TY  - JOUR
A1  - Pfeifer, Stefan
A1  - Brendler, Erica
A1  - Veith, Michael
A1  - Kroke, Edwin
T1  - Hybrid-coatings derived from pyromellitic acid bridged alkoxy-silylalkyl precursors
T2  - Journal of Sol-Gel Science and Technology
N2  - 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.
Y1  - 2014
UR  - https://whge.opus.hbz-nrw.de/frontdoor/index/index/docId/2832
SN  - 1573-4846
VL  - 70
IS  - 2
SP  - 191
EP  - 202
PB  - Springer
CY  - Dordrecht
ER  -