Degradation of polypropylene in naturally and artificially weathered plastic matrix composites

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 degra...

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Autores principales: Fabiyi,James S, McDonald,Armando G
Lenguaje:English
Publicado: Universidad del Bío-Bío 2014
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2014000300002
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spelling oai:scielo:S0718-221X20140003000022014-08-18Degradation of polypropylene in naturally and artificially weathered plastic matrix compositesFabiyi,James SMcDonald,Armando G Crystallinity molecular weight distribution polypropylene weathering wood plastic composites 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. PP’s 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.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.16 n.3 20142014-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2014000300002en
institution Scielo Chile
collection Scielo Chile
language English
topic Crystallinity
molecular weight distribution
polypropylene
weathering
wood plastic composites
spellingShingle Crystallinity
molecular weight distribution
polypropylene
weathering
wood plastic composites
Fabiyi,James S
McDonald,Armando G
Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
description 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. PP’s 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.
author Fabiyi,James S
McDonald,Armando G
author_facet Fabiyi,James S
McDonald,Armando G
author_sort Fabiyi,James S
title Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
title_short Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
title_full Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
title_fullStr Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
title_full_unstemmed Degradation of polypropylene in naturally and artificially weathered plastic matrix composites
title_sort degradation of polypropylene in naturally and artificially weathered plastic matrix composites
publisher Universidad del Bío-Bío
publishDate 2014
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2014000300002
work_keys_str_mv AT fabiyijamess degradationofpolypropyleneinnaturallyandartificiallyweatheredplasticmatrixcomposites
AT mcdonaldarmandog degradationofpolypropyleneinnaturallyandartificiallyweatheredplasticmatrixcomposites
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