TY - JOUR
T1 - Structure-property relationships in isotactic polypropylene/multi-walled carbon nanotubes nanocomposites
AU - Logakis, E.
AU - Pollatos, E.
AU - Pandis, Ch
AU - Peoglos, V.
AU - Zuburtikudis, I.
AU - Delides, C. G.
AU - Vatalis, A.
AU - Gjoka, M.
AU - Syskakis, E.
AU - Viras, K.
AU - Pissis, P.
N1 - Funding Information:
This work has been funded by the project PENED 2003. The project is cofinanced 75% of public expenditure through EC – European Social Fund , 25% of public expenditure through Ministry of Development – General Secretariat of Research and Technology and through private sector, under measure 8.3 of OPERATIONAL PROGRAMME “COMPETITIVENESS” in the 3rd Community Support Programme.
PY - 2010/2
Y1 - 2010/2
N2 - In this work, the influence of multi-walled carbon nanotubes (MWCNT) on electrical, thermal and mechanical properties of CNT reinforced isotactic polypropylene (iPP) nanocomposites is studied. The composites were obtained by diluting a masterbatch of 20 wt.% MWCNT with a low viscous iPP, using melt mixing. The morphology of the prepared samples was examined through SEM, Raman and XRD measurements. The effect of MWCNT addition on the thermal transitions of the iPP was investigated by differential scanning calorimetry (DSC) measurements. Significant changes are reported in the crystallization behavior of the matrix on addition of carbon nanotubes: increase of the degree of crystallinity, as well as appearance of a new crystallization peak (owing to trans-crystallinity). Dynamic mechanical analysis (DMA) studies revealed an enhancement of the storage modulus, in the glassy state, up to 86%. Furthermore, broadband dielectric relaxation spectroscopy (DRS) was employed to study the electrical and dielectric properties of the nanocomposites. The electrical percolation threshold was calculated 0.6-0.7 vol.% MWCNT from both dc conductivity and dielectric constant values. This value is lower than previous mentioned ones in literature in similar systems. In conclusion, this works provides a simple and quick way for the preparation of PP/MWCNT nanocomposites with low electrical percolation threshold and significantly enhanced mechanical properties.
AB - In this work, the influence of multi-walled carbon nanotubes (MWCNT) on electrical, thermal and mechanical properties of CNT reinforced isotactic polypropylene (iPP) nanocomposites is studied. The composites were obtained by diluting a masterbatch of 20 wt.% MWCNT with a low viscous iPP, using melt mixing. The morphology of the prepared samples was examined through SEM, Raman and XRD measurements. The effect of MWCNT addition on the thermal transitions of the iPP was investigated by differential scanning calorimetry (DSC) measurements. Significant changes are reported in the crystallization behavior of the matrix on addition of carbon nanotubes: increase of the degree of crystallinity, as well as appearance of a new crystallization peak (owing to trans-crystallinity). Dynamic mechanical analysis (DMA) studies revealed an enhancement of the storage modulus, in the glassy state, up to 86%. Furthermore, broadband dielectric relaxation spectroscopy (DRS) was employed to study the electrical and dielectric properties of the nanocomposites. The electrical percolation threshold was calculated 0.6-0.7 vol.% MWCNT from both dc conductivity and dielectric constant values. This value is lower than previous mentioned ones in literature in similar systems. In conclusion, this works provides a simple and quick way for the preparation of PP/MWCNT nanocomposites with low electrical percolation threshold and significantly enhanced mechanical properties.
KW - A. Carbon nanotubes
KW - A. Nanocomposites
KW - B. Electrical properties
KW - B. Thermomechanical properties
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U2 - 10.1016/j.compscitech.2009.10.023
DO - 10.1016/j.compscitech.2009.10.023
M3 - Article
AN - SCOPUS:72949107122
SN - 0266-3538
VL - 70
SP - 328
EP - 335
JO - Composites Science and Technology
JF - Composites Science and Technology
IS - 2
ER -