Multiwalled carbon nanotubes and nanofibers grafted with polyetherketones in mild and viscous polymeric acid

Towards the development of poly(phenylene sulphide) based nanocomposites with enhanced mechanical, electrical and tribological properties

“…The average bundle diameter seems to be larger than that of the reference sample; this increase in size could be ascribed to the polymer coating around the nanotube surfaces. Similar behaviour of bundle diameter increment has been reported for poly(ether ketone)s grafted to MWCNTs [22]. The images reveal that the grafting process improved the dispersion of the SWCNTs, leading to larger nanofiller-matrix effective contact area.…”

“…The noticeable T g increment observed in the composites incorporating PPS-NH2 should be ascribed to the existence of strong interactions between the components through covalent and hydrogen bonds. Analogous behaviour of T g enhancement has been reported for nanocomposites based on poly(ether ketone) matrices covalently anchored to CNTs [22,23]. However, other authors dealing with PS [8] and SAN [24] composites found a small decrease in the T g with the addition of polymer-grafted MWCNTs, attributed to the lubricant role of the nanotube surface.…”

In situ-polymerization of fluorinated polyoxadiazole with carbon nanotubes in poly(phosphoric acid)

“…Although the addition of CNT into polymeric materials exhibits a high potential of application in different research fields, there are still many limitations and challenges to be met such as the manufacturing route and surface properties of nanoparticles, which influence the resulting 2 degree of dispersion and interfacial adhesion with the polymer matrix. Various physical, chemical, or combined approaches have been reported to afford homogeneous dispersion of CNTs in polymer solution or melt [1][2][3][4][5]. Functionalization of fillers has been shown to reduce agglomeration and to improve the interaction between the fillers and the polymeric matrix [3,4].…”

“…Various physical, chemical, or combined approaches have been reported to afford homogeneous dispersion of CNTs in polymer solution or melt [1][2][3][4][5]. Functionalization of fillers has been shown to reduce agglomeration and to improve the interaction between the fillers and the polymeric matrix [3,4].…”

“…Recently, Oh et al [4] described a grafting of polyetherketone onto multi-walled carbon nanotube (MWCNT) by in-situ polycondensation of the AB monomers, 3-and 4-phenoxybenzoic acids in viscous PPA at 130°C for 48h. In the present work, in-situ polymerizations of fluorinated polyoxadiazole through a polycondensation reaction of A-A (hydrazine sulphate) and B-B (aromatic dicarboxylic acid) monomers with MWCNT in polyphosphoric acid were performed in the frame of time 3 to 48h.…”