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1、StudyonthesynthesisofpolycarboxylatesuperplasticizeratroomtemperatureitsacterizationperfmanceXiaoLiu1ZimingWang1MingZhao1TingyuHao2YancengFan2YingXu31.CollegeofMaterialsScienceEngineeringBeijingUniversityofTechnologyBeij

2、ing100124China2.CentralResearchInstituteofBuildingConstructionMCCGroupCo.LtdBeijing100088China3.InstituteofBuildingMaterialsChinaAcademyofBuildingResearchBeijing100013ChinaAbstractInthefieldofconcreteadmixturethepolycarb

3、oxylatesuperplasticizer(PCE)isusuallysynthesizedat6080C.InthisstudyaPCEwassuccessfullysynthesizedatroomtemperaturebyapolymerizationreactionamongacrylicacid(AA)maleicanhydride(MA)isopentenylpolyethyleneglycol(IPEG)toachie

4、vetheenergysavingonthebasisofexcellentapplicationperfmance.Thecompositionamountsofinitiatingsystemtheratioofmonomersweredeterminedrespectively.Theresultsshowedthattheoxidationinitiat:reductioninitiat:IPEGwas0.015:0.012:1

5、theIPEG:MA:AA:chaintransferagentwas1:2.5:1.25:0.3.MeovertheeffectofpolymerizationtemperatureonPCE’sfluidityperfmanceswasinvestigatedtheresultsshowedthatthecementpastesmixedwithPCEsynthesizedat10C20C30Crespectivelyexhibit

6、edbetterfluidityperfmancesthanthatmixedwithcommonPCEsynthesizedathighertemperature.The1Hnuclearmagicresonance(1HNMR)FourierTransfmInfraredSpectroscopy(FTIR)measurementswereusedfstructuralacterizationofthesynthesizedprodu

7、cttheresultsconfirmedtheoccurrenceofpolymerizationtheidealstructure.IndertoclearlyunderstitswkingmechanismincementpastesystemtheZetapotentialadsptionbehavihydrationheatofcementpastemixedwithsynthesizedPCEweremeasuredresp

8、ectively.TheresultsshowedthataddingthesynthesizedPCEcaneffectivelypromotethehomogeneousdispersionofcementpastethesteadilyincreasedadsptionratethelowhydrationheatlowhydrationrateindicatinganexcellentwkabilityincementpaste

9、system.FurthermetheapplicationperfmanceofsynthesizedPCEinmtarconcreteweretestedtheresultsshowedthatthecementpastesmixedwiththePCEsynthesizedatroomtemperatureexhibitedhigherwaterreducingratebetterfluiditiesfluidityretenti

10、ons.Finallytheenergysavingbenefitwascalculatedindetail.Fproducing10tonsofthisPCEsynthesizedatroomtemperaturethesavedelectricalpowerwas403.6kwhequivalentto73.8kilosofcoal.Thissynthesismethodhasgreatresearchvalueapplicatio

11、nprospectfthePCEpreparationinconcreteengineering.iginalityGenerallythePCEproductsusedinconcreteprojectsweresynthesizedat6080Caccdingtotheprincipleoffreeradicalpolymerization.Thereasonisthatthethermalinitiatcanproduceappr

12、opriatefreeradicalnumbertoensurethepolymerizationreactiononlyatthistemperaturerange.Howeveritiswellknowninthetheyofpolymerchemistrythattheoxidationreductioninitiatingsystemcansignificantlylowerthedecompositionactivatione

13、nergytoachievehigherdecompositionratelowerpolymerizationtemperaturewhichisabletobeappliedtothesynthesisofPCEinthisinvestigationbesidesthedemofPCEisincreasingyearbyyearinconcreteengineeringwhichproductionneedsagreatdealof

14、energyconsumption.TherefethesynthesisofPCEpolymerizedatroomtemperaturebytheoxidationreductioninitiatingsystemisverymeaningfultosavetheheatpowergeneratedfromthePCEpolymerizationcrespondinglythereareatleasttwoadvantagesfth

15、isinnovation:theoneisthatthesavedpowercostheatingdevicesaresubstantialtheotheroneisthatthePCEsynthesizedatroomtemperatureevenexhibitedmeexcellentpastefluidityperfmancesthancommercialPCE.Suchsuperiitiescanwidentheapplicat

16、ionofPCEsynthesizedatroomtemperatureinconstructionengineering.Keywds:polycarboxylatesuperplasticizeroxidationreductionpolymerizationroomtemperatureenergysaving1Crespondingauth:liux@bjut.Tel861067396649Fax861067396085reac

17、tiontemperature.InthisstudyaccdingtothetheyofmolecularstructuredesignthePCEswithlowsensitivitytorawmaterialsweresynthesizedthroughingtheappropriatemonomersinitiatsusingthealkylallylpolyethyleneglycol(IPEG)asmacromonomera

18、tthereactionconditionsoflowtemperature(1030C)toavoidtheoccurrenceofsidereactions.Besidestheeffectsofmonomerratioamountcompositionofinitiatingsystemtemperatureonthecementpastefluiditywereinvestigated.Thestructuralacteriza

19、tionperfmancemeasurementsofPCEswerecarriedoutthroughFTIR1HNMRZetapotentialTOChydrationheat.TheapplicationperfmancesofmtarconcretemixedwiththistypeofPCEweresystematicallystudied.Atlastthecalculatedenergysavingevaluationsh

20、owedthatthissyntheticmethodcannotonlyachieveenergyconservationCO2emissionreductionbutalsoshtentheproductioncyclereducetheproductioncostwhichcanplayapositiveroleinfurtherpopularizationapplicationofPCE.2.Experimental2.1Mat

21、erialsReactionrawmaterialsinclude:isopentenylpolyethyleneglycol(IPEG)acrylicacid(AA)maleicanhydride(MA)ammoniumpersulfate(APS)sodiummethallylsulfonate(SMAS)bicAcid(ASA)sodiumhydroxide(NaOH).ReferencecementP.I.42.5wassupp

22、liedbyChinaBuildingMaterialsResearchInstitute(BeijingChina).ThephysicalacteristicschemicalcompositionsofreferencecementareillustratedinTable1.Thewaterusedinthisexperimentwasdeionizedwater.Table1Physicalacteristicschemica

23、lcompositionsofreferencecementacteristicscompositionsReferencecementP.I.42.5Apparentdensityg?cm33.10Fineness(0.08mmsievebymass)%0.30Specificsurfaceaream2?kg1353Nmalconsistency(bymass)%27.60Initialsettingtimemin209Finalse

24、ttingtimemin267SiO2%21.58Al2O3%4.81CaO%62.21MgO%2.89SO3%2.40Na2O%0.15Fe2O3%3.262.2SynthesisTheIPEGweredilutedbydistilledwaterinafourneckroundbottomflaskwhichwasplacedinaconstanttemperaturebathwithstirring.Whenstirredhomo

25、geneouslyanaqueousmixtureofAAMAAPSSMASwerewiseaddedtotheflask.After10minutestheASAaqueoussolutionwasalsowiseaddedtotheflask.Thepingprocesslasted2hoursthenthereactionataconstanttemperaturef3hours.ThereaftertheNaOHaqueouss

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