These results reveal that
the PET/NR blends exhibited a skin-core morphology similar
to those seen in other rubber modified PET system such as
PET/SEBS [10,22], PBT-Ph/mPEO [23] or PBT/PEO [24].
The holes near the edge of the sample containing the NR domains
are elongated NR of predominantly rod-shapes as shown
in Fig. 3a. A few holes were oval, suggesting that some of the
elongated NR domains were slightly flattened just as seen in
PET/SEBS-g-MA blend [10,22] and PBT/PEO blend [25].