Lamellar styrene-diene diblock copolymers

In lamellar styrene-diene diblock copolymers, SANS studies showed that the segment Rg contracts to 70% of the unperturbed value parallel to the interface and expands to 160% of the unperturbed value perpendicular to the interface (Hasegawa et al 1985, 1987). These values were found for both the styrene and diene blocks. A smdy of stretching SIS block copolymers having spherical styrene phases showed that the deformation in the direction of stretch was greater than affine, while the deformation perpendicular to the stretch was much less (Richards and Welsh, 1995). 

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