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Small-angle neutron scattering from diblock copolymer poly(styrene-d8)-b-poly(γ-benzyl L-glutamate) solutions: Rod-coil to coil-coil transition

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48195

Klok,  Harm-Anton
MPI for Polymer Research, Max Planck Society;

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Zitation

Crespo, J. S., Lecommandoux, S., Borsali, R., Klok, H.-A., & Soldi, V. (2003). Small-angle neutron scattering from diblock copolymer poly(styrene-d8)-b-poly(γ-benzyl L-glutamate) solutions: Rod-coil to coil-coil transition. Macromolecules, 36(4), 1253-1256.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-627E-F
Zusammenfassung
The elastic properties of rod-coil diblock copolymer poly(styrene-d8)-b-poly(γ-benzyl L-glutamate) (PSd-b- PBLG) rod-coil diblock copolymer solutions were investigated using small-angle neutron scattering (SANS). PBLG is known to undergo a transition from a rodlike a-helical. secondary structure to a random coil conformation under specific solvent conditions: the PBLG is (i) rodlike in dioxane and GO random coil in dioxane/trifluoroacetic acid (80/20). For the PSd-b- PBLG diblock copolymer, this conformational transition results in a topological change from a rod-coil to a coil-coil type structure. SANS results indeed show the presence of the expected scattering peaks-copolymer signature-for both conformational topologies. The position and the height of these scattering peaks are found in good agreement with a recent theoretical model that describes the conformational change in rod-coil diblock copolymer solutions. Circular dichroism experiments confirmed the change in secondary structure in the peptide block that accompanies the topological transition observed by SANS.