Evolution of dispersion along the extruder during the manufacture of polymer-organoclay nanocomposites

doi:10.1016/j.ces.2013.05.004

Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/26837

Título:	Evolution of dispersion along the extruder during the manufacture of polymer-organoclay nanocomposites
Autor(es):	Barbas, J. M. Machado, A. V. Covas, J. A.
Palavras-chave:	On-line monitoring Rheology Near-infraredspectroscopy Polymer nanocomposites
Data:	2013
Editora:	Elsevier 1
Revista:	Chemical Engineering Science
Resumo(s):	Although correlationsbetweenthe final dispersionleveloforganoclaynanocompositesandmeltmixing conditions inatwinscrewextruderhavebeenproposed,theactuallengthwiseevolutionofdispersionin these machinesisstillnotwellunderstood.Despitetheirpracticalimportancesuchstudiesaredifficult, due tothepossibilityofinducingdegradationand/ormorphologychangesduringmaterialcollection and/or samplepreparation.Thisworkuseson-linerheometryandin-linenear-infraredspectroscopy (NIR) tomonitortheevolutionofdispersionofaPP/PP-g-MA/organoclaysystemalongtheaxisoftwin screwextruder.Regardlessofthescrewprofile utilised,dispersiondevelopsquicklyinthe first partofthe machine, andthenitlevels-offordecreases,evenifthe final dispersionlevelsaresignificant. Inorderto validatethisdata,ScanningTransmittedElectronMicroscopy(STEM),X-raydiffraction(XRD)andmid- FT-IRanalysesarecarriedoutonsamplescollectedfromthesamelocationswheretheon-line/in-line measurements wereperformed.Theresultsconfirmed thepreviousmeasurements.Thermogravimetric analysis(TGA)andTimeofFlight-SecondaryIonMassSpectrometry(TOF-SIMS)onclay,matrixand nanocomposite showedthatthermaldegradationoftheclaysurfactantandofthepolymermatrixcould contribute totheobserveddispersionreversal.
Tipo:	Artigo
URI:	https://hdl.handle.net/1822/26837
DOI:	10.1016/j.ces.2013.05.004
ISSN:	0009-2509
Versão da editora:	http://www.journals.elsevier.com/
Arbitragem científica:	yes
Acesso:	Acesso restrito UMinho
Aparece nas coleções:	IPC - Artigos em revistas científicas internacionais com arbitragem