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1

Polymer Competence Center Leoben, Rosseggerstrasse 12, Leoben 8700, Austria

2

Institute for Chemistry and Technology of Materials, Graz University of Technology, NAWI Graz, Stremayrgasse 9, Graz 8010, Austria

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Department of Electrical Sustainable Energy, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands

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Asea Brown Boveri ABB Corporate Research, Segelhofstrasse 1k, 5405 Baden-Daettwil, Switzerland





*

Authors to whom correspondence should be addressed.



Academic Editor: Do-Hoon Hwang

Abstract Poly2-nonyl-2-oxazoline80-stat-poly2-dec-9′-enyl-2-oxazoline20 and poly2-dec-9′-enyl-2-oxazoline100 can be synthesized from the cationic ring-opening polymerization of monomers that can be derived from fatty acids from renewable resources. These copoly2-oxazolines 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 copoly2-oxazolines 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 copoly2-oxazolines are in the same range as for polyamides, and, hence, these copoly2-oxazoline-based networks may be referred to as -green- alternatives for polyamides as insulators in electronic applications. View Full-Text

Keywords: poly2-oxazolines; crosslinked polymers; thiol-ene click chemistry; permittivity; loss factor; interfacial polarization; electrical conductivity poly2-oxazolines; crosslinked polymers; thiol-ene click chemistry; permittivity; loss factor; interfacial polarization; electrical conductivity





Autor: Martin Fimberger 1,2, Ioannis-Alexandros Tsekmes 3, Roman Kochetov 3,4, Johan J. Smit 3,* and Frank Wiesbrock 1,*

Fuente: http://mdpi.com/



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