Hybrid block copolymers

This review discusses the sohd-state structure, organization and properties of peptide-synthetic hybrid block copolymers. Hybrid block copolymers composed of a synthetic block and a peptide segment are an interesting class of materials, both from a structural and a functional point of view [14-16]. Peptide sequences can adopt ordered conformations such as a-hehces or /J-strands. In the former case, this leads to block copolymers with rod-coil character. Peptide sequences with a /1-strand conformation can un-... 

S.-M. Park, O.-H. Park, J.Y Cheng, C.T. Rettner, H.-C. Kim, Patterning sub-lOnm line patterns from a block copolymer hybrid, Nanotechnology 19 (2008) 455304. 

Walter, M.V., Lundberg, P., Hult, D., Hult, A., Malkoch, M. A one component methodology for the fabrication of honeycomb films from biocompatible amphiphilic block copolymer hybrids a linear-dendritic-linear twist. Polym. Chem 4, 2680-2690 (2013)... 

M. Zorn, W. K. Bae, J. Kwak, H. Lee, C. Lee, R. Zentel, K. Char, Quantum Dot-Block Copolymer Hybrids with Improved Properties and Their Apphcation to Quantum Dot Light-Emitting Devices. ACS Nano 2009, 3, 1063-1068. 

The development of controlled polymerization methods for the ring-opening polymerization of NCAs by the groups of Deming, Schlaad, and Hadjichristidis has intensified research in the field of block copolymer hybrids containing homopolypeptide fragments. " ... 

T., Hult, A., and Malkoch, M. (2013) Multifunctional Poly(ethylene glycol) synthesis, characterization, and potential applications of dendritic-linear-dendritic block copolymer hybrids. Macromolecules, 46 (10), 3726-3736. 

Hybrids of block copolymer rubbers and acrylics have also been used to increase the low-temperature impact resistance of the adhesive used for body-side molding attachment [127]. To further enhance performance, a new type of hybrid adhesive has been developed, which combines an adhesive polymer, like an... 

Simon P.F.W., Ulrich R., Spiess H.W., and Wiesner U. Block copolymer-ceramic hybrid materials from organically modified ceramic precursors, Chem. Mater., 13, 3464, 2001. 

Hamley IW, Ansari A, Castelletto V et al (2005) Solution self-assembly of hybrid block copolymers containing poly(ethylene glycol) and amphiphilic beta-strand peptide sequences. 

Liu B, Lewis AK, Shen W (2009) Physical hydrogels photo-cross-linked from self- assembled macromers for potential use in tissue engineering. Biomacromolecules 10 3182-3187 Vandermeulen GWM, Tziatzios C, Duncan R et al (2005) Peg-based hybrid block copolymers containing alpha-helical coiled coil peptide sequences control of self- assembly and preliminary biological evaluation. Macromolecules 38 761-769... 

Vandermeulen GWM, Tziatzios C, Klok HA (2003) Reversible self-organization of poly (ethylene glycol)-based hybrid block copolymers mediated by a de novo four- stranded alpha-helical coiled coil motif Macromolecules 36 4107 114... 

Bravo, 1984). Hybrids of these systems, where chromatography and electrophoresis are used in each spatial dimension, were reported nearly 40 years ago (Efron, 1959). Belenkii and coworkers reported on the analysis of block copolymers by TLC (Gankina et al., 1991 Litvinova et al., 1991). Two-block copolymers of styrene and f-butyl methacrylate were separated first with regard to chemical composition by TLC at critical conditions, followed by a SEC-type separation to determine the molar masses of the components. 

Time-resolved in situ Small Angle Neutron Scattering (SANS) investigations have provided direct experimental evidence for the initial steps in the formation of the SBA-15 mesoporous material, prepared using the non-ionic tri-block copolymer Pluronic 123 and TEOS as silica precursor. Upon time, three steps take place during the cooperative self-assembly of the Pluronic micelles and the silica species. First, the hydrolysis of TEOS is completed, without modifications of the Pluronic spherical micelles. Then, when silica species begin to interact with the micelles, a transformation from spherical to cylindrical micelles takes place before the precipitation of the ordered SBA-15 material. Lastly, the precipitation occurs and hybrid cylindrical micelles assemble into the two-dimensional hexagonal structure of SBA-15. 

Figure 2 Evolution of the neutron scattering intensities with time. Only spherical micelles of P123 block copolymer are present in the synthesis mixture within the first few minutes of the reaction (300 s), during the hydrolysis of the silica precursor. Then, hybrid organic-inorganic cylindrical micelles are detected (300-1400 s). The SBA-15 hexagonal phase is formed when the precipitation occurs, after 1400 s.

Polyether-polyester polyol hybrids, 25 472 Polyetherimide-polysiloxane block copolymers, 24 698, 704, 708... 

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