A pyrene-functionalized polytyrosine exhibiting aggregation-induced emission and capable of dispersing carbon nanotubes and hydrogen bonding with P4VP

作者：EL Mahdy, Ahmed F M; Kuo, Shiao Wei^*

来源：Polymer, 2018, 156: 10-21.

DOI：10.1016/j.polymer.2018.09.052

• Polypeptides
• Hydrogen bonding
• Carbon nanotube
• AIE

A new pyrene-functionalized polytyrosine (pyrene-PTyr) by using L-tyrosine-N-carboxyanhydride as monomer synthesized through simple ring-opening polymerization with 1,6-diaminopyrene (pyrene-2NH(2)) as the initiator. UV-Vis absorption spectra revealed that the absorption maxima of pyrene-2NH(2) and pyrene-PTyr were correlated to the solvent polarity. The photophysical properties of pyrene-2NH(2) and pyrene-PTyr were investigated using photoluminescence (PL) spectroscopy, which revealed that pyrene-2NH(2) displayed aggregation-caused quenching behavior, which transformed to aggregation-induced emission after incorporation into the rigid rod chains of polytyrosine. In addition, pyrene-PTyr could be blended with poly(4-vinylpyridine) (P4VP) to form supramolecular pyrene-PTyr/P4VP systems stabilized through hydrogen bonding. Thermal analyses revealed, through the appearance of the single T-g behavior, that all of the pyrene-PTyr/P4VP blends were completely miscible. FTIR spectral analyses revealed strong hydrogen bonding between in pyrene-PTyr/P4VP blends. Moreover, X-ray diffraction analyses indicated that the secondary structure for pyrene-PTyr converted from the beta-sheet to the random coil conformation after intermolecularly hydrogen bonding with P4VP. Furthermore, photographs, PL spectra, and transmission electron microscopy images indicated that the pyrene-PTyr polypeptide was an effective dispersant for multi-walled carbon nanotubes (MWCNTs), stabilized through strong pi-stacking between the pyrene units of pyrene-PTyr and the surfaces of the MWCNTs.

• 出版日期2018-11-7
• 单位中山大学