We use a combination of computational and experimental studies to elucidate the effect of polymer stereoregularity on the capability of polystyrene interacting with single-walled carbon nanotube (SWNT) surfaces. Calculated binding energies on complexes of lightly oxidized SWNT with isotactic and atactic polystyrene favor the former, which suggests that the isotactic polymer interacts more effectively with the SWNT. The glass transition temperature (T g ) of the isotactic polystyrene/SWNT matrix increases from 90.9 to 100.5 o C as the SWNT content is increased to 0.5%, whereas the glass transition temperature of the atactic polystyrene/SWNT matrix is invariant with increasing SWNT content. Rotating frame 13 C T 1ρ relaxation rates for the isotactic polymer/SWNT matrix increases from 2.15 to 2.43 ms as SWNT is increased from 0.25 to 1.0 %. However, the rotating frame 13 C T 1ρ relaxation rates for the atactic polymer/SWNT matrix decreases from 2.50 to 1.60 ms as SWNT is increased from 0.25 to 1.0 %. Our results demonstrate that the SWNT is better dispersed within the isotactic polystyrene and the better dispersion is associated with more effective interaction of isotactic polymer with the SWNT surface.
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