CIHIDECAR   12529
CENTRO DE INVESTIGACIONES EN HIDRATOS DE CARBONO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Influence to the spatial conformation of NT functionalized with different polymers according to their electronic distribution
Autor/es:
HERNÁN GARATE; ALEJANDRO DE FALCO; S. MORENO; MIRTA FASCIO; SILVIA GOYANES; D'ACCORSO NORMA B.
Lugar:
Buenos Aires, Argentina
Reunión:
Conferencia; At the Frontiers of Condensed Matter V; 2010
Institución organizadora:
Comisión Nacional de energía Atómica
Resumen:
The purpose of this work is to study the influence to the spatial
conformation of a polymer grafted onto multi-walled carbon nanotubes (MWCNT)
according to the differing electronic distribution of the polymers repetitive
unit. It is known that polymers with aromatic rings interact with the nanotube
through pi-pi staking interactions, tending to wrap the MWCNT and propitiating
a better dispersion of them in a solvent with affinity to the polymer or in the
polymer itself, leading to a composite material with well dispersed MWCNT. On
the other hand, if trying to anchor the MWNT to one of the phases of a block
copolymer, it would be more efficient to have the MWCNT functionalized with a
polymer that doesnt wrap the nanotube, thus allowing the anchorage by means of
inter-diffusion of the polymer into the block with more affinity to it. In this
work, we made a graft-from functionalization using as monomers: 4-vinylpyridine
(monomer with an aromatic substituent) and acrylonitrile (monomer with a non
aromatic, where the substituent is a nitrile group). The functionalization
efficiency was studied by spectroscopic and thermal technique. The spacial
conformations of the polymer around carbon nanotubes were studied by high
resolution transmission electron microscopy (HRTEM). It was seen, in both
cases, polymer wrapping the NT. However, for polymers with aromatic rings, this
effect is predominant, while with polyacrylonitrile derivates what can be seen
is polymer wrapped onto itself and bound to the MWCNTs wall.