期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 5, 页码 1747-1756出版社
AMER CHEMICAL SOC
DOI: 10.1021/am302959n
关键词
high dielectric constant; core-shell structure poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene); barium titanate nanoparticles; interfacial polarization
资金
- National Natural Science Foundation of China [51107081, 51277117]
- Research Fund for the Doctoral Program of Higher Education [20100073120038, 20120073110031]
- Shanghai Leading Academic Discipline Project [B202]
Polymer nanocomposites with the dielectric constant comparable to that of percolative composites are successfully prepared by using core shell structured hyperbranched aromatic polyamide grafted barium titanate (BT-HBP) hybrid nanofiller. Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (PVDF-TrFE-CFE) was used as the polymer matrix because of its high intrinsic dielectric constant and easy processability. The BT-HBP hybrid nanofiller were prepared by a solution polymerization of diaminobenzoic acid on the surface of amino-funcationalized BT nanoparticles. Nuclear magnetic resonance (H-1 NMR) and transmission electron microscopy (TEM) were used to verify the chemical structure of the hyperbranched aromatic polyamide and core-shell structure of the hybrid filler, respectively. It was found that the nanocomposite with 40 vol % BaTiO3-HBP had a dielectric constant of 1485.5 at 1000 Hz, whereas the corresponding nanocomposite sample with untreated BaTiO3 only showed a dielectric constant of 206.3. Compared with classic percolative composites, the advantage of the PVDF-TrFE-CFE/BaTiO3-HBP nanocomposites is that the composites show high enough breakdown strength and high dielectric constant simultaneously. An enhanced interfacial polarization mechanism between the BT-HBP and the polymer matrix was suggested for understanding the observed unusually high dielectric constant.
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