Structures silicone amphiphilic copolymers

Perrier RJ (2001) Direct Conversion of 5,6-Unsaturated Hexopyranosyl Compounds to Functionalized Glycohexanones. 215 277-291 Frey H, Schlenk C (2000) Silicon-Based Dendrimers. 210 69-129 Forster S (2003) Amphiphilic Block Copolymers for Templating Applications. 226 1-28 Frullano L, Rohovec J, Peters JA, Geraldes CFGC (2002) Structures of MRI Contrast Agents in Solution. 221 25-60... 

Janus micelles are non-centrosymmetric, surface-compartmentalized nanoparticles, in which a cross-linked core is surrounded by two different corona hemispheres. Their intrinsic amphiphilicity leads to the collapse of one hemisphere in a selective solvent, followed by self-assembly into higher ordered superstructures. Recently, the synthesis of such structures was achieved by crosslinking of the center block of ABC triblock copolymers in the bulk state, using a morphology where the B block forms spheres between lamellae of the A and C blocks [95, 96]. In solution, Janus micelles with polystyrene (PS) and poly(methyl methacrylate) (PMMA) half-coronas around a crosslinked polybutadiene (PB) core aggregate to larger entities with a sharp size distribution, which can be considered as supermicelles (Fig. 20). They coexist with single Janus micelles (unimers) both in THF solution and on silicon and water surfaces [95, 97]. 

Polyrn rS. Polymeric monolayers are formed either by spreading preformed polymers or by polymerizing reactive monomers on the water surface. A large variety of preformed polymers has been studied, including polyacrylates and polymethacrylates, poly(vinyl butyral), poly(vinyl methyl ether), poly(vinyl acetate), poly(vinyl fiuoride), poly(vinylidene fluoride), (12), silicone copolymers, maleic anhydride copolymers, and polypeptides (1). Monomers that have been successfully polymerized at the air-water interface include derivatives of aniline (13), vinyl alcohol (14), and styrene (15). In addition to the interesting chemistry and the two-dimensional structural control, polymer LB Aims are much more robust than films formed from straight-chain amphiphiles. 

Hoefling et al. investigated the relationship between structure and solubility of silicone-based amphiphiles in CO2 (28). Here a silicone copolymer... 

Figure 17 (a) The chemical structure of the amphiphilic liquid crystalline diblock copolymer, p(E0)n4-/)-p(MAAZ)47, which consists of a hydrophilic polyethylene oxide block and a hydrophobic polymethacrylate block with an azobenzene moiety in its side group, (b) 2D GIWAXS and GISAXS patterns obtained at ai= 0.16 ° during heating of the p(EO)-f>-p(MAAZ) thin film with a thickness of 700 nm deposited on a silicon substrate. ... 

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