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 |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S0009250913003254-main.pdf Acesso restrito! | 2,33 MB | Adobe PDF | Ver/Abrir |