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Pages P.,Polytechnic University of Catalonia | Carrasco F.,University of Girona | Gamez-Perez J.,Center Catala Del Plastic | Santana O.O.,Center Catala Del Plastic | Maspoch M.L.,Center Catala Del Plastic
Afinidad | Year: 2010

The variation of physical and chemical structure induced by processing of PLA and PLA/montmorillonite nanocomposites in a pilot plant has been analyzed in this paper. The degree of crystallinity has been evaluated by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and FTIR spectroscopy. It was found that mechanical processing led to a quasi disappearance of PLA crystal structure, whereas it was recovered after annealing. FTIR spectroscopy has allowed to detect chemical interactions between components in nanocomposites. The thermal stability of the various materials (PLA and its nanocomposites) has been established by calculating various characteristic decomposition temperatures, as determined from TGA thermograms.

Meli G.,Imerys | Abler C.,Imerys | Jouffret F.,Imerys | Antunes M.,Center Catala del Plastic | And 3 more authors.
Society of Plastics Engineers - 10th International Conference on Foam Materials and Technology, FOAMS 2012 | Year: 2012

The research consisted in evaluating the nucleation efficiency of different types of talc (with different particle size distributions, morphologies and even surface modifications) in the foaming behavior and cellular structure of polypropylene-based materials, with the objective of developing lightweight materials with improved stiffness at lower densities. Nucleation efficiency was first evaluated in talc filled PP foamed with a physical blowing agent inside a high pressure vessel Depending on different talc characteristics, such as particle size distribution, surface area and morphology, cell density as much as doubled. Optimized foamed PP-talc composites prepared by injection-moulding using the MuCell^ process displayed further weight reductions for similar stiffness values.

Gomez-Gomez F.J.,University of Guadalajara | Arencon D.,Center Catala del Plastic | Sanchez-Soto M.A.,Center Catala del Plastic | Martinez A.B.,Center Catala del Plastic
Journal of Cellular Plastics | Year: 2013

Microcellular injection moulding is capable of producing lightweight polymeric products. The present study analyses the influence of several representative injection moulding parameters on the foam's morphology, apparent density and thermo-mechanical properties of PETG, poly(ethylene terephthalate-co-1,4-cyclohexylene-dimethylene terephthalate) specimens. A strong variation of the cell morphology along the melt flow direction has been found, as well as a dependence on the shot volume. The most homogeneous microcellular structure is achieved when low shot volume, intermediate injection speed and low mould temperature are employed. The skin-core structure of the injected parts, determined the thermo-mechanical features of the specimen, which are ruled by the skin layer. © 2012 The Author(s).

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