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By Antonietti M.

ISBN-10: 3540004157

ISBN-13: 9783540004158

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Binary phase diagram of poly(butadiene-b-ethylene oxide) (PB202-PEO360 ) product can be predicted a priori: As the nanocast, an ordered hybrid material consisting of silica and the templating block copolymer, is the result of adding a component to a binary lyotropic liquid crystal phase without ultimately changing the phase structure. This method is equally applicable for nonionic [26, 31, 32] as for ionic [33] amphiphilic block copolymers, which is another strong indicator that supramolecular templating of the lyotropic mesophase governs the mechanism of nanocasting.

Göltner-Spickermann Fig. 2. Optical textures of a hexagonal siliceous LLC phase comprising the surfactant C12EO8 . e. of the still liquid phase, the bottom picture after polycondensation was complete. The crack is a consequence of shrinkage which is still applied for the manufacturing of bronze statues and church bells. Nanocasting is the method, which produces an exact cast of the lyotropic block copolymer or surfactant phase structure. The structure of the materials obtained by nanocasting is similar to that of M41S-type mesoporous molecular sieves (see Fig.

As a consequence, the whole phase diagram of this bulk block copolymer with respect to block length ratio can therefore be traversed without having to synthesize amphiphilic block copolymers with different block length ratios. Depending on the amount of inorganic sol present in the block copolymer, a whole variety of differently structured hybrid materials can be produced (see Fig. 10). Fig. 10. Hybrid structures from one single block copolymer (from [43]) 43 Nanocasting of Lyotropic Liquid Crystal Phases for Metals and Ceramics NMR spectroscopic analysis finally proved that the poly(ethylene oxide) blocks are firmly anchored in the inorganic phase rather than being located at the interphase adjacent to the hydrophobic domains.

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Colloid Chemistry I by Antonietti M.

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