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Journal Article

Hierarchical self-assembly of poly(γ-benzyl-L-glutamate)-poly(ethylene glycol)-poly(γ-benzyl-L-glutamate) rod-coil-rod triblock copolymers

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons47884

Floudas,  G.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48551

Papadopoulos,  P.
MPI for Polymer Research, Max Planck Society;

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

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48905

Vandermeulen,  G. W. M.
MPI for Polymer Research, Max Planck Society;

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Citation

Floudas, G., Papadopoulos, P., Klok, H.-A., Vandermeulen, G. W. M., & Rodriguez-Hernandez, J. (2003). Hierarchical self-assembly of poly(γ-benzyl-L-glutamate)-poly(ethylene glycol)-poly(γ-benzyl-L-glutamate) rod-coil-rod triblock copolymers. Macromolecules, 36(10), 3673-3683.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-62DD-A
Abstract
The self-assembly mechanism has been studied in poly(γ-benzyl-L-glutamate)-poly(ethylene glycol)-poly(γ-benzyl-L-glutamate) (PBLG-PEG-PBLG) triblock copolymer melts using X-ray scattering, polarizing optical microscopy, differential scanning calorimetry, and FTIR spectroscopy. Intrinsic competing interactions (crystallization, hydrogen bonding, liquid crystallinity, microphase separation) give rise to different levels of organization. Depending on the peptide volume fraction f, two cases can be discussed: for low peptide volume fractions, microphase separation results in PBLG and PEG phases rich in all secondary structures (α-helices, β-sheets, and chain-folded PEG) notwithstanding the large undercooling necessary to induce PEG crystallization. For f > 0.4, interfacial mixing results in the destruction of the less coherent peptide secondary structures (β-sheet). Interfacial mixing may prove to be a key factor in controlling the appearance of β-sheets in low molecular weight peptides.