INVESTIGADORES
MARCOVICH norma Esther
capítulos de libros
Título:
Selected Topics on Wood Flour – Polypropylene Composites: Thermal, Mechanical and Time Dependent Response
Autor/es:
MARÍA MARTA REBOREDO; MIRTA INÉS ARANGUREN,; NORMA ESTHER MARCOVICH
Libro:
Polyolefin Composites
Editorial:
John Wiley and Sons, Inc.
Referencias:
Lugar: New Jersey; Año: 2008; p. 150 - 177
Resumen:
The performance of wood flour/polypropylene (PP) composites with modified interfacial compatibilities was analyzed. Wood flour modification was performed by esterification with maleic anhydride; alternatively a non-commercial maleic anhydride-polypropylene copolymer (MAPP) was selected as compatibilizing agent. Dynamic mechanical studies suggested that the overall performance of maleic anhydride treated wood flour composites was lower than that of the composites containing MAPP. Besides, the thermal degradation of treated wood flour and corresponding composites occurs at lower temperature than that of untreated wood flour samples. The tensile and bending moduli increase with the addition of filler, this increment being more important if treated wood flour was used or if MAPP was added to the composite. Additionally, composites showed increased impact strength at low wood flour concentrations. However, as filler concentration was increased the material became more rigid and the impact energy dropped. Short-term and long-term creep tests of composites at different temperatures were carried out and analyzed. The effect of filler content, compatibilizing agent and temperature on the material response was discussed. The creep deformation was generally reduced by wood flour addition, and even more with the addition of MAPP. Attempts to use the time temperature superposition principle to predict long-term creep from high temperature results were not successful due to the ageing of the samples during creep at low temperatures.