Enhancing dielectric breakdown strength: structural relaxation of amorphous polymers and nanocomposites. (22nd May 2015)

• Record Type: Journal Article
• Authors: Grabowski, Christopher A.; Koerner, Hilmar; Vaia, Richard A.
• Is Part Of: MRS communications. Volume 5:Number 2(2015:Jun.)
• Page Start: 205
• Page End: 210
• Publication Date: 2015-05-22
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1557/mrc.2015.29
• Languages: English
• ISSNs: 2159-6859

Abstract

Abstract: 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 T g −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.