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Improved Dielectric Breakdown Strength of Polyimide by Incorporating Polydopamine-Coated Graphitic Carbon Nitride. Polymers (Basel) 2022; 14:polym14030385. [PMID: 35160375 PMCID: PMC8838390 DOI: 10.3390/polym14030385] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 02/04/2023] Open
Abstract
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%.
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Yang Y, Gao J, Lei T, Yang J, Wang J, Liu J. Thermal conductivity and mechanical properties of polyimide composites with mixed fillers of BN flakes and
SiC
@SiO
2
whiskers. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25360] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yang Yang
- State Key Laboratory of Powder MetallurgyCentral South University Changsha China
- Zhuzhou Times New Material Technology Co., Ltd Zhuzhou China
| | - Jiming Gao
- Zhuzhou Times New Material Technology Co., Ltd Zhuzhou China
| | - Ting Lei
- State Key Laboratory of Powder MetallurgyCentral South University Changsha China
| | - Jun Yang
- Zhuzhou Times New Material Technology Co., Ltd Zhuzhou China
| | - Jin Wang
- Zhuzhou Times New Material Technology Co., Ltd Zhuzhou China
| | - Jie Liu
- Zhuzhou Times New Material Technology Co., Ltd Zhuzhou China
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