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vol.34 número1ESTUDIO DE LA MICROESTRUCTURA DE COPOLÍMEROS DE METIL-N-HEXADECIL ITACONATO CON ESTIRENOEFECTO DE LA CALCINACIÓN DE HIDROCALUMITAS COMO SOPORTE DE CATALIZADORES SOBRE LA REACCIÓN DE HIDRODESULFURACIÓN DE TIOFENO índice de autoresíndice de materiabúsqueda de artículos
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Revista Latinoamericana de Metalurgia y Materiales

versión impresa ISSN 0255-6952

Resumen

ROSALES, Carmen et al. STUDY OF BLENDS OF POLY (LACTI ACID) WITH POLYPROPYLENE AND NANOCOMPOSITES WITH MONTMORILLONITE. Rev. LatinAm. Metal. Mater. [online]. 2014, vol.34, n.1, pp.158-171. ISSN 0255-6952.

In the present work, the influence of degradation during the processing in the tensile properties of blends of poly (lactic acid), montmorillonite and two types of polyolefins as dispersed phases was studied. Polymers grafted with maleic anhydride were employed as the compatibilizing agents. The nanocomposites and their blends were prepared in an internal mixer at 200°C and characterized using solution viscometry of the PLA phase, infrared spectroscopy (FTIR) and transmission and scanning electron microscopy (TEM and SEM). The melt processing of the PLA produced its thermo-mechanical degradation and a steep decrease in its molecular weight. The large size of the dispersed phases in the PLA and the poor tensile properties of the blends without clay were attributed to the thermal degradation of the PLA matrix during their processing. Changes in the molecular weight of the PLA in blends without montmorillonite depend on the type of disperse phase and on the efficiency as emulsifier of the compatibilizing agent employed. The presence of montmorillonite slightly increased the Young’s modulus values of the blends. Smaller particle sizes of the dispersed phase were found in blends with the clay; however, optimal tensile properties were not found.

Palabras clave : poly(lactic acid) blends; polypropylene; poly(lactic acid) nanocomposites; montmorillonite; compatibilizer agent..

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