Electrical and Dielectrical Properties of Composites Based on Alumina and Cyclic Olefin Copolymers.

Autor: Ionete EI; National Research and Development Institute for Cryogenic and Isotopic Technologies-ICSI, 240050 Râmnicu Vâlcea, Romania., Visse A; Canoe Platform, CANOE-Le Centre Technologique Nouvelle Aquitaine Composites & Matériaux Avancés, Bât CHEMINNOV-ENSMAC, 33600 Pessac, France., Andrei RD; National Research and Development Institute for Cryogenic and Isotopic Technologies-ICSI, 240050 Râmnicu Vâlcea, Romania., Petreanu MI; National Research and Development Institute for Cryogenic and Isotopic Technologies-ICSI, 240050 Râmnicu Vâlcea, Romania., Spiridon SI; National Research and Development Institute for Cryogenic and Isotopic Technologies-ICSI, 240050 Râmnicu Vâlcea, Romania., Ionete RE; National Research and Development Institute for Cryogenic and Isotopic Technologies-ICSI, 240050 Râmnicu Vâlcea, Romania.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2024 Oct 31; Vol. 17 (21). Date of Electronic Publication: 2024 Oct 31.
DOI: 10.3390/ma17215349
Abstrakt: Understanding the performance of polymer dielectrics at different temperatures is becoming increasingly important due to the rapid development of electric cars, electromagnetic devices, and new energy production solutions. Cyclic olefin copolymers (COCs) are an attractive material due to their low water absorption, good electrical insulation, long-term stability of surface treatments, and resistance to a wide range of acids and solvents. This work focused on the dielectric and electrical properties of cyclic olefin copolymer (COC)/Al 2 O 3 composites over a wide range of temperature and frequency domains, from room temperature to cryogenic temperatures (around 125 K). Permittivity, electrical conductivity, and electrical modulus are given consideration. A composite of up to 50% Al 2 O 3 mixed with COC was prepared via a conventional melt-blending method. The final samples were formed in sheets and processed using injection and extrusion moldings. It was found that formulations with Al 2 O 3 concentrations ranging from 10 to 50% resulted in higher electrical conductivity while maintaining the viscosity of the composite at a level acceptable for polymer-processing machinery. Our data show that COC/alumina composites present substantial potential as materials for high-frequency applications, even at the regime of cryogenic temperatures.
Databáze: MEDLINE
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