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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Universidad del Bío-Bío
2014
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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 |
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Scielo Chile |
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Scielo Chile |
language |
English |
topic |
Crystallinity molecular weight distribution polypropylene weathering wood plastic composites |
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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 |
_version_ |
1714202580264943616 |