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1、河北工业大学硕士学位论文ABSTRACTItisaeffectivemethodforpreparationofhighhydrophobicpolyvinylidenefluoride(PVDF)porousmembranewithroughsubstrateassistedphaseseparationatahighhumidity.Inthispaper,hydrophobicpolyvinylidenefluoride(PVDF)membraneswerefabricatedbyone-stepgelmethodtosimplifythemembranetechnologyandi
2、mprovetheperformaceofmembranebasedonPVDF/N,N-dimethylacetamide/octanol/watersystem.EffectsofsingleorcompositeadditivesofpolymerandnanoparticleonthemorphologyandperformanceofPVDFmembranewereresearched.Firstofall,itwasstudiedthattheeffectsofadditivesonthethermodynamicsandgelkineticsofthecastingsolut
3、ionsystembytheanalysisofthemodynamicpropertiesandthetestofviscosityandgeltestofcastingsolution.Theresultsshowedthatthecontentofadditicvesinthecastingsolutionincreased,thethermodynamicsstabilityofcastingsolutionwillbeworseandphaseseparationwillbestrengthening.Theeffectsoffoursingleadditivessuchaspo
4、lymer,nanoparticles,inorganicsaltsandliquidnon-solvent,onthemembranemorphologyandperformancewereexploredbyscanningelectronicmicroscopy,contactangle,gasflux,mechanicalperformanceandotheranalysismethods.Itwasfoundthatthecross-sectionmacroporousmorophologydevelopedfullyanditisbeneficialtoincreasegasf
5、luxofPVDFmembrane,whilehydrophhobicreducedbecauseofthesmallamountofresidualadditivesinPVDFmembrane.Nanoparticlesadditivesmakedmembranegeneratemorespheruliteonthemembranebottomsurface,anditisbeneficialtomaintainorevenenhancehydrophobicityofmembrane,butthegasfluxdecreased.Inogranicsaltadditivesmaket
6、heroughnessofmembranebottomsurfaceincrease,andthehydrophobic,gasfluxandmechanicalperformancewerebetter.Non-solvenradditivesmakethemembranegenerateacertainthicknessofspherulitestackstructure,itisbeneficialtoincreasethehydrophobicofPVDFmembrane,theoverallperformanceofmembranewithphosphoricacidasaddi
7、tiveswasbest,anditcankeepthehydrophobicpropertyandmechanicalproperties,inthemeantimeimprovedthegasfluxofmembraneobviously.DifferentkindsofadditivescankeepthemechanicalofPVDFmembranewell.Onthebasisoftheabove-menti
