Non-covalent functionalization of single walled carbon nanotubes with pyrene pendant polyester: A DFT supported study

Abstract

Non-covalent attachment onto single-walled carbon nanotubes (SWCNTs) by protecting nanotubes' intrinsic properties has an important role in development of hybrid composite materials. Herein, we present non-covalent functionalization of SWCNTs with pyrene-containing novel polyester. The preparation of polyester involving electron deficient internal alkyne units was achieved by an esterification reaction between acetylene dicarboxylic acid and 1,4-butandiol. Subsequently, pyren-1-ylmethyl 3-azidopropanoate was incorporated into the polyester via the 1,3-dipolar cycloaddition reaction at a moderately low temperature in 1,4-dioxane yielding pyrene-pendant polyester (PE-Py). Finally, PE-Py was physically loaded on SWCNTs under mild conditions at ambient temperature. Characterization processes were thoroughly carried out by H-1 NMR, GPC, TGA, FT-IR and HR-TEM analyses for both polymer and modified-SWCNTs. In this work we report the first theoretical study of the physically adsorption of pyrene-pendant polyesters on SWCNTs using density functional theory (DFT) calculations to support experimental results. Our study is promising to combine both experimental and theoretical study on SWCNTs' functionalization.