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Polymers 2016, 8(1), 6;

Crosslinked Poly(2-oxazoline)s as “Green” Materials for Electronic Applications

Polymer Competence Center Leoben, Rosseggerstrasse 12, Leoben 8700, Austria
Institute for Chemistry and Technology of Materials, Graz University of Technology, NAWI Graz, Stremayrgasse 9, Graz 8010, Austria
Department of Electrical Sustainable Energy, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands
Asea Brown Boveri (ABB) Corporate Research, Segelhofstrasse 1k, 5405 Baden-Daettwil, Switzerland
Authors to whom correspondence should be addressed.
Academic Editor: Do-Hoon Hwang
Received: 1 December 2015 / Revised: 22 December 2015 / Accepted: 24 December 2015 / Published: 30 December 2015
(This article belongs to the Special Issue Nano- and Microcomposites for Electrical Engineering Applications)
Full-Text   |   PDF [1802 KB, uploaded 30 December 2015]   |  


Poly(2-nonyl-2-oxazoline)80-stat-poly(2-dec-9′-enyl-2-oxazoline)20 and poly(2-dec-9′-enyl-2-oxazoline)100 can be synthesized from the cationic ring-opening polymerization of monomers that can be derived from fatty acids from renewable resources. These (co)poly(2-oxazoline)s can be crosslinked with di- and trifunctional mercapto compounds using the UV-induced thiol-ene reaction. The complex permittivity of the corresponding networks increases with the temperature and decreases with the network density. In a frequency range from 10−2 to 106 Hz and at temperatures ranging from −20 to 40 °C, the changes of the real part of the complex permittivity as well as the loss factor can be explained by interfacial polarization within the material. At a temperature of 20 °C and a frequency of 50 Hz, the permittivity of the crosslinked (co)poly(2-oxazoline)s covers a range from 4.29 to 4.97, and the loss factors are in the range from 0.030 to 0.093. The electrical conductivities of these polymer networks span a range from 5 × 10−12 to 8 × 10−9 S/m, classifying these materials as medium insulators. Notably, the values for the permittivity, loss factor and conductivity of these copoly(2-oxazoline)s are in the same range as for polyamides, and, hence, these copoly(2-oxazoline)-based networks may be referred to as “green” alternatives for polyamides as insulators in electronic applications. View Full-Text
Keywords: poly(2-oxazoline)s; crosslinked polymers; thiol-ene click chemistry; permittivity; loss factor; interfacial polarization; electrical conductivity poly(2-oxazoline)s; crosslinked polymers; thiol-ene click chemistry; permittivity; loss factor; interfacial polarization; electrical conductivity

Figure 1

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Fimberger, M.; Tsekmes, I.-A.; Kochetov, R.; Smit, J.J.; Wiesbrock, F. Crosslinked Poly(2-oxazoline)s as “Green” Materials for Electronic Applications. Polymers 2016, 8, 6.

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