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62 Răzvan Florin Barzic et al.
3- ω method, as being 830 W/m K (Choi & Poulikakos, 2005), the λ of the
nanocomposites was estimated from
λnanocomposite = λPS wPS + λCNT wCNT
. (2)
where wPS is the volume fraction of PS and wCNT
is the volume fraction of
CNT.
For a percent of 5% CNT in the PS matrix the thermal conductivity is
increased up to 41.49 W/m K. The obtained results indicate that the studied
nanocomposites could exhibit high heat transfer – suitable for protecting chips
of overheating in power electronics.
polystyrene (PS)
Double-walled carbon
nanotubes
The orientation of the
polymer matrix
by shearing
PS /CNT nanocomposite
Orientation of carbon
nanotubes in the PS matrix by
shearing
Fig. 1 – Scheme for preparation of nanocomposites PS/carbon nanotubes orientated by
shear.
Fig. 2 – AFM image of PS film obtained from a sheared solution in methylene chloride.