Cross-Linking of Multiwalled Carbon Nanotubes with Polymeric Amines

Abstract

Functionalization of carbon nanotubes is considered as an essential step to enable their manipulation and application in potential end-use products. In this paper we introduce a new approach to functionalize multiwalled carbon nanotubes (MWNTs) by applying an amidation-type grafting reaction with amino-functionalized alternating polyketones. The functionalized MWNTs were characterized by using thermogravimetric analysis (TGA), X-ray photoemission spectroscopy (XPS), element analysis, Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Around 40 wt % polyamines based on the total weight of the MWNTs can be covalently attached to the surface of the MWNTs. It is found that polyamines act as crosslinking agents to interconnect or cross-link the MWNTs within and between bundles, as demonstrated by SEM and TEM analysis. After cross-linking, the functionalized MWNTs are insoluble in any solvent. The cross-linked MWNTs can be melt-blended into polyethylene, and the resulting composites show comparable mechanical properties to those obtained by simple blending of "un-cross-linked" nanotubes with polyethylene.

Facile approach to prepare multi-walled carbon nanotubes/graphene nanoplatelets hybrid materials

“…In addition, it should be noted that the G band of MWCNTs was divided into two bands, and the new D′ band at 1,604 cm −1 could be related to the extent of the disorder [19,20]. It was worth noting that the D′ band was hardly observed for other samples, which indicated that GnPs and hybrid materials have the smallest amount of impurities.…”

Nanocomposite Scaffold for Chondrocyte Growth and Cartilage Tissue Engineering: Effects of Carbon Nanotube Surface Functionalization

“…Acid reflux of SWNTs and other nanotubes has been widely used to attach carboxyl groups to their surfaces (e.g., SWNT-COOH). [7][8][9][10] These carboxylated nanotubes can be further derivatized to covalently link the SWNTs with other polymers (e.g., PEG), effectively increasing their solubility and biocompatibility. [7][8][9] Many biomaterials have been used for cartilage tissue engineering applications, as previously summarized.…”

“…[7][8][9][10] These carboxylated nanotubes can be further derivatized to covalently link the SWNTs with other polymers (e.g., PEG), effectively increasing their solubility and biocompatibility. [7][8][9] Many biomaterials have been used for cartilage tissue engineering applications, as previously summarized. 2,3,11,12 Whereas hydrogels are an attractive option because of their biocompatibility, capacity to incorporate chemical cues, and innate hydrated structure, their mechanical properties are often inferior to that of native cartilage.…”

Electrical and thermal conductivities of novel metal mesh hybrid polymer composite bipolar plates for proton exchange membrane fuel cells

“…After this procedure, the functionalized MWCNTs (MWCNTs-COCl) with carbonyl chloride groups were prepared via the reaction of thionyl chloride with carboxyl-contained MWNT (MWNT-COOH) [30][31][32]. Finally, poly(oxyalkylene)-diamines (POA)-maleic anhydride (MA), abbreviated as POAMA (each POA bearing one MA, details of the preparation was illustrated in our previous paper [17]), molecules were introduced onto the surface of MWCNTs by the reaction of MWCNTs-COCl with amine group.…”