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We have studied by small angle X-ray scattering and electron microscopy the liquid crystalline structures exhibited by polystyrene-polybutadiene block copolymers. For that purpose we have developed an original method of electron microscopy. The types of structure (lamellar and hexagonal) and the values of the structural parameters found by X-ray diffraction and by electron microscopy are in good agreement. Induced by this good agreement we have applied our method of electron microscopy to the study of solutions of copolymers at all concentrations and we may picture a way of formation for liquid-crystalline structures exhibited by block copolymers.
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Douy et al. (1971) studied this question.
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