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ID:28341595
大小:9.11 MB
页数:113页
时间:2018-12-09
《聚l-乳酸的固相反应与乳酸—亮氨酸二聚体的制备》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、AbstraetAbstract玩avarietyofnaturalPolymerandoynthotic尹01卿e瓦Polylactieaeid(PLA)15themostwidelystudieds”thetiede脚dablepolymer.Notonlybeeause」ofthedegradationProductsofPLAare也enon一toxieWaterandeatbondioxideProducts,butPolylactieaeidhavebetterPer肠二anoean
2、dprocessingProPerties.BecauseofitsSPecialProPerties,therearealotofusing或n橄emedicalandpackagingindustriesnow.AlthoughthePLAaremorewidelyused。伍ePLAitselfhasmanyShorteomings.ForexamplePLAhasahighdegeeofcrystallinity,50伍ebrit妞eness15toolarge;thehighmolec
3、ularweightPolylaeticaeidaresoexPensive;lac?ksofbiologiealactivitygrouPs,thusreducingbiologiealcomPat汤ilityand50on.InordertofurtherexPandtheusingseoPeofPolylaetieaeidandtoimProvePerformanceofPolylacticaeid,modificationofthePLA15ahotresearchinsc,ientis
4、tsinrecentyears.ThisissuefirstusemethodofmeltPol娜erizationtoobtainepol贝actieacid.AndweusesolidPhasePolylnerizationand丫一radiationcrosslinkingmethodstoimProvethemolecularweightofPolylaetieacidatsametimereducethe,CrystallinityofPolylaetieaeid.W亡useamino
5、acidsthatcontainebiologicallyaetivegrouPswithla以icaeidtoeoPol卿erizeinordertomodifyPLA.①Usingstannousoctoate,stannousoctoateandp一toluenesulphonieacidaseatalysttomakethePolylactieaeid,resPectively.UsingPolarizedlightmicroseoPyfoundthatthemoreobviousbal
6、lerystal.TheresultsofDSC,TGthermalanalysisshowthattheinitialdeeomPositiontemPeratureofthes邓thesisofPolylaeticaeid15above260℃,meltingtemPerature15above140oC.②TheuseoflowermoleeularweightofpolylacticaeidbysolidphasePolymerizationtoimProvethemoleeularwe
7、ight.AndresearchthereactiontemPeratureandeatalysteontentonthemoleeularweightofsolidPhasePol卿erization.③Researchthepolylactieaeidofdi月七rent狄ICeontentatlowradiationdosesof丫一Radiationeffeets,andtheresultsshowedthatTAICwithPoly(laetieacid)haveagoodeross一
8、linking,themoleeularweighthasbeensignifieantlyilnProved,andwiththeinereasingofTAIC,PLAerystallinitydeereased.Moreover,withtheinereaseof声‘radiationdose,themolecularweightofPol贝actieaeidfirstincreasedandthendecreased.Inthestudyofthelow:adiationdosewhen
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