Characterization of the Interfacial Surface Energy for Composite Electrical Conduction Measurements using Two Full Range Percolation Threshold Models

Richard D. Sudduth*

Materials Research and Processing, LLC, 3718 Dunlin Shore Court, Peachtree Corners, GA 30092

Adv. Mater. Lett., 2020, 11 (3), 20031484 (1-12)

DOI: 10.5185/amlett.2020.031484

Publication Date (Web): Feb 26, 2020

E-Mail: RichSudduth@Earthlink.Net


Two full concentration range percolation threshold models were evaluated for three different carbon fillers in both Nylon 6,6 and Lexan.  A new Modified Landauer Model was introduced in this study and compared with a Percolation Threshold Model recently published by this author. These models were then utilized to address how to best characterize the interfacial surface energy, gpf, for composite electrical conduction measurements using Clingerman’s data. Three different models used for calculating the interfacial surface energies, gpf, were evaluated in this study. It was found that solid measurements used in calculating the Fowkes equation for the interfacial surface energy gave the most consistent correlations. A linear correlation was found between the Fowkes Interfacial surface energy and the b constant designated as the insulation surface interaction magnitude from the new Percolation Threshold Model. In addition, three concurrent mathematical conditions were found to occur at the same concentration for both the new percolation threshold models yielding S-shaped curves in this study.  These conditions include the concentration at the Inflection Point, the concentration at the maximum slope and the maximum extrapolated percolation threshold concentration calculated at the same concentration.


Electrical conductivity, carbon black, nylon 6,6, lexan, carbon filled composite, percolation threshold.

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