The role of oleate-functionalized layered double hydroxide in the melt compounding of polypropylene nanocomposites

0380812 - ÚMCH 2013 RIV NL eng J - Článek v odborném periodiku
Donato, R. K. - Luza, L. - da Silva, R. F. - Moro, C. C. - Guzatto, R. - Samios, D. - Matějka, Libor - Dimzoski, Bojan - Amico, S. C. - Schrekker, H. S.
The role of oleate-functionalized layered double hydroxide in the melt compounding of polypropylene nanocomposites.
Materials Science & Engineering C-Materials for Biological Applications. Roč. 32, č. 8 (2012), s. 2396-2403. ISSN 0928-4931. E-ISSN 1873-0191
Výzkumný záměr: CEZ:AV0Z40500505
Klíčová slova: renewable feedstock functionalized nanofiller * polymer-matrix nanocomposite * melt compounding
Kód oboru RIV: CD - Makromolekulární chemie
Impakt faktor: 2.404, rok: 2012

In this research, the oleate-functionalized magnesium and aluminum layered double hydroxide (LDH; Mg: Al=3:1) o-LDH was applied as nanofiller in the melt blending of polypropylene (PP) nanocomposites, in order to understand its role in this process. o-LDH was prepared using the memory effect of the calcined carbonated LDH. Blending of PP and low o-LDH filler contents of 0.45 and 0.90 wt. % afforded the nanocomposites PP0.45 and PP0.90, respectively, which were characterized by transmission electron microscopy, X-ray diffraction, small angle X-ray scattering, thermo-gravimetric analysis, differential scanning calorimetry and dynamic mechanical analysis. The oleate LDH surface functionalization enhanced the system compatibility as a relative regular dispersion of o-LDH tactoids was observed within the matrix, together with partial PP intercalation. This o-LDH incorporation increased the PP relative crystallinity, induced crystalline orientation and decreased the glass transition temperature. Furthermore, the nanocomposites showed improved initial resistance to decomposition and stiffness. These results showed that the o-LDH acted as both nucleating agent and plasticizer, and that the presented approach can be used for the development of PP nanocomposites with distinguished properties.
Trvalý link: http://hdl.handle.net/11104/0211425