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Sanporean C.-G.,University of Aalborg | Donescu D.,National Research and Developement Institute for Chemistry and Petrochemistry ICECHIM | Vuluga Z.,National Research and Developement Institute for Chemistry and Petrochemistry ICECHIM | Christiansen J.D.,University of Aalborg | And 2 more authors.
UPB Scientific Bulletin, Series B: Chemistry and Materials Science | Year: 2013

The influence of Clay concentration and of two compatibilizers system use was investigated from mechanical point of view. Cloisite-Na Clay was organically modified with a polyethermonoamine and, as second compatibilizer, the maleated polypropylene (MA-PP) or maleated styrene-ethylene-buthylene-styrene (MA-SEBS) were added. Polypropylene nanocomposites with increased crystalline phase and lamellar thickness were obtained. The nanocomposites with MA-PP showed an overall improvement in mechanical properties, especially in tensile strength, creep strain and cyclic test, while those with MA-SEBS presented an improvement in neck propagation, as well as an increase in ductility.


Sanporean C.G.,University of Aalborg | Vuluga Z.,National Research and Developement Institute for Chemistry and Petrochemistry ICECHIM | Christiansen J.D.,University of Aalborg | Radovici C.,National Research and Developement Institute for Chemistry and Petrochemistry ICECHIM | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2013

Nanocomposites of polypropylene with organically modified clay were obtained on a corotating extruder. The modification of clay was done by swelling with a polyetherdiamine which undergoes cross-linking reaction with maleated polypropylene. The effect of clay concentration and of thermal treatment was studied from a morphological and mechanical point of view. The structure was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and dynamic-mechanical thermal analyses (DMTA). Nanocomposites with 1 and 2 wt-% silicate concentration presented improvement in mechanical properties. The improvements observed were: 20% increase in tensile strength, 21% increase in Young modulus, 34% reduction in creep strain and 30% decrease in tensile strain after cyclic loading, meaning improved fatigue. © 2013 American Chemical Society.

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