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Noncovalent Grafting of Carbon Nanotubes with Triblock Terpolymers : Toward Patchy 1D Hybrids

Title data

Gegenhuber, Thomas ; Gröschel, André H. ; Löbling, Tina I. ; Drechsler, Markus ; Ehlert, Sascha ; Förster, Stephan ; Schmalz, Holger:
Noncovalent Grafting of Carbon Nanotubes with Triblock Terpolymers : Toward Patchy 1D Hybrids.
Molecular Materials, Department of Applied Physics, School of Science Aalto University, 00076 Aalto, Finland
In: Macromolecules. Vol. 48 (2015) Issue 6 . - pp. 1767-1776.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma5023378

Project information

Project financing: Deutsche Forschungsgemeinschaft
Elite Network Bavaria
Academy of Finland’s Centre of Excellence Program
ERC-2011-AdG (291364-MIMEFUN)

Abstract in another language

The chemical structure and high aspect ratio of carbon nanotubes (CNTs) give rise to numerous exceptional physical properties but are also the origin for their intrinsic tendency to agglomerate. Since the full potential of CNTs is harnessed in homogeneous dispersions, e.g. in a polymer matrix, bundling of CNTs must be suppressed by compatibilizing unfavorable interfaces. We present a robust, noncovalent functionalization of multiwalled CNTs via physical grafting of polystyrene-block-polyethylene-block-poly(methyl methacrylate) (SEM) triblock terpolymers to the CNT surface in organic media. In an ultrasound-assisted approach at ambient temperature, the polyethylene (PE) middle block of SEM strongly adsorbs to the CNTs surface, yielding long-term stable dispersions of well-separated 1D hybrids with up to 3 wt % CNT content. Importantly, the strong affinity of PE toward CNTs prevents polymer desorption irrespective of the solvent conditions. The incompatible polystyrene (PS) and poly(methyl methacrylate) (PMMA) end blocks of SEM self-assemble into alternating PS/PMMA corona patches and provide excellent steric stabilization for the CNTs. Shorter PS and PMMA blocks give access to dispersions with higher CNT concentration and are more efficient in stabilizing longer CNTs. Unlike covalent functionalization methods, our approach preserves the conjugated sp2-structure of the CNTs and provides an efficient, simple and time-saving method for the preparation of polymer stabilized CNTs. The patchy PS/PMMA corona of the 1D hybrids is able to adapt to the surrounding environment as demonstrated on efficient high-content blending of PMMA with 5 wt % of well-dispersed CNT/SEM hybrids.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry I - Univ.-Prof. Dr. Stephan Förster
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 12 Dec 2019 09:39
Last Modified: 12 Dec 2019 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/53566