Finally, a comment must be made regarding the
effect of block copolymer architecture on the properties
of binary block copolymer/polystyrene blends.
There are experimental results which suggest that
block copolymer architecture (neat vs. tapered, linear
vs. star shaped, symmetric vs. asymmetric, etc.) can
directly influence the phase behavior of the blends with
corresponding homopolymer. Consequently, diversity
in the mechanical properties depending on the block
copolymer architecture is observed. For instance, a
typical ‘droplet-like’ morphology was found in blends
of polystyrene with an asymmetric SBS star block
copolymer, in contrast to the predominantly layered
morphology with a linear triblock copolymer having
an analogous composition [75].