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Revista Técnica de la Facultad de Ingeniería Universidad del Zulia
versión impresa ISSN 0254-0770
Resumen
ROSALES, Carmen et al. Effects of degradation during the processing on morphology and tensile properties of nanocomposites blends of poly (lacti acid) with polyethylene. Rev. Téc. Ing. Univ. Zulia [online]. 2014, vol.37, n.2, pp.135-143. ISSN 0254-0770.
In the present work, the influence of the degradation during the processing of nanocomposites of poly (lactic acid) (PLA) with montmorillonite and its blends with low density polyethylene as dispersed phase on their morphology and tensile properties was studied. Polymers grafted with maleic anhydride were used as compatibilizer agents. The blends were prepared via melt blending in an internal mixer at 200°C and characterized in terms of solution viscometry of the PLA phase, infrared spectroscopy, and scanning and transmission electron microscopy. Results showed that the processing of PLA produced thermo-mechanical degradation in the polymer and a significant decrease in the viscosity molecular weight of the PLA phase in the different composites. The large sizes of the dispersed phases in the unfilled PLA blends and the low values of the tensile properties could be attributed to the thermo-mechanical degradation of the PLA matrix during its processing. The blends with PLA as matrix and PEBD as dispersed phase exhibited the highest elongation at break. Lower values in tensile properties were obtained in the blend with montmorillonite than those obtained for the blend without the layered clay due probably to the degradation during the processing and also to their morphology.
Palabras clave : poly (lactic acid) blends; polyolefins; poli (lactic acid) nanocomposites; montmorillonite; tensile properties.