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Few-layer boron nitride nanosheets/poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) dielectric nanocomposite functionalized with grafting POSS copolymer

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Abstract

The development of advanced film capacitors for the energy storage and conversion has attracted tremendous attentions to fulfill the applications of electrical power supplies. The polymer-based composite with large dielectric property and discharged energy capability is promising candidate for film capacitor. Here, polymer composite film with high polarization was prepared by blending poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) terpolymer and functionalized few-layer boron nitride nanosheets (BNNSs). The hyperbranched polyethylene-grafting-polyhedral oligomeric silsesquioxane (HBPE-g-POSS) copolymer was synthesized to exfoliate BNNSs from h-BN bulk in chloroform with assistance of ultrasonication. The morphologies of BNNSs have been characterized by high-resolution transmission electron microscopy and atomic force microscopy, which confirm the resultant nanosheet with lateral size of 100–200 nm and thickness of 1.2–1.8 nm. The presence of Si peak in X-ray photoelectron spectroscopy indicates that the hyperbranched copolymer is attached on surface of nanosheets. The received few-layer BNNSs were incorporated into P(VDF-TrFE-CFE) matrix via solution casting method. The relative content of electroactive phase in nanocomposite is enhanced because of strong interaction between fluoropolymer and HBPE-g-POSS during crystallization. The dielectric constant increases to 21.2 with dielectric loss of 0.04 at 100 Hz for 0.5 wt% nanocomposite, and released energy density of 8.3 J/cm3 with charge–discharge efficiency of 52% at 325 MV/m is also achieved in current film, which is attributed to large interfacial polarization with HBPE-g-POSS neighboring layer between nanosheet and polymer matrix. This work on few-layer BNNSs/fluoropolymer nanocomposite with hyperbranched copolymer interface establishes an effective route to develop polymer composite with high energy capability for flexible film capacitor.

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Acknowledgements

The financial support from the Natural Science Foundation of Zhejiang Province of China (LTZ20E070001, 2021C01089) and National Natural Science Foundation of China (51707175) is greatly appreciated.

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  1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Huijian Ye, Shujie Hu, Bo Han & Lixin Xu

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  1. Huijian Ye
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Ye, H., Hu, S., Han, B. et al. Few-layer boron nitride nanosheets/poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) dielectric nanocomposite functionalized with grafting POSS copolymer. J Mater Sci 57, 1006–1018 (2022). https://doi.org/10.1007/s10853-021-06698-0

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