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- Title
High dielectric properties and thermal conductivity of the PVDF-based composites with a low filler content reinforced by BaTiO<sub>3</sub>@super-short MWCNT core–shell particles.
- Authors
You, Yan-bin; Wang, Hai-yan; Li, Lan; Bai, Lin-rui; Dang, Zhi-Min
- Abstract
In order to improve the dielectric properties and the thermal conductivity of the PVDF-based composites, the BaTiO3@super-short MWCNT (BT@SSCNT) particles were modulated by a SSCNT shell fabricated by MWCNT with the different types (S-MWCNT-1020, S-MWCNT-2040). The average size of these particles is about 300 nm. With the increase in the external diameter of MWCNT, the SSCNT content of the BT@SSCNT particles decreases. However, the sum proportions of which the diameter of the particles is not less than 295 nm have a distinct growth leading to that the distance between the neighboring particles shortens. The dielectric constants of the composites are more than 355 and 1500 (103 Hz) at 10 wt% and 60 wt% filler loading, respectively. Compared with the BT@SSCNT/PVDF-1020 composites, the dielectric constants of the BT@SSCNT/PVDF-2040 composites have a more stable frequency dependency in the range of 102 to 106 Hz. The value of the composite with 10 wt% BT@SSCNT loading maintains more than 250 at 106 Hz. The introduction of the shell of SSCNT with larger external diameter can offer the composites a more desirable combined action of dielectric mechanisms, including interfacial polarization and micro-capacitor effect. In addition, the varying SSCNT shells also have evident influence on dielectric loss, breakdown strength, and thermal conductivity. It is worth mentioning that the values of the BT@SSCNT/PVDF-2040 composites are 334 and 0.16 (104 Hz), 229 kV mm−1, and 1.13 W (m K)−1 at 10 wt% filler loading, respectively. This work could extend the strategies for building the core–shell particles to develop dielectric nanocomposites.
- Subjects
DIELECTRIC properties; THERMAL properties; PERMITTIVITY; THERMAL conductivity; DIELECTRIC loss; DIELECTRICS
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 7, p4268
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-07620-9