改性淀粉聚乳酸共混體系增容方法的研究

1、南開大學(xué)碩士學(xué)位論文改性淀粉聚乳酸共混體系增容方法的研究姓名：趙乃鵬申請學(xué)位級別：碩士專業(yè)：高分子化學(xué)與物理指導(dǎo)教師：張政樸20080501AbstractAbstractPoly(1acticacid)(PLA)isawellknownbiodegradablematerialDuetoitsexcellentmechanicalpropertiesandbiocompatibilityPLAhasbeenextensivelyres

2、earchedandappliedinthefieldofbiomedicine，such弱surgicalsuture，bonefracturefixation，controlledreleaseandtissuerepaiLSinceitspriceishigherthangeneralpurposeplastics，PLAhasnotbeenusedaspackagingmaterialsandmulchfilmInthisthe

3、sis，wenotonlystudiedthedirectpolymerizationofPLA，butalsoinvestigatedtheblendsofPLAandmodifiedstarchonimprovingcompatibilityandprocessingoftheblendsThepolymerizationofPLAwascarriedoutbysolutionpolymerization，whichcouldeff

4、ectivelydispersethesystem，transferthereactionheatandexcludewaterThekeyfactorsofaffectingmoleculeweighthavebeenanalyzedTheoptimalpolymerizationconditionswerethatmachinestirrerdehydratedwithDeanStarktr印andmolecularsieve，th

5、eratioofcatalyst／monomerWas05％，thecatalystWasSnCl2廠rSAcompound(ratioofSnCl2／TSA=I)，thesolventWastolueneandpolymerizationtimeWas16hPLAmoleculeweightWas14526TheresearchontheblendsofPLAandmodifiedstarchfocusedonimprovingcom

6、patibilityofblendsThesolidphaseesterificationbetweenPLAandmodifiedstarchhasbeenresearchedTheresultsweredeterminedbyFTIRandtitrationofcarboxylendgroupDSCandSEMshowedthattheesterificationcouldimprovethecompatibilityofthebl

7、ends，whosemechanicalpropertieswerealsoimprovedEffectsofPLAonimprovemechanicalpropertiesofplasticizingstarchwerestudiedDSCprovedthatesterificationbetweenPLAandplasticizingstarchwasalsoeffectualHoweverprocessingoftheblends

8、Wasdi街cult，sincePLAWassensitivetoheatandstarchdidnotmeltathightemperaturePLAandstarchcouldnotblenduniformitybymeltextrusionPLAdegradedduringwarm—upperiodofinjectionmoldedprocessingBeingshortofprocessingmethod，characteriz