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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 12/2014

01.12.2014 | Original Contribution

Synthesis and self-assembly in bulk of star-shaped block copolymers based on helical polypeptides

verfasst von: Juan Lin, Qing-Han Zhou, Li-Dong Li, Zhi-Nian Li

Erschienen in: Colloid and Polymer Science | Ausgabe 12/2014

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Abstract

A series of star-shaped copolymers containing poly (styrene) (PS) and poly(γ-benzyl-l-glutamate) (PBLG) were synthesized by click reaction from alkyne- and azide-functionalized homopolymers. The α-azide PS star-shaped homopolymer was synthesized by copper-mediated atom transfer radical polymerization from a bromine-containing star-shaped initiator, and α-alkyne PBLG homopolymers were synthesized by ring-opening polymerization of γ-benzyl-l-glutamate N-carboxyanhydride with an amino-containing α-alkyne initiator. The molecular structures of the homopolymers and star-shaped block copolymers were confirmed by 1H nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography analysis. The self-assembling behavior of the star-shaped block copolymers in bulk was investigated using wide-angle X-ray diffraction, and small-angle X-ray scattering. For star-shaped block copolymer at lower f PS of ~0.27, PBLG segment was assigned to a hexagonally packed-cylinder structure (Φ H) based on the rod-like α-helix conformation as shown in FTIR spectra. By increasing f PS to ~0.42, a proposed microphase-separated double-hexagonal morphology was observed, in which PBLG rods formed the core of the columns by interdigitated packing in Φ H phase with PS domain as the matrix in a larger hexagonal columnar structure. The proposed structure was based on calculation from the simulated molecular length of each block of the copolymer and experimental analyses.
Vorheriger Artikel Interaction between biosurfactant surfactin and cationic surfactant cetyl trimethyl ammonium bromide in mixed micelle
Nächster Artikel Drying dissipative structures of arrowroot starch

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Metadaten
Titel
Synthesis and self-assembly in bulk of star-shaped block copolymers based on helical polypeptides
verfasst von
Juan Lin
Qing-Han Zhou
Li-Dong Li
Zhi-Nian Li
Publikationsdatum
01.12.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 12/2014
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-014-3345-2

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