Abstract
Lyotropic phase morphologies of amphiphilic poly(butadiene-b-ethylene oxide) (PB−PEO) block copolymers are studied using transmission electron microscopy, small-angle X-ray scattering, small-angle neutron scattering, and polarized optical microscopy. The PB−PEO block copolymers form type-1 lyotropic phases comprising disordered micellar solutions (L1), spheres arranged on a bcc lattice (I1), hexagonally packed cylinders (H1), and lamellae (Lα). Increasing molecular weight destabilizes the I1 and H1 phases and lowers the degree of order. For high molecular weight block copolymers the increase in chain conformational entropy leads to the formation of the sponge phase (L3). The transmission electron micrographs allow a detailed analysis of packing defects and epitaxial relations of the block copolymer lyotropic phases.
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