Free volume in nanodielectrics

J. Keith Nelson; Yanhui Huang; Timothy M. Krentz; Linda S. Schadler; Jerzy Dryzek; Brian C. Benicewicz; Michael Bell

doi:10.1109/ICPADM.2015.7295203

Free volume in nanodielectrics

J. Keith Nelson, Yanhui Huang, Timothy M. Krentz, Linda S. Schadler, Jerzy Dryzek, Brian C. Benicewicz, Michael Bell

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

10 Scopus citations

Abstract

It is now well established that the incorporation of nanoparticulates into a polymer matrix to form a nanodielectric can bring about useful improvements in electric strength provided that the processing results in acceptable particle dispersion. One of the theories of electrical breakdown in polymers seeks to associate breakdown with the polymer free volume, and the well-documented substantial changes in electric strength occurring at glass transition provide some credence to that theory. While it is clear that interactions at the large internal interfacial area in a nanodielectric facilitate the augmentation of dielectric strength, the exact mechanism has not been clarified. Very early work using a compression methodology to estimate free volume in an epoxy nanodielectric indicated that the particles did little to affect free volume. However, this contribution seeks to use positron annihilation lifetime spectroscopy to estimate free volume in an epoxy and several of its SiO2-based nanocomposites to estimate the changes in free volume brought about both through the incorporation of nanoparticulates and also through their functionalization. This study broadly confirms the earlier work and provides good evidence that the free volume is little affected, and thus is not an explanation for the observed change in dielectric strength.

Original language	English (US)
Title of host publication	ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	40-43
Number of pages	4
Volume	2015-October
ISBN (Electronic)	9781479989034
DOIs	https://doi.org/10.1109/ICPADM.2015.7295203
State	Published - Oct 8 2015
Externally published	Yes
Event	11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 - Sydney, Australia Duration: Jul 19 2015 → Jul 22 2015

Other

Other	11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
Country/Territory	Australia
City	Sydney
Period	7/19/15 → 7/22/15

Keywords

electric strength
free volume
Nanodielectrics
polymer composite

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1109/ICPADM.2015.7295203

Cite this

Nelson, J. K., Huang, Y., Krentz, T. M., Schadler, L. S., Dryzek, J., Benicewicz, B. C., & Bell, M. (2015). Free volume in nanodielectrics. In ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (Vol. 2015-October, pp. 40-43). [7295203] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPADM.2015.7295203

Free volume in nanodielectrics. / Nelson, J. Keith; Huang, Yanhui; Krentz, Timothy M. et al.
ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials. Vol. 2015-October Institute of Electrical and Electronics Engineers Inc., 2015. p. 40-43 7295203.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Nelson, JK, Huang, Y, Krentz, TM, Schadler, LS, Dryzek, J, Benicewicz, BC & Bell, M 2015, Free volume in nanodielectrics. in ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials. vol. 2015-October, 7295203, Institute of Electrical and Electronics Engineers Inc., pp. 40-43, 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015, Sydney, Australia, 7/19/15. https://doi.org/10.1109/ICPADM.2015.7295203

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AB - It is now well established that the incorporation of nanoparticulates into a polymer matrix to form a nanodielectric can bring about useful improvements in electric strength provided that the processing results in acceptable particle dispersion. One of the theories of electrical breakdown in polymers seeks to associate breakdown with the polymer free volume, and the well-documented substantial changes in electric strength occurring at glass transition provide some credence to that theory. While it is clear that interactions at the large internal interfacial area in a nanodielectric facilitate the augmentation of dielectric strength, the exact mechanism has not been clarified. Very early work using a compression methodology to estimate free volume in an epoxy nanodielectric indicated that the particles did little to affect free volume. However, this contribution seeks to use positron annihilation lifetime spectroscopy to estimate free volume in an epoxy and several of its SiO2-based nanocomposites to estimate the changes in free volume brought about both through the incorporation of nanoparticulates and also through their functionalization. This study broadly confirms the earlier work and provides good evidence that the free volume is little affected, and thus is not an explanation for the observed change in dielectric strength.

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Free volume in nanodielectrics

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