Por favor utiliza este link para citar o compartir este documento:
|Título:||DEGRADATION OF POLYPROPYLENE IN NATURALLY AND ARTIFICIALLY WEATHERED PLASTIC MATRIX COMPOSITES|
molecular weight distribution
wood plastic composites
|Editorial:||Universidad del Bío Bío|
|Descripción:||Effects of accelerated and natural weathering on the molecular weight distribution (MWD) and crystallinity of polypropylene (PP) in wood plastic composites (WPC) were investigated. The composites were produced from pine fibers (60%) and PP (40%). Prolonged weathering caused an increase in wood degradation and erosion thereby leaving cracks and pits on the surface. Pyrolysis gas chromatography-mass spectrometry (Py GC-MS) revealed that PP dominated the weathered surface due to wood degradation. For matrix analysis, PP was extracted using 1,2,4-trichlorobenzene. Crystallinity and molecular weight distribution of PP were monitored by differential scanning calorimetry (DSC) and gel permeation chromatography (GPC), respectively. PPs crystallinity increased upon longer exposure time. The weight and number average molecular weight (Mw and Mn) decreased with an increase in weathering duration. An increased polydispersity (PD = Mw/Mn) implies that a secondary cross linking process occurred during weathering.|
|Aparece en las Colecciones:||Maderas. Ciencia y Tecnología|
Archivos de este documento:
No hay archivos asociados a este documento.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.