【材料学论文】聚乳酸的合成及其纤维制造（精彩论文，免费分享！）

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1、聚乳酸的合成及其纤维制造摘要本文详细研究了丙交酯的制备方法，探索了脱水温度、脱水时间、解聚温度、催化剂用量及种类对丙交酯产率的影响；寻找出适合的溶剂对丙交酯进行提纯；最后以精制的丙交酯为原料，研究了反应温度、时间、催化剂用量对丙交酯聚合所得聚乳酸分子量的影响。得出最佳的合成条件和工艺过程；催化剂为辛酸亚锡、催化剂用量为1％、脱水温度为120℃、脱水时间为4h、裂化温度为240℃。并以丙交酯为原料得出最佳的合成条件：反应温度180℃、反应时间24h、催化剂为辛酸亚锡、催化剂用量0.1％、抗氧化剂用量0.21％。文章还对进口切片对聚乳酸的熔融纺丝工艺和聚乳

2、酸纤维降解的影响进行了探索，为聚乳酸生产和应用提供了一些依据。关键词：丙交酯聚乳酸熔融纺丝拉伸降解1Thesynthesisandfiberformationofpolylacticacidabstractwestudiedthesynthesisoflactideinthisthesis.Theinfluencesoftemperature,timeofdehydration,temperatureofdepolymerization,quantityofcatalystontheyieldoflactidewerediscussed.Theopti

3、malsyntheticconditionandprocessengineeringweredrawultimately.Theoptimaldehydrationtemperatureis120℃,dehydrationtimeis4hours,depolymerizationtemperatureis240℃,catalystisSn(Oct)2,quantityofcatalystis1％.ThensynthesisofPLAusedlactideasmaterial.Theinfluencesofquantityofcatalyst,tempe

4、rature,timeofpolymerizationonthemolecularweightoflactidewerealsodiscussed.Theoptimaltemperatureofpolymerizationis180℃,timeofpolymerizationis24hours,catalystisSn(Oct)2,quantityofcatalystis0.1％.Inthisthesis,two-stepmethodprocess(melt-spinningandhot-draw)ofPLAandthedegradabileprope

5、rtiesofPLAfiberwerestudied,whichprovidedsomeevidenceforpreparationandapplianceofPLA.Keyword:LactidePLAMelt-spinningHot-drawBiodegradation2目录前言.........................................................................................................................................

6、..................................1第一章文献综述.......................................................................................................................................................21.1生物降解高分子材料概况.......................................................................

7、...................................................21.2生物降解高分子材料的降解机理和研究方向..........................................................................................41.3聚乳酸的性质.........................................................................................................

8、.....................................61.4聚乳酸的制备