Multifunctional Properties of Cyanate Ester Composites with SiO2 Coated Fe3O4 Fillers

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• 作者：Weixing Sun ; Wuzhu Sun ; Michael R. Kessler ; Nicola Bowler ; Kevin W. Dennis ; R. William McCallum ; Qi Li ; Xiaoli Tan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：March 13, 2013
• 年：2013
• 卷：5
• 期：5
• 页码：1636-1642
• 全文大小：431K
• 年卷期：v.5,no.5(March 13, 2013)
• ISSN：1944-8252

文摘

SiO₂ coated Fe₃O₄ submicrometer spherical particles (a conducting core/insulating shell configuration) are fabricated using a hydrothermal method and are loaded at 10 and 20 vol % into a bisphenol E cyanate ester matrix for synthesis of multifunctional composites. The dielectric constant of the resulting composites is found to be enhanced over a wide frequency and temperature range while the low dielectric loss tangent of the neat cyanate ester polymer is largely preserved up to 160 掳C due to the insulating SiO₂ coating on individual conductive Fe₃O₄ submicrometer spheres. These composites also demonstrate high dielectric breakdown strengths at room temperature. Dynamic mechanical analysis indicates that the storage modulus of the composite with a 20 vol % filler loading is twice as high as that of neat resin, but the glass transition temperature considerably decreases with increasing filler content. Magnetic measurements reveal a large saturation magnetization and negligibly low coercivity and remanent magnetization in these composites.

Keywords:

SiO₂ coated Fe₃O₄ submicrometer spheres; polymer鈭抦atrix composites; dielectric properties; mechanical stiffening; superparamagnetic behavior