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Title: 3D scaffolds from vertically aligned carbon nanotubes/poly(methyl methacrylate) composites via atom transfer radical polymerization
Author: Tebikachew, Behabtu
Magina, Sandra
Mata, Diogo
Oliveira, Filipe J.
Silva, Rui F.
Barros-Timmons, Ana
Issue Date: 2015
Abstract: Vertically aligned carbon nanotubes (VACNTs) synthesized by Thermal Chemical Vapour Deposition (TCVD) were modified using an Ar:O-2 (97:3) plasma to generate oxygen-containing functional groups on the surface for subsequent modification. X-ray photo-emission spectroscopy (XPS) and micro-Raman analyses confirmed the grafting of those functional groups onto the surface of the nanotubes as well as the removal of amorphous carbon produced and deposited on the VACNT forests during the CVD process. The plasma treated VACNT forests were further modified with 2-bromo-2-methylpropionyl bromide, an atom transfer radical polymerization (ATRP) initiator, to grow poly(methyl methacrylate) (PMMA) chains from the forests via ATRP. Scanning transmission electron microscopy (STEM) of the ensuing VACNT/PMMA composites confirmed the coating of the nanotube forests with the PMMA polymer. 3D scaffolds of polymeric composites with honeycomb like structure were then obtained. Compressive tests have shown that the VACNT/PMMA composite has higher compressive strength than the pristine forest. (C) 2014 Elsevier B.V. All rights reserved.
Peer review: yes
DOI: 10.1016/j.matchemphys.2014.10.032
ISSN: 0254-0584
Publisher Version: 10.1016/j.matchemphys.2014.10.032
Appears in Collections:CICECO - Artigos

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