Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00095 : Effect of Single-Walled Carbon Nanotubes on Glass Transition Behavior in Polystyrene
Author:
Our group previously investigated (Macromolecules, 2009, 42,
6152) the effect of nanotube addition on the glass transition
temperature (Tg) and the heat capacity change at the glass
transition (Delta Cp). Tg increased with nanotube addition by
$\sim $7\r{ }C at 1 wt{\%} added nanotubes, while the
delta Cp had the same qualitative behavior, but with a $\sim
$20{\%} decrease instead of an increase. We have extended this
work to polymer grafted-to nanotubes, with polystyrene molecular
weights of 2800, 15,000 and 50,000 g/mol; the weight fractions of
grafted chains were approximately the same. For the two higher
grafting densities, Tg showed the same qualitative
behavior but quantitatively the increase in Tg was closer to
9\r{ }C. Composites with 50 K grafted nanotubes were
statistically identical in terms of the Tg and Delta Cp, although
the latter at high nanotube concentrations
(20 wt{\%}) did show some anomalous behavior. The decrease in
Delta Cp for composites made with the nanotubes having the
highest grafting density was linear with added grafted nanotubes
to a maximum of a $\sim $35{\%} decrease. Delta Cp for the
materials made with 15 K grafted nanotubes showed either a small
decrease, or no change in Delta Cp.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.95
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