The synthesis of non linear block copolymers of the type (BA)(2)B (3-m
iktoarm star copolymer), (BA)(3)B (4-miktoarm star copolymer), (BA)(3)
B(AB)(3) (super H-shaped), B(2)AB(2) (H-shaped) and (B,A)A(B,A) (pi-sh
aped), where A is polyisoprene 1,4 and B is polystyrene was performed
using anionic polymerization techniques and suitable chlorosilane chem
istry. Characterization data showed that the samples are molecularly a
nd compositionally homogeneous. TEM, SAXS and SANS were used to study
the microphase behavior of the copolymers. For all samples, the result
s were analyzed in the frame of the theoretical predictions given by M
ilner and taking into account the results from previous studies on the
A(2)B and A(3)B miktoarm star copolymers.