異氰酸酯與淀粉反應及其封閉研究.pdf

1、華中科技大學碩士學位論文異氰酸酯與淀粉反應及其封閉研究姓名：田鋒利申請學位級別：碩士專業(yè)：高分子化學與物理指導教師：楊濟活20090528華中科技大學碩士學位論文華中科技大學碩士學位論文IIAbstractSecondonlytocellulosestarchisarenewableresourceitisverycheapbiodegradable.Itcanbeeasychangedintostarchderivatives.Peo

2、plehaveattachedgreatimptancetothedevelopmentutilizationofstarchresourcesfalongtime.Ourlabatyhaspreparedstarchbasedwoodadhesivesbasedonpreviousstudybutthewaterresistancestrengthcannotmeetthepracticalapplicationrequirement

3、s.Thepurposeofthispaperistoresolvetheproblemofwaterresistancestrengthofstarchadhesives.TDIreactedwithstarchthenweblockeditsproducts.Weusethisblockedproductsascrosslinkerinstarchbasedwoodadhesives.Thisideaisofgreatinnovat

4、ion.StarchTDIwasusedasrawmaterialstostudythereactionofTDIstarchthereactionmechanism.ModifiedstarchwithNCOgroupswassynthesized.ThestudyfocusedonthedifferentfactsonthereactionofTDIstarch.Throughthedibutylaminetitrationwean

5、alyzedthecontentofresidual–NCO.Wehavefilteredoutthebestreactionconditions:ThebestreactionsolventisethylacetatesolventthebestweightratioofstarchTDIis3:2thebestreactiontemperatureis80℃thereactiontimeis6hours.Weusedofthefou

6、riertransfminfraredspectrometer(FTIS)toanalyzeacterizetheproducts.TheresultsshowthattheOHinstarchcanreactwiththeNCOinTDIeffectively.TheconversionrateofTDIvariesindifferentconditions.Solventimpactsverysignificantontheconv

7、ersionrateoftheTDI.Instrongpolarsolvents（fexample:DMF）boththetwo–NCOgroupsreactedwithstarchcrosslinkingreactionoccurredbetweensomestarchmolecules.Sotheviscosityofproductsweretoolargewithoutanypracticalvalue.Theappropriat

8、esolventisethylacetatewiththeconversionrateof57.5percent.NaHSO3wasusedtoblocktheNCOinmodifiedstarchtheinfactwhichinfluencetheblockingreactionwasresearched.Iodinetitrationwasusedtoanalyzetheblockingrate.Optimumconditionwa