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Surface modification of multiwalled carbon nanotubes via esterification using a biodegradable polyol.

B Fernandez d'Arlas¹, S Goyanes, G H Rubiolo

¹'Materials+ Technologies' Group, Department of Chemical and Environmental Engineering, Eskola Politeknikoa, Euskal Herriko Unibertsitatea, Pza Europa 1, 20018 Donostia-San Sebastián, Spain

Journal of Nanoscience and Nanotechnology

|November 14, 2009

Summary

Surface modification of multiwalled carbon nanotubes (MWCNT) via oxidation and esterification successfully grafted polymer chains onto the nanotube surface, enhancing their functionality for advanced applications.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Multiwalled carbon nanotubes (MWCNT) possess unique properties but require surface functionalization for improved compatibility and performance in composite materials.
Introducing carboxylic acid groups enhances the reactivity of MWCNTs for further chemical modifications.

Purpose of the Study:

To functionalize MWCNTs by grafting polymer chains onto their surface.
To investigate the feasibility of using esterification for covalently attaching poly(hexamethylene carbonate-co-caprolactone)diol to oxidized MWCNTs.
To characterize the modification process and confirm successful polymer grafting.

Main Methods:

Oxidation of MWCNTs using a H2SO4/HNO3 mixture to introduce carboxylic groups (MWCNT-COOH).
Esterification reaction between MWCNT-COOH and poly(hexamethylene carbonate-co-caprolactone)diol in tetrahydrofuran (THF).
Characterization using FT-IR, UV spectroscopy, solubility tests, TGA, and AFM.

Main Results:

Successful introduction of carboxylic groups onto the MWCNT surface.
Evidence of successful esterification and grafting of polymer chains onto the MWCNTs.
Characterization techniques confirmed the chemical modification and successful attachment of the polyol.

Conclusions:

The surface carboxylic groups on oxidized MWCNTs are sufficiently reactive for grafting polymer chains.
The esterification method is effective for covalently linking poly(hexamethylene carbonate-co-caprolactone)diol to MWCNTs.
This surface modification enhances MWCNT functionality, opening possibilities for novel material development.