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Issue 21, 2009
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Polymer grafted Janus multi-walled carbon nanotubes

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We describe a novel and facile strategy to modify the surface of carbon nanotubes (CNTs) with two chemically different polymer brushes utilizing the ‘grafting from’ technique. A [4 + 2] Diels–Alder cycloaddition reaction was used to functionalize multi-walled carbon nanotubes (MWNTs) with two different precursor initiators, one for ring opening polymerization (ROP) and one for atom transfer radical polymerization (ATRP). The binary functionalized MWNTs were used for the simultaneous surface initiated polymerizations of different monomers resulting in polymer grafted MWNTs that can form Janus type structures under appropriate conditions. 1H NMR, FTIR and Raman spectra showed that the precursor initiators were successfully synthesized and covalently attached on the CNT surface. Thermogravimetric analysis (TGA) revealed that the grafted polymer content varies when different monomer ratios and polymerization times are used. The presence of an organic layer around the CNTs was observed through transmission electron microscopy (TEM). Differential scanning calorimetry (DSC) proved that the glass transition (Tg) and melting (Tm) temperatures of the grafted polymers are affected by the presence of the CNTs, while circular dichroism (CD) spectra indicated that the PLLA α-helix conformation remains intact.

Graphical abstract: Polymer grafted Janus multi-walled carbon nanotubes

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Article information

22 Apr 2009
09 Jul 2009
First published
02 Sep 2009

Soft Matter, 2009,5, 4272-4278
Article type

Polymer grafted Janus multi-walled carbon nanotubes

D. Priftis, G. Sakellariou, D. Baskaran, J. W. Mays and N. Hadjichristidis, Soft Matter, 2009, 5, 4272
DOI: 10.1039/B908100C

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