TEM micrograph of: (a) individual MWCNTs and (b) CB particles.
TEM images of ultracryomicrotomed samples of (a) CB-SBR for and (b) CNT-SBR for .
Storage modulus as a function of the filler volume fraction. The symbols used in this figure are: (○) CB and (◻) CNT. Room temperature. The curve is a fit to the Einstein equation, with .
Dc conductivity of CB-(top) and CNT-(bottom) polymer samples plotted against . Room temperature. From these graphs, the conduction transition volume fraction is estimated to be for the CB-SBR samples and for the, respectively, CNT-SBR samples. More data points are necessary to determine the onset conductivity accurately.
(a) Frequency dependence of the real part of the effective complex (relative) permittivity of SBR/CB composites for several filler volume fractions . The numbers in the inset are the filler volume fractions. Room temperature. (b) Same as in (a) for SBR/CNT composites.
Comparison of measurements of the real part of the effective complex (relative) permittivity of the SBR/CB and SBR/CNT composites as a function of the filler volume fraction with the Bruggeman (solid line) and MG (dashed line) equations. The inset shows the low-volume fraction region of the figure (indicated by the arrow).
(a) The real part of the effective complex (relative) permittivity of SBR/CB composites as a function of the extension ratio for two filler volume fractions (indicated by the arrows). Room temperature. The numbers in the inset are the elongation ratios. (b) Same as in (a) for two SBR/CNT samples (c) Dependence of the thickness change (triangles), width change (squares) and length (circles) change in the SBR/CB composite (nominal CB volume fraction of ) normalized to the corresponding initial value, as a function of the extension ratio . The solid and dashed curves represent the and functions, respectively. (d) Same as in (c) for the SBR/CNT sample (nominal CNT volume fraction of ).
(a) Frequency dependence of the effective complex (relative) permittivity of the SBR/CB sample containing CB for two values of the extension ratio . (b) The relative difference of the real part of the complex (relative) permittivity as a function of the extension ratio . . The lines represent the function with different values of the constant . (c) Same as in (b) for the relative difference of the imaginary part .
The specifications of the filler materials examined in the current study from manufacturer product literature. Brunauer–Emmett–Teller (BET).
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