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Morphology diversity of injection moulded polymer composites

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Author(s): M. Bilewicz | J.C. Viana | A.M. Cunha | L.A. Dobrzański

Journal: Journal of Achievements in Materials and Manufacturing Engineering
ISSN 1734-8412

Volume: 15;
Issue: 1-2;
Start page: 159;
Date: 2006;
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Keywords: Heat treatment | Polymer-polymer composites | Nanocomposites | Non-conventional injection molding | Structure-properties relationships

ABSTRACT
Purpose: This work was performed in the aim of exploring non-conventional injection moulding technique and to study the effect of processing thermomechanical treatment on the morphology and properties of polymer-polymer composites.Design/methodology/approach: Multilayered highly oriented skin regions induced by high shearing of the melt were obtained during non-conventional injection moulding process. Structure development has been observed in the polarized light microscope and by scanning electron microscopy. The fracture energy has been calculated from notched bar specimens.Findings: The processing variables (melt temperature, stroke time and number) are determinant of the fracture energy of the neat PP. Higher setting of these processing variables gives enhanced fracture energy (25% higher). Immiscible polymer blend of PP/PC processed by melt manipulation techniques show improved fracture toughness compared to neat PP. Addition of MAP to PP/PC did not affect the fracture energy for low setting of the processing variables, but significantly decreased it for high adjustments. The fracture energy of nanoclay reinforced PP is the double of the neat PP, for both melt temperature settings. Lower values of fracture energy have been obtained for polymer-polymer composite of PP/PC reinforced with nanoparticles (3-fold lower).Research limitations/implications: Further work contains research of different materials’ ratio, as well different polymer-polymer compositions (e.g., PP/PS and PP/LCP). Other mechanical properties will be assessed.Practical implications: The improvement of mechanical response is sharply apparent by use of SCORIM technique and by the use of nanoparticles reinforcement.Originality/value: This polymer processing technology is promising route for morphology manipulation and improvement on the mechanical properties of polymer systems. Research studies on processing-structure-properties relationships of polymer-polymer composites and nanocomposites moulded by melt manipulation techniques are scarce.

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