Covalent functionalization of MWCNTs with poly(p-phenylene sulphide) oligomers: a route to the efficient integration through a chemical approach

Abstract

We report a new strategy to obtain high performance polymer-grafted multi-walled carbon nanotubes (MWCNTs). Chlorophenyl-functionalized MWCNTs, obtained through the in situ generation and reaction of diazonium compounds, were subjected to polymerization in the presence of Na 2 S and 1,4dichlorobenzene in order to yield MWCNTs covalently functionalized with poly(p-phenylene sulfide) (PPS) oligomers. The MWCNT functionalization and the PPS oligomeric chain growth can be controlled throughout accessible experimental variables, including the possibility to carry out the whole process in a one-pot reaction. This represents an efficient and facile route to develop covalently grafted MWCNTs beyond those reported so far for the same polymer. These materials are promising fillers for the production of high performance PPS-based composite materials, due to the improvement of the filler-matrix compatibility. The manufacturing and characterization of some test samples show that oligomer-grafted MWCNTs induce the suppression of the intrinsic confinement effect imposed by the nanofiller, as for the observation of an increase in the PPS crystallinity. An outstanding increase in the PPS thermal stability and mechanical properties is also observed, as compared to bare MWCNTs, while leaving the electrical properties unharmed.

Closing the pressure gap in x-ray photoelectron spectroscopy by membrane hydrogenation

“…Indeed, the following restrictions have been imposed to the three components of this fit. First, the latter have been ranked in terms of apparent binding energies, with respect to the expected electron densities of the carbons atoms, 39,40 that is, from highest to lowest: methyl groups, pyridine carbons (together with their π-π* transition characteristic of aromatic rings 41 ), and dioxime carbons. Second, the areas of these peaks were forced to fit with the concentration of each carbon in the molecule (e.g., the area of the red peak in Fig.…”

Synthesis and investigation of crystal structure and optical properties of brookite TiO2 nanoparticles capped with (2-chloroquinoline-3-yl) methanol

“…The peak at 285.69 eV can be ascribed to the C-O-Ti bond [35]. The other peaks at binding energies of 286.10 and 287.20 eV could be corresponded to C=N and C-Cl bonds, respectively [39,40].…”

Electrical and rheological percolation behavior of multiwalled carbon nanotube-reinforced poly(phenylene sulfide) composites

“…This result can be attributed to the formation of a conducting network of MWCNTs within PPS due probably to the high aspect ratio of the filler as well as its homogeneous dispersion in polymer matrix. 30 It is worth to mention that at 1.0 wt%, the electrical percolation does not exist. On the other hand, samples with 4.0 wt% of MWCNTs show the region where the percolation phenomenon is already established.…”