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Hybrid-coatings derived from pyromellitic acid bridged alkoxy-silylalkyl precursors

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Abstract

To achieve high temperature stable insulation materials for the electrical insulation of fine copper wires two different bis(alkoxysilylalkyl)pyromellitamide acids 1 and 2 were prepared. These organic–inorganic sol–gel hybrid precursors were obtained via reactions of pyromellitic dianhydride and alkoxysilylalkylamines. The molecular single-source precursors 1 and 2 were comprehensively studied using FT-IR, 1H, 13C and 29Si NMR spectroscopy as well as elemental analyses. Besides, the hydrolysis and condensation processes of the different precursors were examined with solution 29Si NMR spectroscopy. The imidization process was investigated using 13C NMR spectroscopy, FT-IR spectroscopy as well as thermal analysis methods. The different precursors were applied to coat fine copper wires using an industrial coating device. The obtained coatings were cured at temperatures between 380 and 425 °C, and tested regarding thicknesses, number of pinholes, electrical breakdown voltage and elongation. FT-IR spectroscopy was used to determine the chemical structure and scanning electron microscopy to investigate the morphology of the coating materials. The obtained coatings showed very promising mechanical, thermal and electrical properties, i.e. highest breakdown voltage values well above 200 V/µm. They possess high flexibility without cracking and no pinholes or other defects were detected.

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Acknowledgments

We would like to thank Dana Schmidt (TU Bergakademie Freiberg) for her help measuring liquid NMR spectra. This project was supported by a Grant (FKZ1775X05) from the FH³ BMBF program in the context of cooperative project “Entwicklung einer nanoskaligen Kupferlackdrahtbeschichtung für den Einsatz in der Automobil- und Medizintechnik (NanoCuL)”. We thank the people working for ISODRA for help with the copper wire coating experiments.

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09596, Freiberg, Germany

    Stefan Pfeifer & Edwin Kroke

  2. Institute of Analytical Chemistry, TU Bergakademie Freiberg, Leipziger Str. 29, 09596, Freiberg, Germany

    Erica Brendler

  3. Laboratory of Biophysics, Westphalian University of Applied Sciences, August-Schmidt-Ring 10, 45665, Recklinghausen, Germany

    Michael Veith

Authors
  1. Stefan Pfeifer
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  2. Erica Brendler
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  3. Michael Veith
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  4. Edwin Kroke
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Correspondence to Edwin Kroke.

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Pfeifer, S., Brendler, E., Veith, M. et al. Hybrid-coatings derived from pyromellitic acid bridged alkoxy-silylalkyl precursors. J Sol-Gel Sci Technol 70, 191–202 (2014). https://doi.org/10.1007/s10971-014-3343-3

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  • DOI: https://doi.org/10.1007/s10971-014-3343-3

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