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Functional epoxy composites for high voltage insulation involving c-BN and reactive POSS as compatibilizer

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Abstract

Epoxy resins modified with only polyhedral oligomeric silsesquioxanes (POSS) or cubic boron nitride (c-BN), as well as multiphase composites (MP) containing both POSS and c-BN were fabricated and investigated. Two different types of reactive liquid POSS with molecular sizes of approximately 2 nm, viz. triglycidylisobutyl-POSS and glycidyl-POSS were added in contents of 1 wt% to form single-phase and multiphase composites. Submicrometric c-BN, in contents of 5 wt%, was used for the respective single-phase composite as well as in the multiphase samples to create multifunctional nanostructured composites. All specimens were characterized by Broadband Dielectric Spectroscopy, dielectric breakdown experiments, differential scanning calorimetry, and thermal conductivity measurements. The single-phase POSS composites have recorded up to 15 % improved dielectric breakdown strengths and enhanced thermal conductivities by up to 20 %. The single-phase c-BN composite revealed the most distinct improvement in thermal conductivity of more than 25 %, along with a reduction in dielectric breakdown strength of approximately 18 %. In addition, the dielectric and thermal properties of the MP composites containing 1 wt% POSS and 5 wt% c-BN were found to be solely dictated by the submicrometric c-BN particles. SEM observations revealed a significantly improved dispersion of the c-BN particles in the presence of POSS for the MP composites, suggesting that POSS acts as a compatibilizer between organic epoxy matrix and inorganic filler particles.

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Acknowledgements

Hydro-Québec and the Natural Sciences and Engineering Research Council of Canada (NSERC) are gratefully thanked for their financial support.

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Authors and Affiliations

  1. École de technologie supérieure (ETS), Montreal, QC, Canada

    Thomas Heid & Eric David

  2. Institut de recherche d’Hydro-Québec (IREQ), Varennes, QC, Canada

    Thomas Heid & Michel F. Fréchette

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  1. Thomas Heid
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  2. Michel F. Fréchette
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  3. Eric David
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Correspondence to Thomas Heid.

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Heid, T., Fréchette, M.F. & David, E. Functional epoxy composites for high voltage insulation involving c-BN and reactive POSS as compatibilizer. J Mater Sci 50, 5494–5503 (2015). https://doi.org/10.1007/s10853-015-9095-9

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  • DOI: https://doi.org/10.1007/s10853-015-9095-9

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