Mussel-inspired polydopamine functionalized silicon carbide whisker for PVDF composites with enhanced dielectric performance

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Xianwu Cao
  • Wanjing Zhao
  • Dongli Zhang
  • Junwei Zha
  • Xinmao Yin

Detail(s)

Original languageEnglish
Article number106486
Journal / PublicationComposites Part A: Applied Science and Manufacturing
Volume148
Online published27 May 2021
Publication statusPublished - Sep 2021

Abstract

Dielectric polymer composites with high dielectric constant and low dielectric loss are highly demanded for various types of devices. In this work, the core–shell structured polydopamine functionalized silicon carbide whiskers (SiC@PDA) were successfully synthesized. The presence of PDA effectively suppressed the dielectric loss of PVDF/SiC@PDA composites because it could inhibit the connection between fillers and reduce the interfacial polarity. Moreover, the thicker PDA layer contributed to improving dielectric breakdown strength and reducing AC conductivity of PVDF composites. The insulating PVDF/SiC@PDA-a-30 composite containing 30 wt% of SiC@PDA-a had a dielectric constant of 35.1 while the dielectric loss still maintained as low as 0.037 at 1 KHz. Meanwhile, PVDF/SiC@PDA-a-30 achieved the maximum stress of 58.8 MPa with elongation at break of 17.3% due to PDA layer improved the compatibility between SiC@PDA and PVDF. This simple coated PDA shell strategy could be extended to inorganic fillers to develop high performance dielectric polymer composites.

Research Area(s)

  • Dielectric, Mechanical property, Polydopamine, Silicon carbide, Thermal stability

Citation Format(s)

Mussel-inspired polydopamine functionalized silicon carbide whisker for PVDF composites with enhanced dielectric performance. / Cao, Xianwu; Zhao, Wanjing; Gong, Xianjing; Zhang, Dongli; Su, Qijun; Zha, Junwei; Yin, Xinmao; Wu, Wei; Li, Robert K.Y.

In: Composites Part A: Applied Science and Manufacturing, Vol. 148, 106486, 09.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review