Abstract
AbstractFor styrene‐isoprene blockcopolymers of lamellar morphology obtained by casting from solution the influence of various modifications of thermodynamic interactions on lamellar dimensions and longperiods is studied by electron microscopy. The thermodynamic interactions are modified by the generation of a broad interphase caused by the insertion of a poly(isoprene‐co‐styrene)copolymer block of random structure between the pure blocks and by use of a preferential solvent of the diene component in blockcopolymers containing 20 wt‐% isoprene leading to a highly ordered asymmetrical lamellar morphology. Both modifications lead to a compression of the lamellar domains and longperiods relative to the dimensions of symmetrical unmodified systems. The influence of the interblock content is described by the same functional dependence for both symmetrical and asymmetrical systems.
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