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Enhancing dielectric breakdown strength: structural relaxation of amorphous polymers and nanocomposites

Part of: Polymers and Soft Matter

Published online by Cambridge University Press:  22 May 2015

Christopher A. Grabowski ,
Hilmar Koerner  and
Richard A. Vaia
Christopher A. Grabowski
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Ohio 45433; UES, Inc., Dayton, Ohio 45432, USA
Hilmar Koerner
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Ohio 45433, USA
Richard A. Vaia*
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Ohio 45433, USA
*
Address all correspondence to Richard A. Vaia at[email protected]
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Abstract

The thermal history of amorphous polymers near the glass-transition temperature determines the extent to which macromolecules structurally relax, and ultimately their properties. Here, we report the correlation between physical aging, dielectric breakdown, and capacitive energy storage of polystyrene, poly(methyl-methacrylate), and associated silica nanocomposites. Guided by enthalphic recovery rates, dielectric breakdown strength increased from 20% to 40% when aged at Tg−10 °C before use. The generality of improvement and connection to enthalpic recovery afford a means to design pre-service processing of new polymers and additive manufacturing techniques to reduce excess volume within the glass; and thereby reduce initiation and inhibit propagation of electronic failure.

Type
Polymers/Soft Matter Research Letters
Information
MRS Communications , Volume 5 , Issue 2 , June 2015 , pp. 205 - 210
Copyright
Copyright © Materials Research Society 2015 

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