Abstract

BRAGA, Fernanda C. F.; OLIVEIRA, Marcia G.  and  FURTADO, Cristina R. G.. Influence from the concentration of interfacial agent on the properties of PP/EPDM/organoclay nanocomposites. Polímeros [online]. 2012, vol.22, n.3, pp. 267-272.  Epub June 05, 2012. ISSN 0104-1428.  http://dx.doi.org/10.1590/S0104-14282012005000033.

In this work, nanocomposites were prepared with PP/EPDM thermoplastic elastomer and organoclay by melt intercalation in an internal mixture chamber. Masterbatches composed of PP-MA/organoclay in proportions of 1:1, 2:1 and 3:1 were prepared and further added to a PP/EPDM thermoplastic elastomer, keeping the clay content fixed at 5% (by weight). The tensile properties, rheology and the morphology (organoclay dispersion, crystalline structure and crystallinity degree) of nanocomposites were studied to establish the influence of the PP-MA/Organoclay ratio in the system. The results showed that the addition of increasing levels of PP-MA improved the dispersion of organoclay in the PP/EPDM matrix. As revealed in x-ray diffraction and confirmed by rheology measurements nanocomposites were obtained with mixed intercalated and exfoliated structures, resulting in higher tensile modulus and elongation at break.

Keywords : Nanocomposite; thermoplastic elastomers; organoclay; PP-MA.