TY - JOUR
T1 - Enhancement of the Insulation Properties of Poly(2-oxazoline)-co-Polyester Networks by the Addition of Nanofillers
AU - Eibel, Alexander
AU - Marx, Philipp
AU - Jin, Huifei
AU - Tsekmes, Alex
AU - Mühlbacher, Inge
AU - Smit, Johan
AU - Kern, Wolfgang
AU - Wiesbrock, Frank
PY - 2018
Y1 - 2018
N2 - 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 SiO2 (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.
AB - 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 SiO2 (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.
KW - dielectric
KW - nanocomposites
KW - permittivity
KW - poly(2-oxazoline)
KW - thiol-ene reaction
UR - http://www.scopus.com/inward/record.url?scp=85039789523&partnerID=8YFLogxK
U2 - 10.1002/marc.201700681
DO - 10.1002/marc.201700681
M3 - Article
AN - SCOPUS:85039789523
SN - 1022-1336
VL - 39
SP - 1
EP - 6
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
IS - 6
M1 - 1700681
ER -