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Modular ambient temperature functionalization of carbon nanotubes with stimuli-responsive polymer strands

: Zydziak, N.; Hübner, C.; Bruns, M.; Vogt, A.P.; Barner-Kowollik, C.


Polymer chemistry 4 (2013), Nr.5, S.1525-1537
ISSN: 1759-9954
ISSN: 1759-9962
Fraunhofer ICT ()

Cyclopentadienyl end-capped poly(N-isopropylacrylamide) (PNIPAM-Cp, M-n = 5400 g mol(-1), PDI = 1.13) was synthesized via a combination of RAFT (Reversible Addition-Fragmentation Chain Transfer) polymerization and modular conjugation (characterized via Nuclear Magnetic Resonance (NMR) as well as Electrospray Ionization-Mass Spectrometry (ESI-MS)), and reacted with untreated Single Walled Carbon Nanotubes (SWCNTs) as dienophiles in a Diels-Alder reaction with PNIPAM-Cp (diene) at ambient temperature in the absence of any catalyst. The obtained stimuli-responsive hybrid materials display thermo-responsive behaviour evidenced via UV-VIS-spectroscopy and Dynamic Light Scattering (DLS). The grafting density of the PNIPAM chains at the surface of the SWCNTs was determined via Thermogravimetric Analysis (TGA), Elemental Analysis (EA) and X-ray Photoelectron Spectroscopy (XPS), to be close to 0.0288 chains per nm(2).