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epresent the mass fraction of MWNTs, and the ‘S’ stands for solution
blending, ‘M’ for melt mixing, and ‘SM’ for the SOAM method.
2. 3. Foaming of nanocomposites
Nanocomposite films fabricated by solution blending and having a
uniform size (25 mm width × 50 mm long) were put into a Haake
rheometer and mixed into a molten state at 120 o C for 10 min with a
screw speed of 60 rpm. Afterwards, ACP-4 with different contents was
slowly added to the mixer and blended for a further 10 min. The
resulting products were prepared by compression molding at 135 o C
for 8 min into strips of 12 mm × 60 mm × 3 mm. Each strip was
again cut into samples of 12 mm × 20 mm, followed by foaming at
150, 160, and 170 o C for 5, 10, 20, and 30 min in a forced convection
oven, respectively.
2. 4. Characterization of nanocomposites and their foams
FT-Raman spectra were acquired to evaluate the formation of MWNT-
reinforced PBS nanocomposites using a RFS 100/S (Bruker,
Germany) with a spectral resolution of 4 cm -1 . The excitation length
was the 1064 nm line of a 60 mW Nd-YAG laser. The cryo-fractured
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