期刊
POLYMER
卷 214, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123348
关键词
Polypropylene dielectric; Hybrid fillers; High-speed extrusion
资金
- Innovative Research Groups of the National Natural Science Foundation of China [51721091]
By designing a hybrid filler structure and improving filler dispersion, the permittivity of polypropylene was successfully increased while maintaining the electric breakdown strength, resulting in an increased energy density and suppressed dielectric loss.
Polypropylene (PP) is the state-of-the-art dielectric material for film capacitor. However, the further progress of PP is impeded by its low permittivity and low energy storage density. Adding high-permittivity (high-k) nano filler into PP matrix to prepare nanocomposites turns out to be a promising approach. Main challenge lies in the decreased electric breakdown strength (E-b) caused by the poor filler dispersion and the contrast between the intrinsic permittivity of high-k filler and low-k polymer matrix, which generated intensified electric field to lead breakdown. Herein, this issue is addressed by the design of a hybrid filler structure, wherein both low-k high-E-b hexagonal boron nitride (h-BN) and high-k low-E-b barium titanate (BT) were uniformly incorporated in PP matrix, meanwhile high-speed extrusion technology is applied to improve the filler dispersion. As a result, an obvious increase of permittivity from 2.2 to 2.92 was achieved compared with neat PP, while the E-b of PP/BT/BN was well-maintained at 469 MV/m, bringing an increased energy density of 2.82 J cm(-3). Moreover, the dielectric loss was impressively suppressed to a low value of 0.0012 via mixing of hybrid fillers and improved dispersion.
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