《纳米纤维素》ppt课件

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IntroductionofWood-relatedMaterialsResearchinEdinburghNapierUniversity6/29/2021CanTreesTransformOurLife 6/29/2021Page2 ForestProductsResearchInstituteOneofthenineinstitutesinEdinburghNapierUniversityWorkofexistingCentreforTimberEngineeringseparatedandnewinstituteestablishedin2010IncludesfourspecialistresearchcentresVariousresourcesfundingprojects(Scottishgovernment,EdinburghNapierUniversity,industrialcompaniesetc)6/29/2021Page3 CentresinFPRITwocentresfocusondesignandconstructionofwoodproductsTheWoodStudioCentreforTimberEngineeringTwocentresdealwithwood-relatedmaterialsscienceandchemistryresearchCentreforPlantScienceandBiopolymerResearchCentreforWoodScienceandTechnology6/29/2021Page4 NanocelluloseProjectCollaborativeresearchprojectbetweenNapierandSappiFabricationofcellulosenanofibrilsfrompulpsUtilisingcellulosenanofibrils(in-houseandexternal)tomakehighstrengthfibresScaleuptheprocesstoaindustriallevel6/29/2021Page5 NanocelluloseProject6/29/2021Page6FinePaper(Graphics)Speciality–ReleasePaper StructureofCelluloseFibres6/29/2021Page7 ProcessingofNanoCelluloseMechanicalprocessAcidhydrolysisPurification(removalofunusedstuffandpurifytheremaining)Dialysisprocess(adjustpHofcellulosesuspension)(Optional)Counterions(inordertoadjustsurfacecharge)ConcentrationMixingGelstorage(agingeffect)6/29/2021Page8 CellulosePowder(MechanicalProcess)6/29/2021Page9PulpshredderShreddedPulpBallMilling250µmwiremeshFilterCellulosePowder 6/29/2021Page10CentrifugeCentrifugetoremoveacidandwasteDialysis3-5daystoremovesulphuricacidandincreasepH 6/29/2021Page11Centrifugewillbeusedsubsequentlytoadjustzetapotential(counterions)Theconcentrationofthesamplewillbeincreased(gel)Rollmillwillbeusedtofurthermixthegelaftercentrifugation/concentrationtoreducethedomainsizeandincreasehomogeneityThegelsamplesarestoredinfalcontubeinfridges Cellulosegels6/29/2021Page12 6/29/2021Page13ChiralNematicdomainsAimtoalignparticlesunderflowExperimentdesignedtostudyalignmentandultimatelyprocessfibreswithsimilarpropertiesFibreSpinningProcess Fabricationofcellulosefibresusingdryspinningprocess6/29/2021Page14GelPistonDie/SpinneretAttachmentPressureTransducerHyperbolicDieCapillaryDie 6/29/2021Page15 6/29/2021Page16Re-checkedat16.7cN/texProjectTarget≥150cN/texIntermediateTarget100cN/texLyocell40cN/texCommercialViscose20-25cN/texLowtenacityvalues 6/29/2021Page17LyocellMeasuredat36.5cN/texMeasuredat6cN/texMulticoloureddomainsUniformBlueColourSpunFibreundercross-polarisedmicroscope FlowCellTest6/29/2021Page18HyperbolicDieCapillaryDie 6/29/2021Page196mm/min18mm/min27mm/min54mm/min91mm/min182mm/minGelSampleat18.44%solidsandnocounterionDarkeninginflowchannelasmoleculesalign Modification/ImprovementoftheprocessNewflowcelldesignforhightemperaturetestMulti-spinneretdiedesign(newdryinganddrawdownmechanism)Anewdiafiltrationsystem(allinonesystemtoreplacehydrolysis-dialysis-purification-concentrationprocess)Anewteamofchemistsrecentlyformedtoresearchonchemicaltreatmentofcellulosegels6/29/2021Page20 NewDiafiltrationSystem6/29/2021Page21ROwaterHydrolysisProductTankFilterPMgCO3/Na2CO3NeutralisationCylinderDumpTankDrainRetentatePermeateFlowRotameterFlowRotameter 29/06/2021Page22