Abstract: The results of an investigation of the broadband dielectric properties of onion-like carbon (OLC)/polyurethane (PU) composites over a wide temperature range (300–450 K) are presented. The onset of the percolation threshold reached at 10 vol% of OLC is accompanied by drastically increased microwave absorption. The broadband dielectric properties of the composites at low loading of OLC, below the percolation threshold, are mainly governed by the α relaxation, the dynamics of the “soft” molecular segment of the PU chain. With increased OLC concentration, the glass-transition temperature decreases and the α relaxation completely vanishes for the composite with 5 vol% OLC. As the α relaxation vanishes rapid enhancement of the mobility of the soft molecular segments in PU chains occurs and a decrease of the activation energy of electrical conductivity follows.Keywords: composites; dielectric properties; onion-like carbon

Cite: Macutkevic J. , Banys J. , Kuznetsov V. , Moseenkov S. , Shenderova O.
Broadband Dielectric Properties of Onion-Like Carbon/Polyurethane Composites
Physica Status Solidi (A) Applications and Materials (after 2004). 2013. V.210. N12. P.2683-2688. DOI: 10.1002/pssa.201330257 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	Aug 28, 2013
Accepted:	Sep 11, 2013
Published online:	Oct 4, 2013
Published print:	Dec 1, 2013

Identifiers:

Web of science:	WOS:000328452500024
Scopus:	2-s2.0-84890432466
Elibrary:	21466465
Chemical Abstracts:	2013:1608009
Chemical Abstracts (print):	160:496280
OpenAlex:	W1585319542

Citing:

DB	Citing
Web of science	6
Scopus	6
Elibrary	6
OpenAlex	6

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