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,,,,(,,230039):(LA),,,(PLA)..,,.,:(0.5wt%),175,12h,30Pa;:(0.5wt%)60Pa15010h.:;;;;:TQO5O:A:1000-2162(2008)06-0078-04(PLA),.(CO2H2O),,[1].,,,[2],[3].,.11.1(85wt%),AR,;,AR,;(T-9),AR,;,(99%),AR,.2XZ-2();DGZ2014-I();(0.38mm);.1.2(85wt%)250mL,N2,1002h.135,[5];170180,30Pa,,1h.812h,,,,,.,5024h,,.,12013014015015516010h..1.31.3.13h,,20.1%:2008-04-28:(2006jql031);:(1974-),,,,.200811326()JournalofAnhuiUniversityNaturalScienceEditionNovember2008Vol.32No.6,0.1molL-1KOH,,15s.=(V-V)N56.1W100%,V:KOH;V:KOH;N:KOH;W:(g).1.3.2PLA(250.1),.[]=KM,:[],K=5.510-2,=0.639[4].1.3.3FT-IRNICOLETNEXCU-870,KBr,5004000cm-1.22.1,,.,.1,2962cm-1CH;1385cm-1CH3;1734cm-1CO;1166cm-1.,[5].2,1759cm-1,CO,3506cm-1PLAOH,2962cm-11456cm-1CH3,2948cm-11363cm-1CH,1213cm-11134cm-11093cm-1COC,,.122.32.3.1,();,.FDA,,.,.0.5wt%,;0.5wt%,.,0.5%.2.3.2,,,.,,,,.2.3.3,;,.,,976,:;,,,,.3,,;175,.;,,,.,175.2.3.4,,,;,,.4,12h,.,N2,.N2,,,;N2,.(0.5wt%),17512h30Pa,.3:0.5wt%,8h,30Pa4:0.5wt%,175,30Pa5:0.5wt%,10h,60Pa2.4,PLA.,5[5-6].,.10h,.5,,;,,.150,PLA,150,.3(1),,,,.(0.5wt%),175,12h30Pa,.(2),,60Pa,150,10h,9000.,-,.08()32:[1]KricheldorfHR.Synthesesandapplicationofpolylactides[J].Chemosphere,2001,43:49-54.[2],,,.[J].:,2005,44(3):67-70.[3]ErbaRD,GroeninckxG,MaglioG,etal.Immisciblepolymerblendsofsemicrystallinebiocompatiblecomponents:thermalpropertiesandphasemorphologyanalysisofPLLA/PCLblends[J].Polymer,2001,42:7831-7840.[4]VandijkJAPP,SmitJAM,KohnFE,etal.Characterizationofpoly(D,L-lacticacid)bygelpermeationchromatography[J].JPolymSci:PolymChemEd,1983,21:197-208.[5]MoonSI,LeeCW,TaniguchiI,etal.Melt/solidpolycondensationofL-lacticacid:Analternativeroutetopoly(L-lactic)withhighmolecularweight[J].Polymer,2001,42:5059-5062.[6],,,.-[J].,2002,20(3):403-406.SynthesisandcharacterizationofbiodegradablematerialPLAZHANGJian2an,WUMing2yuan,WUQing2yun,YANGJian2jun,CHENGJie(CollegeofChemistryandChemicalEngineering,AnhuiUniversity,Hefei230039,China)Abstract:Thedirectmeltingpolycondensationmethodsalongwiththeimprovedprocessofcatalysts,dehydration,nitrogenandvacuumpressurewereadoptedtosynthesizethebiodegradablematerialofpoly(lacticacid)(PLA)fromlacticacid.Thepolymerizationprocesswasmonitoredbychemicaltitrationandthemolecularweightwasmeasuredbyviscositymethod.TheresultantPLAwascharacterizedbyFT2IR.Theinfluencesofpolymerizationtime,temperatureandvacuumpressureontheviscositymolecularweightsofPLAwerediscussed.Theoptimumreactionconditionsfordirectmeltingpolycondensationmethodwere:0.5wt%stannousoctoateascatalyst,polymerizationtime12hat175andvacuumdegree30Pa.Theoptimumreactionconditionsforsolid2phasepolycondensationwere:0.5wt%stannousoctoateascatalyst,polymerizationtime10hat150andvacuumdegree60Pa.Keywords:biodegradablematerial;PLA;directmeltingpolycondensation;solid2phasepolycondensation;viscosityaveragemolecularweight:,186,: