Improved Dielectric Breakdown Strength of Polyimide by Incorporating Polydopamine-Coated Graphitic Carbon Nitride

• Published in: Polymers Vol. 14; no. 3; p. 385
• Main Authors: Dong, Yinjie, Wang, Zhaoyang, Huo, Shouchao, Lin, Jun, He, Shaojian
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 19.01.2022; MDPI
• Subjects: breakdown strength; Carbon; Carbon nitride; Composite materials; Dielectric breakdown; Dielectric properties; Dielectric strength; Dopamine; Energy storage; Fillers; graphitic carbon nitride nanosheets; Heat conductivity; Hydroxyl groups; interfacial interaction; Mechanical properties; Nanostructure; Permittivity; polydopamine; polyimide; Polyimide resins; Polymers; Beijing China; China; interfacial interaction; graphitic carbon nitride nanosheets; polydopamine; polyimide; breakdown strength
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14030385

Breakdown strength is an important parameter for polymer dielectric, and introducing inorganic filler into the polymer matrix is an efficient method to improve the breakdown strength. In this work, graphitic carbon nitride nanosheets (CNNS) were ultrasonically exfoliated and coated with polydopamine to obtain modified nanosheets (DCNNS), and then polyimide (PI) composite films with various CNNS and DCNNS were prepared and compared. Owing to the abundant hydroxyl groups of polydopamine, good filler-polymer compatibility and uniform filler dispersion were achieved for PI/DCNNS composites. Both breakdown strength and dielectric constant were improved with the addition of either CNNS or DCNNS. However, at the same filler content, the PI/DCNNS composites exhibited higher breakdown strength and dielectric constant than the PI/CNNS. The PI composite with 0.5 wt% DCNNS showed the highest breakdown strength of ~300 kV/mm, increased by 67.6% as compared to the pure PI, while the PI/CNNS composite with the same filler content only increased by 14.5%.