Journal
POLYMER CHEMISTRY
Volume 5, Issue 8, Pages 2747-2755Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3py01657a
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Funding
- Air Force Office of Scientific Research [FA9550-13-1-0101]
- Key Laboratory of Computational Physical Sciences at Fudan University
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A new class of star-shaped coil-rod diblock copolymer polystyrene-block-poly(3-hexylthiophene) (PS-b-P3HT) with well-defined structures and the ratio of coil to rod blocks were synthesized by a combination of atom transfer radical polymerization, the Grignard metathesis method, and click reaction. The star-shaped PS-b-P3HT diblock copolymers covalently connected to a beta-cyclodextrin (beta-CD) core were composed of 21-arm coil-like PS inner blocks and rod-like conjugated polymer P3HT outer blocks with narrow molecular weight distribution. The intermediate and final products were systematically characterized and confirmed by gel permeation chromatography (GPC), H-1 nuclear magnetic resonance (H-1-NMR), and Fourier transfer infrared (FTIR) spectroscopy. The optical properties of star-shaped PS-b-P3HT were examined by UV-Vis absorption and photoluminescence (PL) measurements. In comparison to the linear P3HT, due to their compact structure and the introduction of PS blocks, the optical properties of 21-arm, star-shaped PS-b-P3HT were altered. The star-shaped PS-b-P3HT formed unimolecular micelles in good solvent as revealed by dynamic light scattering (DLS) and atomic force microscopy (AFM) studies.
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