Jump to main content
Jump to site search

Issue 23, 2019
Previous Article Next Article

Polyampholytic graft copolymers based on polydehydroalanine (PDha) – synthesis, solution behavior and application as dispersants for carbon nanotubes

Author affiliations

Abstract

We herein introduce a versatile platform of graft copolymers featuring a polyampholytic backbone and side chains of varying length and polarity using post-polymerization modification of polydehydroalanine (PDha). Nucleophilic substitution of the amino group with various modifiers in water allows the attachment of alkyl, fluoro alkyl, and aryl epoxides as well as a Michael acceptor (acrylonitrile), whereby the overall degree of functionalization (DoF) can be controlled by adjusting both concentration and reaction time. The synthesized graft copolymers were characterized by spectroscopic techniques (1H-NMR, 13C-NMR, solid state 13C-NMR, FT-IR), elemental analysis, and size exclusion chromatography (SEC) to prove successful grafting. By introduction of various side-chains, both the overall polarity and charge/charge density of the underlying PDha backbone changes, which is directly reflected in the solution behavior of the graft copolymers. We therefore investigated two examples by potentiometric titrations and ζ-potential measurements. As one example, modification with epoxyoctane led to amphiphilic graft copolymers which formed micelles in aqueous solution as revealed by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Even more, we could show that these materials are promising dispersants for carbon nanomaterials (MWCNTs) and even pH-dependent reversible dispersion formation was possible. In general, the presented synthetic strategy opens up a wide range of novel surfactants with precisely tunable composition, polarity, and functionality.

Graphical abstract: Polyampholytic graft copolymers based on polydehydroalanine (PDha) – synthesis, solution behavior and application as dispersants for carbon nanotubes

Back to tab navigation

Associated articles

Supplementary files

Article information


Submitted
27 Sep 2018
Accepted
26 Oct 2018
First published
30 Oct 2018

Polym. Chem., 2019,10, 3006-3019
Article type
Paper

Polyampholytic graft copolymers based on polydehydroalanine (PDha) – synthesis, solution behavior and application as dispersants for carbon nanotubes

J. B. Max, D. V. Pergushov, L. V. Sigolaeva and F. H. Schacher, Polym. Chem., 2019, 10, 3006 DOI: 10.1039/C8PY01390J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements