Core-shell structured hyperbranched aromatic polyamide/BaTiO3 hybrid filler for poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) nanocomposites with the dielectric constant comparable to that of percolative composites.
Core-shell structured hyperbranched aromatic polyamide/BaTiO3 hybrid filler for poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) nanocomposites with the dielectric constant comparable to that of percolative composites.
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DOI：
10.1021/am302959n
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发表时间：
2013-02
影响因子：
9.5
通讯作者：
Liyuan Xie;Xingyi Huang;Yanhui Huang;Ke Yang;P. Jiang
中科院分区：
文献类型：
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作者：
Liyuan Xie;Xingyi Huang;Yanhui Huang;Ke Yang;P. Jiang
采用核-壳结构超支化芳族聚酰胺接枝钛酸钡（BT-HBP）杂化纳米填料，成功制备了介电常数与渗透复合材料相当的聚合物纳米复合材料。聚偏氟乙烯-三氟乙烯-氯氟乙烯（PVDF-TrFE-CFE）因其固有介电常数高、易加工而被用作聚合物基体。采用二氨基苯甲酸在氨基功能化BT纳米颗粒表面溶液聚合的方法制备了BT- hbp杂化纳米填料。采用核磁共振（(1)H NMR）和透射电镜（TEM）分别对超支化芳香族聚酰胺的化学结构和杂化填料的核壳结构进行了验证。结果表明，含40 vol % BaTiO3- hbp的纳米复合材料在1000 Hz时的介电常数为1485.5，而未含BaTiO3的纳米复合材料样品的介电常数仅为206.3。与传统的渗透复合材料相比，PVDF-TrFE-CFE/BaTiO3-HBP纳米复合材料的优点是同时具有足够高的击穿强度和高介电常数。BT-HBP与聚合物基体之间的界面极化机制被认为可以解释所观察到的异常高介电常数。
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 ((1)H 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.