Jump to main content
Jump to site search


A pH and redox dual responsive homopolypeptide: synthesis, characterization, and application in “smart” single-walled carbon nanotube dispersion

Author affiliations

Abstract

A homopolypeptide, namely poly(S-(2-carboxylethyl)-L-cysteine) (PCELC), with pH and redox dual responsiveness was prepared by ring-opening polymerization of S-(2-(methoxycarbonyl)ethyl)-L-cysteine based N-carboxyanhydride (MCELC-NCA) and subsequent hydrolysis. The pH-induced solution phase transition of PCELC was at pH = ∼4.50 as revealed by DLS and UV-vis spectroscopy. The thioether linkages of PCELC can be readily oxidized by H2O2 at 40 °C yielding PCELCox with sulfoxide and sulfone linkages as revealed by 1H NMR and FTIR. PCELCox also showed pH responsiveness with the variation of polymer aggregation sizes, but without solution phase separation. PCELCox can be partially reduced by 3-mercaptopropionic acid as suggested by 1H NMR and FTIR analysis. The pH-induced solution phase transition behavior of the reduction product (i.e., PCELCre) was different from that of the as-prepared PCELC. Moreover, PCELC can be used as a pH and oxidation dual responsive stabilizer to control the aggregation of single-walled carbon nanotubes (SWCNTs) in aqueous solution.

Graphical abstract: A pH and redox dual responsive homopolypeptide: synthesis, characterization, and application in “smart” single-walled carbon nanotube dispersion

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Aug 2017, accepted on 26 Oct 2017 and first published on 27 Oct 2017


Article type: Paper
DOI: 10.1039/C7PY01393K
Citation: Polym. Chem., 2017, Advance Article
  •   Request permissions

    A pH and redox dual responsive homopolypeptide: synthesis, characterization, and application in “smart” single-walled carbon nanotube dispersion

    J. Xiao, J. Tan, R. Jiang, X. He, Y. Xu, Y. Ling, S. Luan and H. Tang, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY01393K

Search articles by author

Spotlight

Advertisements