高填充钛酸钡/氟硅橡胶纳米复合材料制备及介电性能调控
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国家数值风洞工程(NNW);国家自然科学基金资助项目(11747042);环境友好能源材料国家重点实验室基金(19FKSY0102)


Preparation and Dielectric Properties of Highly Filled Barium Titanate/Fluorinated Silicone Rubber Nanocomposites
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    摘要:

    通过阴离子聚合手段合成出三氟丙基含量可控的聚氟硅氧烷,并利用“巯基-乙烯基”点击技术制备出高填充钛酸钡/氟硅橡胶(BT/FSR)纳米复合材料。结果表明,硅橡胶均匀包覆在钛酸钡纳米粒子表面并彼此黏接,使纳米粒子在基体中分散均匀、界面致密,引入三氟丙基并未影响高填充高分子微观形貌,有效避免了界面缺陷和抑制了界面极化。其次,在103 Hz下,质量分数88% BT/FSR纳米复合材料的介电常数高达60.1,与88% BT/SR纳米复合材料相比提升了23.9,而介电损耗仍低于0.03,并可通过控制氟硅橡胶基体中三氟丙基含量调控介电性能。

    Abstract:

    Integrating high-loading dielectric nanoparticles into polar polymer matrices potentially can make full use of the intrinsic polarization of each phase and allow for greatly enhanced dielectric properties in polymer nanocomposites. However, it is hugely difficult to make nanoparticles disperse and maintain interfacial compatibility in highly filled polar polymer composites, which is closely related to the overall dielectric properties, such as dielectric loss. Here, a polyfluorosiloxane with controlled amounts of trifluoropropyl was synthesized by anionic polymerization and highly filled barium titanate/fluorinated silicone rubber (BT/FSR) nanocomposites were fabricated by ‘thiol-ene click’ technique. The results indicate BT nanoparticles are uniformly coated and adhered with fluorinated silicone rubber. The polar group (—CH2CF3) of the polymer matrix does not affect the microstructure of highly filled polymer nanocomposites. Then the uniform dispersion of nanoparticles and compact interface avoid interfacial defects and restrain interfacial polarization. In addition, the dielectric constant of 88% BT/FSR nanocomposite reaches 60.1, which displays 23.9 enhancement to that of 88% BT/SR nanocomposite at 103 Hz, while their dielectric losses are no more than 0.03. Besides, the dielectric properties of BT/FSR nanocomposite can be tailored via controlling the amount of trifluoropropyl in fluorinated silicone rubber.

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张全平, 陈瑞超, 杜芳艳, 刘 修, 李银涛, 杨文彬, 周元林.高填充钛酸钡/氟硅橡胶纳米复合材料制备及介电性能调控[J].高分子材料科学与工程,2022,38(2):17-23.

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  • 在线发布日期: 2022-05-26
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