| Abstract: | The lamellar structure of a two-block polystyrene/polyisoprene copolymer was studied by small angle X-ray diffraction as a function of the solvent content of the samples. The analysis of the intensity of the diffraction lines has permitted the evaluation of the distribution coefficient of the solvent between the microdomains of segregation. The change of the structural parameters as a function of the affinity of each solvent with respect to both blocks was studied. It was shown that the swelling of the lamellar structure proceeds parallel to the interfaces of the lamellae when the solvent used does not preferentially dissolve one of the blocks, whereas it corresponds to an increase of the thickness of the lamellae if preferential solution of one of the blocks by the solvent takes place. |
