1,721,018 research outputs found
Nanocomposites of PLA and PCL based on montmorillonite and sepiolite
No full textPLA and PCL nanocomposites prepared by adding two organically modified montmorillonites and one sepiolite were obtained by melt blending. Materials were characterized by Wide Angle X-ray analysis (WAXS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and Dynamic-Mechanical Thermal Analysis (DMTA). All clays showed a good dispersion level with both polymeric matrices, whilst the highest thermomechanical improvements were reached depending on type of clay. These improvements were considerably higher in the case of PLA based nanocomposites probably because of a higher polymer/filler compatibilit
Polypropylene-polyhedral oligomeric silsesquioxanes(POSS) nanocomposites
No full textIn this paper, the influence of the functionalisation of polyhedral oligomeric silsesquioxanes (POSS) cages on the preparation and properties of polypropylene (PP) based nanocomposites is studied. POSS with different chain lengths (octamethyl-, octaisobutyl- and octaisooctyl-POSS) are taken in to account and melt mixed with PP. The resulting composites are characterised as regards thermal and morphological characteristics by means of DSC, TGA, SEM and X-ray diffraction. A good dispersion is obtained particularly at low loadings of POSS functionalised with longer organic chains. Important features are recognised as regards the crystallisation behaviour of PP by octamethyl- and octaisobutyl-POSS: The former acting as a nucleating agent and the second inducing PP polymorphism
NANOSTRUCTURE SURFACE INTERACTION WITH POLYMERS: The key factor in nanocomposite preparation
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Metal functionalized POSS as fire retardants in polypropylene
No full textThis paper deals with the study of the combustion properties of dimeric and oligomeric Al-and Zn-isobutyl silsesquioxane (POSS)/polypropylene (PP) composites, in comparison with neat PP and PP/octaisobutyl POSS. The presence of Al-POSS leads to a decrease in combustion rate with respect to PP, resulting in a decrease of Heat Release Rate (−43% at 10 wt% POSS loading) as well as reduction in CO and CO2 production rates, whereas a negative effect on the above parameters is obtained with octaisobutyl POSS. Zn-POSS does not significantly affect the PP combustion behaviour. The effect of Al-POSS is most likely related to its chemical activity, which favours the formation of a moderate amount of char residue, by catalysing secondary reactions in the polymer during combustio
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