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1、江南大學(xué)碩士學(xué)位論文聚乳酸聚乙烯醇靜電紡復(fù)合納米纖維姓名:劉亞申請學(xué)位級別:碩士專業(yè):紡織工程指導(dǎo)教師:魏取福20080601AbstractAbstractTitle:PLLA/PVACompositeNanofibersbyElectrospinningMastername:LiuYaSupervisorsname:WeiQufuMajor:TextileEngineeringAsanewkindofenvironmentprote

2、ctionmaterials,poly(Llacticacid)(PLLA)hasawideapplicationinmedicine,industrynationalprotection,etal,especialllywhenitiscombinedwiththetechnologyofelectrospinningButthepoorhydrophilicitylowspeedofdegradationhaveabadeffect

3、onitsapplicationInthisarticle,poly(vinlyalcoh01)(PVA)wasusedtoimprovePLLAPLLA/PVAblendedorcompositemicro/nanofiberswerepreparedbythemeansofelectrospinningThespinningeffectandfibers’propertieswereanalyzedbyapparatusesFirs

4、tlyPLLA/PVAcompositenanofiberswerepreparedwiththeselfassembledelectrospinningequipmentinwhichtwokindsofsolutionswereblendedasthespinningsolutionThepropertechnicalparameters。whichweredeterminedbyvideozoommicroscopeandatom

5、icforcemicroscope(AFM),wereasfollows:14%/6%oftheconcentrationratio0fPLLA/PVA,12kVofthespinningvoltage,05mL/hoftheextrudingspeed18cmofthecollectingdistanceWellshapedfiberswereobminedwiththeseparametersSomechemicalinteract

6、ionbetweenPLLAandPVAi11theblendedfiberhadbeenprovedbyinfraredspectrum(IR)TheincompatibilityofPLLAandPVAinthenanofiberswasobservedusingtappingandphasemodesofAFMButthereweregreatdifferencesamongnanofiberspreparedi11differe

7、nttimeMoredropletsandbeadsappearedinthelattercaseItmaybecausedbythechangeofenvironmentandmaterialpropertiesBecauseoftheunstabilityofthespinningresultiteouldn’trepeated,otherpreparationmethodofPLLA/PVAcompositenanofibersw

8、astakenAtwinspinneretelectrospinningequipment,whichhadtwosetsofsolutionextrudingdevicesandhighvoltagepowersuppliesandarollerasthecocollectingdevice,wassetupandthePLLA/PVAcompositemicro/nanofibershadbeenpreparedwithtwokin

9、dsofsolutionsspinningseparatedlyAfteranalyzingtheimagesofvideozoommicroscopeandscanningelectronmicroscope(SEM),themostsuitabletechnicalparameterswerelistedasfollows:PLLAsolution,concentration30%,voltage15kVextrudingspeed

10、10,08,05,02mL/h,collectingdistance15era;PVAsolutionconcentration10%,voltage18kVextrudingspeed02mL/kcollectingdistance15cm;rotatingspeedoftheroller200r/minAndthestructure,diameterdistributionandsurfaceroughnessofnanofiber

11、swereanalyzedbySEMandAFMThemechanicalpropertyofcompositenanofibermatswasanalyzedbytensiontestandforcedistancecurvesPLLA10mL/hshowedthebestmechanicalpropertyandPLLAO5mL/hwastheworstPLLAgotabetteradhesiveabilitythanPVAdidC

12、ompositenanofibermatshadagreatimprovementonthewettabilitycomparingwiththepurePLLAnanofiberm鞏whichwasprovedbyt11etestsofstaticcontactangleanddynamicwateradsorptionPLLAO2mL/hwasthebestSomeimprovementsonthethermalstabilityo

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