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access icon openaccess Dielectric properties of epoxy silica and boron nitride nanocomposites and moisture/temperature influences

© The Institution of Engineering and Technology
Received 17/11/2017, Accepted 27/02/2018, Revised 05/02/2018, Published 04/04/2018

The epoxy resin was filled with nano-BN, surface treated, and untreated nano-SiO2. Measurements of dielectric spectroscopy cover the range of frequency from 10−2 to 105 Hz and will relate to the hydration of samples. It was observed from the results that permittivity of pure epoxy was strongly affected by the water absorptions and a bit of temperature. Then it will allow us to extract the influence of water absorption on dielectric properties and proposed a relatively reliable method by using Monte-Carlo simulation to estimate the average thickness of water shell or related relaxation peak of epoxy nanocomposites with spherical particles. At the end, the authors experimentally demonstrated the existence of two layer structure of water shell and concluded that surface treatment is able to reduce the water uptake, however, no obvious impact on modifying its effects on dielectric properties due to the limitation of thickness of tightly bonded layer. The ‘hydrophobic’ performance of BN nanocomposites is much better than silica ones, especially the no formation of water shell around the particles, and may be more suitable for application under environment with humidity.

Inspec keywords: filled polymers; nanotechnology; nanocomposites; permittivity; surface treatment; Monte Carlo methods; hydrophobicity; silicon compounds; resins; boron compounds; moisture

Other keywords: BN nanocomposites; pure epoxy; dielectric properties; water uptake; surface treatment; BN; SiO2; Monte-Carlo simulation; epoxy nanocomposites; water absorption; frequency 0.1 Hz to 100000.0 Hz; nanoBN; boron nitride nanocomposites; dielectric spectroscopy; epoxy resin; epoxy silica

Subjects: Dielectric permittivity; Modelling and computer simulation of solid structure; Methods of nanofabrication and processing; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Surface treatment and degradation of composites

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