Abstract
The applicability of forced Rayleigh scattering (FRS) as a means of a direct determination of possible diffusional anisotropies on the block copolymer systems with lamellar morphology is discussed. A first result is reported which directly indicates the anisotropy of diffusion in this system. For this purpose the diffusion measurements were conducted on a bulk poly(styrene-block-isoprene) copolymer (M n =2.12×10 4 ) in the ordered state and in directions parallel and perpendicular to the surface of an oriented film at temperatures higher than the T g of polystyrene microdomains
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