Thermal and mechanical behavior of single-walled carbon nanotube-filled latex films

Composite films were prepared from a mixture of poly(vinyl acetate) latex and SWNTs. SEM images reveal a segregated SWNT network that grows heavier with increasing concentration. Nanotube segregation is the result of excluded volume created by the much larger polymer particles in the latex. Thermal conductivity exhibits a sharp rise with increasing quantity of nanotubes, although the maximum value is only 10% greater than that of the polymer matrix due to large thermal interface resistance. Storage modulus exhibits a peak and subsequent drop due to pore formation. In the absence of porosity, the Halpin-Tsai model accurately predicts the composite modulus at 25 °C. The segregated network improves the composite modulus above Tg by nearly an order of magnitude with only 2 wt.-% SWNT.

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Grunlan, JC; Kim, YS; Ziaee, S; Wei, X; Abdel-Magid, B; Tao, K; Macromol. Mater. Eng., 2006, 291, 1035-1043. *This article was featured as a cover article.
Published in Macromolecular Materials and Engineering 2006