: 10.1007/s11696-024-03581-5
Chemical Papers 78 (12) 6989–6999 (2024)
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