Publicação
Evolution of dispersion along the extruder during the manufacture of polymer-organoclay nanocomposites
| Resumo: | 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. |
|---|---|
| Autores principais: | Barbas, J. M. |
| Outros Autores: | Machado, A. V.; Covas, J. A. |
| Assunto: | On-line monitoring Rheology Near-infraredspectroscopy Polymer nanocomposites |
| Ano: | 2013 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | 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. |
|---|