Synthesis and Characterization of Polyurethane-Grafted Single-Walled Carbon Nanotubes via Click Chemistry

Abstract

Polyurethane (PU)-grafted carbon nanotubes were synthesized by the coupling of alkyne moiety decorated single walled carbon nanotube (SWCNT) with azide moiety containing PU using Cu(I) catalyzed Huisgen [3 + 2] cycloaddition click chemistry. The azide moiety containing poly(s-caprolactone)diol was synthesized by ring-opening polymerization and further used for PU synthesis. Alkyne-functionalizion of SWCNT was completed by the reaction of p-aminophenyl propargyl ether with SWCNT using a solvent free diazotization procedure. Nuclear magnetic resonance, Fourier transform infrared, and Raman spectroscopic measurements confirmed the functionalization of SWCNT. Scanning electron microscopy and transmission electron microscopy images showed an excellent dispersion of SWCNTs, and specially debundling of SWCNTs could be observed due to polymer assisted dispersion. A quantitative grafting was successfully achieved even at high content of functional groups.

Modification of PEG-b-PCL block copolymer with high melting temperature by the enhancement of POSS crystal and ordered phase structure

“…The monomer was synthesized using the similar procedure as reported earlier. 11,12,25 3-Chloroperoxybenzoic acid (18.01 g, 75%) with 100 mL DCM was directly mixed with 9.14 g a-chlorocyclohexanone. Stirring was continued for additional 96 h at room temperature.…”

Mechanical, Thermal and Morphological Characterization of Polycarbonate/Oxidized Carbon Nanofiber Composites Produced with a Lean 2-Step Manufacturing Process

“…[2][3] Carbon nanofibers (CNFs) and carbon nanotubes (CNTs) have been extensively studied and applied as fillers for improving various properties of polymers due to their excellent mechanical, electrical and thermal properties. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] CNFs are currently being produced in volume and are significantly less expensive fillers when compared to CNTs. [23][24] Hammel et al found that CNFs are more * Author to whom correspondence should be addressed.…”

Cycloaddition Reactions: A Controlled Approach for Carbon Nanotube Functionalization

“…Cu I -catalyzed alkyne-azide click chemistry can proceed with other chemical reactions, such as ATRP polymerization, with a one-pot procedure; this route could play a major role in the preparation of multifunctional tailored materials based on CNTs. [55] The grafting of PU was controlled by changing the ratio of azide-poly(e-caprolactone)diol as soft segments in PU. [51] MWNTs were functionalized with amphiphilic/Janus polymer brushes using a clickable macro initiator, poly[3-azido-2-(2-bromo-2-methylpropanoyloxy)propyl methacrylate] (polyBrAzPMA), with alkyl bromo functionality, which works as an initiator for ATRP and provides azide functionality for the click coupling reaction.…”

“…The micelle size and transition temperature can be controlled through the NIPAAm block length. Shape‐memory polyurethane (PU) block‐copolymer‐grafted‐SWNTs were prepared by coupling of an azide‐moiety‐containing PU with alkyne‐moiety‐decorated SWNTs 55. The grafting of PU was controlled by changing the ratio of azide‐poly(ε‐caprolactone)diol as soft segments in PU.…”