Preparation and Characterization of Chitosan-Blended Multiwalled Carbon Nanotubes

Abstract

Composites comprised of chitosan (CS) and multiwalled carbon nanotubes (MWCNTs)were fabricated by milling and ultrasonication dispersion methods. Scanning electron microscopy images showed homogeneous dispersion of MWCNTs throughout the CS matrix for samples prepared by either ultrasonication or milling methods. Further, the crystallinity of the CS component was found to decrease with the addition of MWCNTs, although the decomposition temperature and the storage modulus (E ) of the samples were improved. The decomposition temperature for the composite prepared by milling was 7 • C higher than that by the ultrasonication. Meanwhile, the E decreased relatively slowly with temperature in the dynamic mechanical analysis measurements. In addition, IR analysis implied an interaction between CS and MWCNTs, which likely originated from hydrogen bonds between the amino, hydroxyl, and carboxyl groups of the two components. Compared with the ultrasonication, milling was more effective to promote the formation of the hydrogen bonds between CS and the MWCNTs and thus enhance the thermal stability of CS.

A porous hybrid imprinted membrane for selectively anchoring target proteins from a complex matrix

“…44 The DSC thermogram of pure chitosan shows a T g , T m and T d of 79.5, 192.9 and 312.7 C, respectively (Table 3). The results correspond with the results of Rachipudi et al 44 and He et al, 45 but the T g is quite different from the T g of 203 C reported by Sakurai et al 33 These results are likely attributable to the different molecular weights and deacetylation degrees of the CS or the different procedures for the DSC measurements. Fig.…”

“…These results agree with previous research. 45 3.2.5 XRD. The crystalline properties of the membranes were analyzed with an X-ray diffractometer, as shown in Fig.…”

Chitosan–graphene oxide nanocomposites: Effect of graphene oxide nanosheets and glycerol plasticizer on thermal and mechanical properties

“…The TGA permits to conclude that unplasticized CS and CS/GO nanocomposites are more thermo‐oxidative stable than the glycerol‐plasticized samples. The effect of CNT on the thermal stability of CS composites has been reported in the literature . Azeez et al .…”

“…Azeez et al . and He et al . found that the addition of CNT to the CS marginally improved the thermal stability of the nanocomposites, while Tang et al .…”