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Dispersion of carbon nanotubes in poly(lactic acid)
Covas, J. A.; Novais, R. M.; Paiva, M. C.Carbon nanotubes (CNT) grow as entangled bundles that are difficult to disperse in polymer matrices, or even in solvents. However, their dispersion level in the polymer matrix strongly affects the final nanocomposite properties1. Previous studies have shown that filler dispersion can be assisted by the functionalization of the CNTs2. In the present work, CNTs were chemically functionalized to bond pyrrolidine g...
A comparative study of the dispersion of carbon nanofibres in polymer melts
Covas, J. A.; Novais, R. M.; Paiva, M. C.The dispersion of carbon nanofibres (CNF) in a polymer matrix using two melt mixing methods is studied. Distributive and dispersive mixing were evaluated by optical and electron microscopy. The CNF were chemically modified to improve the interface with the matrix. The results showed that the two methods produced good distribution of the filler, but extensional stresses induced higher dispersion. The latter corr...
Dispersion of carbon nanotubes in poly(lactic acid)
Novais, R. M.; Paiva, M. C.; Covas, J. A.Carbon nanotubes (CNT) present excellent mechanical, electrical and thermal properties, and are expected to impart these properties into their composites. However, the CNT are grown as entangled bundles that are difficult to disperse in polymer matrices, or even in solvents. Several approaches have been tried for the efficient dispersion of CNT in polymer matrices, ranging from the CNT chemical modification to ...
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