Segregated Networks of Carbon Black in Poly(vinyl acetate) Latex: Influence of Clay on the Electrical and Mechanical Behavior
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Films were prepared from mixtures of PVAc latex, CB, and natural sodium montmorillonite clay. In the absence of clay, these composites exhibit a percolation threshold of 1.2 vol.-% CB, which is nearly an order of magnitude lower than that observed for composites prepared using PVAc solution. SEM images reveal a segregated CB network that is the result of excluded volume created by the much larger polymer particles in the latex. With the addition of 0.2 wt.-% clay, the percolation threshold is reduced to 0.9 vol.-% carbon black due to clay-induced networking. The storage modulus is also enhanced by the presence of clay, although higher clay concentration appears to adversely affect electrical and mechanical behavior of these composites. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.
author list (cited authors)
Miriyala, S. M., Kim, Y. S., Liu, L., & Grunlan, J. C.