Polymer-grafted multi-walled carbon nanotubes through surface-initiated ring-opening polymerization and click reaction

Facile Synthesis and Enhanced Nonlinear Optical Properties of Porphyrin‐Functionalized Multi‐Walled Carbon Nanotubes

“…This is not unusual for covalently functionalized MWCNTs (the covalently functionalization does not cause any significant increase in the sp 3 -hybridized carbon atom because it take place solely on the outer nanotube layer), similar results having been observed. [53][54][55] For the covalently functionalized MWCNT nanohybrids, the porphyrin molecules grafted to the surface of the MWCNTs form nanoscale layers of coverage, resulting in an increase in the absorption intensity of the sp 2 -hybridized carbon atoms. [54] The D-band is, as mentioned above, assigned to lattice distortions and/or the amorphous carbon in the samples, but a significant component of the latter is removed after reaction; consequently, any in-crease of the intensity of the D-band due to the functionalization is more than offset by a simultaneous decrease due to purification.…”

“…[53][54][55] For the covalently functionalized MWCNT nanohybrids, the porphyrin molecules grafted to the surface of the MWCNTs form nanoscale layers of coverage, resulting in an increase in the absorption intensity of the sp 2 -hybridized carbon atoms. [54] The D-band is, as mentioned above, assigned to lattice distortions and/or the amorphous carbon in the samples, but a significant component of the latter is removed after reaction; consequently, any in-crease of the intensity of the D-band due to the functionalization is more than offset by a simultaneous decrease due to purification. [55] Although further studies are needed to fully understand the effects of porphyrin grafting to MWCNTs on the intensity of the Raman signals, [56] it should be noted that similar results are observed for the second-order mode of the D-band (ñ = 2677, 2672, and 2670 cm À1 for MWCNTs, MWCNT-TPP, and MWCNT-ZnTPP, respectively) and for the combination of D-and G-bands (ñ = 2918, 2916, and 2916 cm À1 for MWCNTs, MWCNT-TPP, and MWCNT-ZnTPP).…”

Surface-Initiated Anionic Polymerization from Nanomaterials

“…Several methods have been reported to introduce hydroxyl groups on CNTs for the polymerization of ε-caprolactone and other monomers using ROP [84][85][86]. The reaction of pristine MWNTs with various azide compounds via 1,3-cycloaddition [84], the use of diradicals via Bergman cyclization [85], and the conversion of acid groups of MWNTs to azide for copper-catalyzed Huisgen's 1,3-dipolar cycloaddition [86] with various functional alkynes are a few of these methods.…”

“…The reaction of pristine MWNTs with various azide compounds via 1,3-cycloaddition [84], the use of diradicals via Bergman cyclization [85], and the conversion of acid groups of MWNTs to azide for copper-catalyzed Huisgen's 1,3-dipolar cycloaddition [86] with various functional alkynes are a few of these methods.…”

Environmentally friendly polymer nanocomposites using polymer matrices from fossil fuel sources

“…Recently, a number of researchers have used the in-situ polymerization technique for the preparation of CNT-containing nanocomposites of PCL. [74][75][76] To further improve on the dispersion of CNTs in PCL, acrylic acid-grafted PCL (PCL-g -AA) and multi-hydroxyl functionalized MWNTs (MWNTs-OH) were used as alternatives to produce quality nanocomposites via simple melt blending. 62 The formation of ester groups was through the reaction between carboxylic acid groups of PCL-g -AA and hydroxyl groups of MWNTs-OH.…”