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首页> 外文期刊>Journal of Applied Polymer Science >Dielectric property of modified barium titanate/polyamide 11 nanocomposites with different surfactants
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Dielectric property of modified barium titanate/polyamide 11 nanocomposites with different surfactants

机译：不同表面活性剂改性钛酸钡/聚酰胺11纳米复合材料的介电性能

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摘要

Barium titanate/polyamide 11 (BT/PA11) nanocomposites were prepared by modifying BT nanoparticles with dry surface modification process, which had well dispersion, high dielectric constant, and low dielectric loss. Various methods were reported to improve dispersion and compatibility with complex process and high cost. Herein, three surfactants [gamma-aminopropyl triethoxy silane (KH550), sorbitan monostearate (SP60), and octadecyl phosphate ester (OPE)] were chosen to modify BT nanoparticles. Then modified-BT nanoparticles were blended with PA11. The structure was characterized by Fourier transform infrared, scanning electron microscope, and wide angle X-ray diffraction. Dielectric property was studied by broadband dielectric spectroscopy. The frequency dependence and temperature dependence of dielectric constant, dielectric loss, and dielectric modulus were analyzed. In general, dielectric property has strong frequency and temperature dependence. Furthermore, dielectric spectra shows that modified BT/PA11 nanocomposites have higher dielectric constant, lower dielectric loss, fewer interface polarization, and more dipole polarization. In contrast to three surfactants, OPE-BT nanoparticles have better effects, whose dielectric constant increases from 19 to 28 at 1 Hz, and dielectric loss decreases from 0.36 to 0.23. Meanwhile, mechanical property was characterized by universal testing machine. In all, the work improves dispersion of BT nanoparticles and dielectric property with easy process and low cost. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47447.
机译：通过用干燥表面改性工艺改性Bt纳米颗粒，制备钛酸钡/聚酰胺11（BT / PA11）纳米复合材料，其具有良好的分散，高介电常数和低介电损耗。据报道，各种方法改善了复杂过程和高成本的分散和兼容性。在此，选择三种表面活性剂[γ-氨基丙基三乙氧基硅烷（KH550），脱水果醇单碳酸酯（SP60）和十八烷基磷酸酯（OPE）]以改性BT纳米颗粒。然后将改性-BT纳米颗粒与PA11共混。该结构的特征在于傅里叶变换红外，扫描电子显微镜和广角X射线衍射。通过宽带介电光谱研究介电性能。分析了介电常数，介电损耗和介电模量的频率依赖性和温度依赖性。通常，介电性具有强的频率和温度依赖性。此外，介电光谱表明，改进的BT / PA11纳米复合材料具有更高的介电常数，介电损耗，较少的界面偏振，以及更多的偶极偏振。与三种表面活性剂相反，OPE-BT纳米颗粒具有更好的效果，其介电常数在1 Hz的19至28增加，并且介电损耗从0.36降低到0.23。同时，机械性能的特点是通过通用试验机。总而言之，该工作改善了BT纳米颗粒和介电性能的分散，易于工艺和低成本。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47447。

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