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Enhancement of the Insulation Properties of Poly(2‐oxazoline)‐ co ‐Polyester Networks by the Addition of Nanofillers
Author(s) -
Eibel Alexander,
Marx Philipp,
Jin Huifei,
Tsekmes IoannisAlexandros,
Mühlbacher Inge,
Smit Johan J.,
Kern Wolfgang,
Wiesbrock Frank
Publication year - 2018
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201700681
Subject(s) - materials science , oxazoline , copolymer , composite material , dielectric strength , polymer chemistry , dielectric , polymer , organic chemistry , chemistry , catalysis , optoelectronics
Copoly(2‐nonyl‐2‐oxazoline)‐ stat ‐poly(2‐dec‐9′enyl‐2‐oxazoline)s can be crosslinked by the thiol‐ene reaction with glycol dimercaptoacetate. The copoly(2‐oxazoline)‐ stat ‐copolyester is tested as dielectric for high‐voltage applications, either as unfilled resin or as composite with nanoscaled fillers of silica, alumina, and hexagonal boron nitride. During AC voltage tests, all materials have an average breakdown strength of 45–50 kV mm −1 . For DC voltage tests, samples with SiO 2 (hBN) have an average breakdown strength of ≈100 (80) kV mm −1 , while the unfilled copoly(2‐oxazoline) has an average breakdown strength of ≈60 kV mm −1 . Permittivity measurements at 20 °C and 50 Hz reveal that all nanocomposites are dielectrics ( D = 0.06–0.08), while the unfilled copoly(2‐oxazoline)s has a high loss factor of D = 8.43. This phenomenon can be retraced to the phase separation in the crosslinked copolymer, the M‐OH functionality of silica and alumina particles, and models of polymer–particle interactions such as the Tanaka model, revealing that the nanofillers reduce the interfacial and dipolar polarizability.