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Issue 14, 2015
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High electron affinity: a guiding criterion for voltage stabilizer design

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Voltage stabilizers are an emerging class of additives that enhance the dielectric strength of an insulating polymer such as polyethylene. Several partially conflicting reports ascribe the stabilizing effect to either a high electron affinity or low ionization potential of the additive. Here, we report a clear correlation of the electron affinity and to a lesser extent the EHOMOELUMO difference of various voltage stabilizers with electrical tree initiation in cross-linked polyethylene. To facilitate a fair evaluation, the voltage-stabilizing efficiency of a set of 13 previously reported voltage stabilizers, which strongly differ in their chemical composition, is compared at equal stabilizer concentration and equivalent test methodology. These results are correlated with the electron affinity and EHOMOELUMO difference, as obtained from density functional theory (DFT) modeling, which agreed well with available literature values. Moreover, based on the here established strong correlation between dielectric strength and electron affinity, a new molecule with exceptionally high electron affinity is selected from the extended literature on organic photovoltaics. This malononitrile–benzothiadiazole–triarylamine based molecule with a high electron affinity of 3.4 eV gives rise to a 148% increase in tree initiation field compared to 40% obtained using anthracene, one of the most efficient previously reported voltage-stabilizers, under equivalent test conditions. Thus, we here propose to use the electron affinity as a guiding criterion for identifying novel high-efficiency voltage stabilizers, which opens up the vast library of organic semiconductors as potential candidates, as well as associated synthesis routines for the design of yet unexplored materials.

Graphical abstract: High electron affinity: a guiding criterion for voltage stabilizer design

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Publication details

The article was received on 19 Sep 2014, accepted on 05 Feb 2015 and first published on 27 Feb 2015

Article type: Paper
DOI: 10.1039/C4TA04956J
J. Mater. Chem. A, 2015,3, 7273-7286
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    High electron affinity: a guiding criterion for voltage stabilizer design

    M. Jarvid, A. Johansson, V. Englund, A. Lundin, S. Gubanski, C. Müller and M. R. Andersson, J. Mater. Chem. A, 2015, 3, 7273
    DOI: 10.1039/C4TA04956J

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