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1、JournalofColloidandInterfaceScience339(2009)325–329ContentslistsavailableatScienceDirectJournalofColloidandInterfaceSciencewww.elsevier.com/locate/jcisCyclodextrinsmodifythepropertiesofcationicpolyacrylamidesYingWang,SujitBanerjee*InstituteofPaperScienceandTechnology,Schoolof
2、Chemical&BiomolecularEngineering,GeorgiaInstituteofTechnology,500TenthStreetNW,Atlanta,GA30332-0620,UnitedStatesarticleinfoabstractArticlehistory:Thehydrodynamicdiameter(Dh)ofcationicpolyacrylamides(c-PAM)inwatercaneitherdecreaseorReceived28May2009increasedramaticallyinthepre
3、senceofsmallamountsofb-cyclodextrin(b-CD).ItisproposedthatAccepted5August2009theCDpartiallydispersesthechargeonthepolymertherebypromotingassociationswithinoramongAvailableonline12August2009neighboringpolymerstrands.Turbiditymeasurementsshowthatb-CDenhancesthec-PAMinducedfloc-c
4、ulationofwoodpulpfibers,whichisinkeepingwithpreviousobservationsonsludgedewatering.TheKeywords:CD-polymercombinationsthatarethemosteffectiveforfiberflocculationarealsothoseforwhichDhofc-PAMthepolymerisreducedthemost.InsituationswheretheCDcompactsthec-PAM,thefibernetworkFlocassoci
5、atedwiththec-PAMisalsocompactedgivingrisetoatighterfloc.CyclodextrinHydrodynamicdiameterÓ2009ElsevierInc.Allrightsreserved.LightscatteringAcrylamide1.Introductionthesehigh-charge‘‘hotspots”,theywouldpromoteaggregationatlowCDdosage.AlthoughtheCDisuncharged,itcancomplexCyclodext
6、rins(CDs)arecyclicassembliesconstructedfromsix,withachargedsiteanddiffusethecharge,therebyminimizingseven,oreightglucopyranoseunits:a-,b-,andc-CD,respectively.therepulsionamongneighboringchargedsites.InthispaperweThestructureofb-cyclodextrinisillustratedinFig.1.Theyarenon-mea
7、suretheinteractionofb-CDwithvariousc-PAMs(intheab-toxiccommoditychemicalsusedinpharmaceuticals,preparedsenceofsludgeparticles)anddemonstratethattheCDinducesfoods,cosmeticsandotherproducts[1–4].Theycanalsoreducestrikingchangesinthehydrodynamicdiameter(Dh)ofthepoly-thetackofacr
8、ylateadhesivesbyincreasingtheirwettability[5].mer.Wethenrelatethesec
