简介:Solidstatenanoporesornanochannelspreparedinpolymer[1;2]andsemiconductorfilms[3]haveshowninterestingtransportphenomena,becauseoftheirdiametersatthenanoscaleandpositiveornegativechargesontheirwalls.Grapheneisanidealmaterialfordevelopingsolidstatenanoporesnotonlyduetoitsatomicscalethickness,highmechanicalstrengthandchemicalstabilitiesbutalsobecauseoftheimpermeabilityofthepristinesinglelayergraphenetoallatomsandmoleculesexceptprotons[4].AsthesingleGraphene/PET(G/PET)nanoporeistheelementarybuildingblockfornanoporousmembrane,theunderstandingandcontrolofitsindividualionictransportpropertiesarealsocrucialinproteinseparation,waterdesalination,andbio-moleculedetectionusingarraysofidenticalnanopores.Here,thesingleG/PETnanoporewassuccessfullypreparedbyusingionirradiationtechnologyandasymmetricetchingmethod[5]andthecorrespondingionictransportpropertieswereinvestigatedindetail.
简介:One-stepreactioncompatibilizedmicrofibrillarreinforcediPP/PETblends(CMRB)weresuccessfullypreparedthrougha'slitextrusion-hotstretching-quenching'process.CrystallizationbehaviorandmorphologyofCMRBweresystematicallyinvestigated.Scanningelectronicmicroscopy(SEM)observationsshowedblurryinterfaceofcompatibilizedcommonblend(CCB).ThecrystallizationbehaviorofneatiPP,CCB,microfibrillarreinforcediPP/PETblend(MRB)andCMRBwasinvestigatedbydifferentialscanningcalorimetry(DSC)andpolarizedopticalmicroscopy(POM).TheincreaseofcrystallizationtemperatureandcrystallizationrateduringnonisothermalcrystallizationprocessindicatedbothPETparticlesandmicrofibrilscouldserveasnucleatingagentsandPETmicrofibrilsexhibitedhigherheterogeneousnucleationability,whichwerealsovividlyrevealedbyresultsofPOM.ComparedwithMRBsample,CMRBsamplehaslowercrystallizationtemperatureduetoexistenceofPETmicrofibrilswithsmalleraspectratioandwiderdistribution.Inaddition,sinceinsitucompatibilizertendstostayintheinterphase,itcouldalsohinderthediffusionofiPPmoleculestothesurfaceofPETphase,leadingtodecreaseofcrystallizationrate.Two-dimensionalwide-angleX-raydiffraction(2D-WAXD)waspreformedtocharacterizethecrystallinestructureofthesamplesbyinjectionmolding,anditwasfoundthatwell-developedPETmicrofibrilscontainedinMRBsamplepromotedformationofβ-phaseofiPP.