A Simple, Convenient and Approachable Strategy of hemistry for the Surface Modification of Paper Derived Cellulose-中国聚合物网,论文下载

A Simple, Convenient and Approachable Strategy of hemistry for the Surface Modification of Paper Derived Cellulose

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Polysaccharidesarelongcarbohydratemoleculesofmonosaccharideunitsjoinedtogetherbyglycosidicbonds.Theyrangeinstructurefromlineartohighlybranch.Polysaccharidesareoftenquiteheterogeneous,containingslightmodificationsoftherepeatingunit.Polysaccharidesareconsideredaspotentialcandidatesforeco-materials‘,sincetheyarebiodegradable.Bythevirtueoftheirabundanceinnaturetheyareattractiveresearchtargetsasbio-materials‘.Moreover,manypolysaccharidesfoundinherbalmedicinesexhibitpharmaceuticaleffects.Investigationsonpolysaccharide-basedmaterialsarethusofinterestinvariousfields(materialscience,pharmaceutics,greenchemistry,andothers).Celluloseisanexampleofstructuralpolysaccharides.Itisusedinthecellwallsofplantsandotherorganisms,andissaidtobethemostabundantorganicmoleculeonearth.Ithasmanyusessuchasasignificantroleinthepaperandtextileindustries,andisusedasafeedstockfortheproductionofrayon,celluloseacetate,celluloid.andnitrocellulose.Themodificationofcellulosesurfaceplaysacentralroleinthefieldofsustainablechemistry.Chemicalmodificationofnativepolysaccharides,aprerequisiteforaccesstopolysaccharide-basedfunctionalmaterials,isstilltroublesome.Thehydroxylgroupsofpolysaccharideshavesimilarreactivitytowardelectrophiles.Largenumberofresearchefforthasbeendevotedtoexploitchemical/enzymaticstrategies,esterificationandetherificationapproachestoobtainpolysaccharidederivativeshavingvariousfunctionalitiesatdesiredpositions.However,thesereactionsowntheirlimitationsinuseoforganicsolventsand/orratherharshreactionconditions.Therefore,anewmethodinvolvingClickchemistryisoneofthemostpromisingapproachesuptodatethatprovidesafacileroutetotheregio-andstereoselectivesynthesisoffive-memberedheterocyclesonthesurface.Thesereactionsareproviderapid,selectiveandspecificresponseandareexperimentallysimple,insensitiveforoxygen,andrequiringonlystoichiometricamountsofstartingmaterials[‘.7].InthepresentworkweperformedtheI,3-dipolarcycloadditionofanazidemoietyandatriplebond(Huisgenreaction)successfullyonthesurfaceofthepaperbasedcellulosewhiskers.ThesurfacemodificationwascharacterizedbyFTIR,HNMRspectroscopy,DynamiclightscatteringandzetapotentialXRD,AFMandTEM.TheTEMimagesalsoprovidetheevidencesthatcycloadditionlinkingreactionhaspackedthecrystalsinanorganizedmannersincetherectangularshapeofthestartingCWswasretained.Theoverallschemeforthemodificationofthecelluloseisgivenasfollows:

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