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A series of amphiphilic LC block copolymers, in which the hydrophobic blockis a smectic polymer poly(4-methoxyphenyl 4-(6-acryloyloxy-hexyloxy)-benzoate)(PA6ester1) and the hydrophilic block is polyethyleneglycol (PEG), weresynthesized and characterized. The self-assembly of one of them in both thepure state and the dilute aqueous solution was investigated in detail.Nano-structures in the pure state were studied by SAXS and WAXS on samplesaligned by a magnetic field. A hexagonal cylindrical micro-segregation phasewas observed with a lattice distance of 11.2 nm. The PEG blocks are in thecylinder, while the smectic polymer blocks form a matrix with layer spacing 2.4nm and layer normal parallel to the long axis of the cylinders. Facetedunilamellar polymer vesicles, polymersomes, were formed in water, as revealedby cryo-TEM. In the lyotropic bilayer membrane of these polymersomes, thethermotropic smectic order in the hydrophobic block is clearly visible withlayer normal parallel to the membrane surface.

Self-assembly of liquid crystal block copolymer PEG-b-smectic polymer in pure state and in dilute aqueous solution