engleski

Surface functionalization of titanate nanotubes with acryloyl chloride

1D nanostructured sodium titanates, (nanotubes (NaTiNT) and nanoribbons (NaTiNR)) have been the subject of extensive research due to their high surface area, semi-conducting and catalytic properties. Lately it was also suggested that sodium titanate nanoribbons (NaTiNRs) could also be used for the reinforcement of a polymer matrix, since their Young’s modulus is comparable to that of carbon nanotubes.1 According to our knowledge there are only few published articles regarding the preparation of polymer nanocomposites that based on functionalized or non-functionalized NaTiNT and NaTiNR.2-4 NaTiNT and NaTiNR were functionalized by acryloil chloride. The modification should give the nanoparticles (NT-A, NR-A) with pendant unsaturated acrylic groups, able to polymerise with unsaturated polyester resin. In FTIR spectra of modified nanoparticles there were very small bands around 2900 cm-1 indicating the presence of C-H groups, and more intense bands in a region 10001600 cm-1. In the XRD spectra of modified NTs there are also several new sharp diffractions indicating changes in crystal structure. Those changes add thermally weak points in titanate nanostructure as proved with TGA analysis. Weight loss is observed above 750 °C, where non-modified titanates are stable. Nanocomposites of unsaturated polyester (UP) with 1%, 2% and 3% of modified NT A or NR A were prepared and thermo-mechanical properties were determined by DMA. The presence of titanates did not influence the glass transition of UP resin. The storage modulus increased with addition of titanates. The increase is bigger with NT A than NR A.

Functionalizaion ; Titanate ; Nanotubes ; Nanoribbons

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