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Structured Polyethylene Nanocomposites: Effects of Crystal Orientation and Nanofiller Alignment on High Field Dielectric Properties

Published online by Cambridge University Press:  20 December 2016

Bo Li ,
C. I. Camilli ,
P. I. Xidas ,
K. S. Triantafyllidis  and
E. Manias
Bo Li
Affiliation:
Materials Science and Engineering, Penn State University, University Park, PA 16802, U.S.A
C. I. Camilli
Affiliation:
Materials Science and Engineering, Penn State University, University Park, PA 16802, U.S.A
P. I. Xidas
Affiliation:
Materials Science and Engineering, Penn State University, University Park, PA 16802, U.S.A Chemistry Department, Aristotle University of Thessaloniki, GR54006 Thessaloniki, GREECE
K. S. Triantafyllidis
Affiliation:
Chemistry Department, Aristotle University of Thessaloniki, GR54006 Thessaloniki, GREECE
E. Manias*
Affiliation:
Materials Science and Engineering, Penn State University, University Park, PA 16802, U.S.A
*
*address correspondence to manias@psu.edu;
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Abstract

In previous work we have shown that aligned high aspect-ratio (pseudo-2D) nanofillers can yield large dielectric breakdown strength (EBD) improvements for a nanocomposite with a low-crystallinity polyethylene matrix. Here, we report a systematic study which delineates the contributions of the aligned inorganic fillers and of the aligned polymer crystallites in the overall EBD improvement achieved in the nanocomposites. Specifically, extrusion blown-molded polyethylene/montmorillonite nanocomposite films were cold-stretched to various strains, to further align the nanoparticles parallel to the film surface; this filler alignment is accompanied by a commensurate alignment of the polymer crystallites, especially those heterogeneously nucleated by the fillers. A systematic series of films are studied, with increased extent of alignment of the fillers and of the crystalline lamellae (quantified through Hermans orientation order parameters from 2D X-ray diffraction studies) and the aligned structure is correlated to the electric field breakdown strength (quantified through Weibull failure studies). It is shown that aligned pseudo-2D inorganic nanofillers provide additional strong improvements in EBD, improvements that are beyond, and added in excess of, any EBD increases due to polymer-crystal orientation.

Keywords

dielectric propertiesmorphologycomposite
Type
Articles
Information
MRS Advances , Volume 2 , Issue 6: Biomaterials and Soft Materials , 2017 , pp. 363 - 368
Copyright
Copyright © Materials Research Society 2016 

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Footnotes

†

undergraduate student.

References

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