☆ 4.6 Article

Functionalized mesoporous silica liquid crystal epoxy resin composite: an ideal low-dielectric hydrophobic material

JOURNAL OF MATERIALS SCIENCE (2022)

Journal

JOURNAL OF MATERIALS SCIENCE

Volume 57, Issue 2, Pages 1156-1173

Publisher

SPRINGER

DOI: 10.1007/s10853-021-06672-w

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Funding

Guangzhou Science and Technology Program Key Projects [201904010244]

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Abstract

This study investigates the preparation of liquid crystal epoxy resin and functionalized mesoporous silica to successfully fabricate composite materials with excellent dielectric properties and hydrophobicity. These composite materials have significant application value in the field of microelectronic devices and 5G communication.

The field of microelectronic devices and 5G communication has an increasing demand for polymer composites with low dielectric constant, low dielectric loss, and good hydrophobicity. However, traditional polymer composites cannot simultaneously satisfy them, which severely hinders their application. In this work, a liquid crystal epoxy resin (LCE4) consisted of a flexible chain and rigid mesogenic unit was prepared and cured with methylhexahydrophthalic anhydride (MHHPA). And the mechanism of the curing reaction and the phase structure of the liquid crystal epoxy resins were investigated. In addition, dielectric hydrophobic liquid crystal epoxy nanometer composite materials were successfully prepared with functionalized mesoporous silica (SBA-15) as a filler. The results showed that pure LCE4 exhibited excellent dielectric properties and thermal stability. Compared with pure LCE4, the composite material for SBA-15 modified with KH560 displayed lower dielectric constant, lower dielectric loss, higher glass transition temperature, and better hydrophobicity. For example, with a 0.5 wt% SBA-15, the dielectric constant and dielectric loss of the composite material were as low as (2.35, 0.025) compared with pure LCE4 (3.25, 0.036) that was reduced by 24.7% and 31%. In addition, the glass transition temperature and water contact angle are increased by 16 degrees C and 14 degrees, respectively. Composites also showed good thermal stability and mechanical properties. The reasons may mainly be derived from the internal structure of LCE4, the effective modification of mesoporous SBA-15 by KH560, and the excellent dispersion of organic and inorganic phases. [GRAPHICS] .

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Comparative Studies of the Dielectric Properties of Polyester Imide Composite Membranes Containing Hydrophilic and Hydrophobic Mesoporous Silica Particles

Kuan-Ying Chen, Minsi Yan, Kun-Hao Luo, Yen Wei, Jui-Ming Yeh

Summary: In this paper, the impact of hydrophilic and hydrophobic mesoporous silica particles (MSPs) on the dielectric properties of their derivative polyester imide (PEI) composite membranes was studied. Hydrophilic and hydrophobic MSPs were synthesized through a base-catalyzed sol-gel process, using D-(-)-Fructose as the pore-forming agent. The loaded MSPs significantly affected the dielectric constant and loss tangent of the prepared membranes. Higher loading of hydrophilic MSPs led to higher dielectric constant and loss tangent values, while higher loading of hydrophobic MSPs resulted in lower dielectric constant values with almost unchanged loss tangent.

MATERIALS (2023)