简介：Themechanismofcesiumexchangeonpotassiumtitaniumhexacyanoferrate(KTiFC)isdescribedinthispaper.Thedependenceoftheexchangerateontemperature,particlegranulesize,andshakingfrequencyisstudied.Theresultsshowthationexchangeprocessiscontrolledbyliquidfilmdiffusioningranuleparticle.AnexchangereactionoccursmainlybetweenK^+intheexchangerandCs^+inthesolution.

简介：Thereactionmechanismsofdienepolymerizationwithhomogeneousrareearthcatalystarestudiedbymeansofthespectraof1H-NMR,one-andtwo-dimensions13C-NMR.BasedonthedataofaboveNMRspectra,itisproposedthatthepolymerizationreactionproceedsaccordingtothefollowingmechanism:η4-diene（cis-（?）trans-）andη3-allyl（syn-（?）anti-）.

简介：Theadsorptionof2,4-dinitrophenoland2,6-dinitrophenolonnon-polarandpolaradsorbentswasstudied.TheresultsshowedthattheequilibriumadsorptiondidnotcomplywiththeLangmuirequationandwasnotmono-layeradsorption.ItisofinteresttonoticethattheeffectofpHontheadsorptionof2,4-or2,6-dinitrophenolontoADS-7andADS-21wasverysmall,Theresultisexplainedbyhydrogenbondinginteractionbetween2,4-or2,6-dinitrophenolandtheadsorbentADS-21.ThelargeadsorptioncapacityofdinitrophenolontoADS-21,whichwasabout500mg/gatanequilibriumconcentrationof400mg/L,andthesmalldinitrophenolleakageintheeffluentfromADS-21columnpresentedagoodprospectfortreatmentofwastewatercontainingdinitrophenolwithadsorbentADS-21.

简介：

简介：α,α-dimethoxy-α-Phenylacetophenone（DMPA）isanefficientandthermallystablephotoinitiator.Hereitsspectralcharacteristicsinthetransientstatewereshown.Thetransientspecieswereidentifiedasabenzoylradicalandadimethoxyibenzylradicalthatplayedaprimaryinitiationroleinpolymerization.ThekineticsandmechanismofthebulkpolymerizationofMMAwereinvestigated.TheexponentofDMPAconcentrationandkp/k11/2valuewerefoundtobe0.5and0.066mol（-1/2）l1/2s-1/2,respectively.Theexistenceofoxygenledtoobtainthepolymerwithhighermolecularweight,whichcanbeattributedtotheoccurrenceofthesubsequentpolymerizationinducedbyactivepolymerendgroup.Inthephotocrosslinkingreaction,thedependenceofDMPAcontentoninitialratehasbeenfound.AprincipalreasonisthatthesamplecontainedhigherpercentageofDMPAhashigherlight-absorbedefficiency.Insolidfilm,higherconcentrationofDMPAispermittedtobeusedbecausethereislittleexcitedstateself-quenchingeffectintherigidmedium.

简介：Thereexistsauniversalphenomenathatsodiumionsareleakedfromthestrongbasicanionexdchangerinoperation,whichhasbeenpuzzlingtheresearchersworkinginthefieldofwatertreatmentforyears.Itiswellknownthattheleakageofsodiumionswillseriouslyaffectthepruityofeffluent.Onthebasisoflotsoflaboratoryandindustrialexperiments,themechanismofthesodiumionsleakedfromananionexchangerhasbeenpreliminarilymadeoutandsomenewchemicalreactionequationsaswellassomeimprovingmeasureshavebeenputforwardinthisarticle.

简介：ItwasgenerallyconsideredthatcontaminationofthegeltypepolystyrenestrongbasicanionexchangeresinbyorganicmatterinnaturalwateristheresultofionexchangeandVanderwaal′sadsorptiononit.Onthebasisoflaboratoryandindustrialexperiments,thispaperconfirmedthattheinterreactionbetweenorganicmatterandresinpolymermatrixisprimarilycontroledbyaVanderwaal′sadsorption.

简介：Sm(Ⅲ）wasquantitativelyadsorbedbyaminomethylenephosphonicacidresin(APAR)inthemediumofpH=5.0,Thestaticallysaturatedsorptioncapacityis251mg/g.resin.Sm(Ⅲ）adsorbedonAPARcanbereductivelyelutedby2.0mol/LHCl.Thesorptionrateconstantisk298=1.35×10^-5s^-1.ThesorptionbehaviorofAPARforSm(Ⅲ）obeystheFreundlichisotherm.TheenthalpychangeΔH°ofsorptionis24.9kJ/mol.TheapparentactivationenergyisEa=11.7kJ/mol.ThesorptionmechanismshowsthatthenitrogenandoxygenatomsofthefunctionalgroupofAPARcoordinatedwithSm(Ⅲ）toformcoordinationbond.

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简介：Polymerizationofacrylonitrile(AN)inaqueousnitricacidinitiatedbypolypropylene-basedpolyamidoxime(PPAO)-thiourea(TU)combinationhasbeeninvestigated.Theoverallrateofpolymerization(R_p)undertheconditionsof[TU]/[PPAO]<0.5molarratioisThemolecularweightsofthepolymerswerefoundtobeinverselyproportionalto3/2-powerofnitricacidconcentrationand1-powerofthioureaconcentration.Inaddition,itisindependentwiththeconcentrationsofmonomerandPPAO,anddecreaseswithincreasingtemperature.Onthebasisoftheseexperimentalresults,acoordination-protontransfermechanismfortheinitiationwasproposedanddiscussed.

简介：X-rayphotoelectronspectroscopy(XPS)wasadoptedtoelucidatesorptionmechanismofphenolandp-nitrophenolontoaweaklyanionexchangerD301.ThedistributionofspecificformsoftertiaryaminogrouponD301wasobtainedandeffectoffreetertiaryaminogrouponphenolsorptionontoD301wasdiscussed.TheresultindicatedthatthepercentoftheprotonatedtertiaryaminegrouponpolymericmatrixwasmuchlowerthanthereferencecompoundN,N-dimethylbenzylamineatanidenticalpHvalueinsolutionduetothemuchloweractivitydegreeofhydrogenionininnerresinphasethanintheexternalsolution.LessfreeaminogrouponD301resultsinlesssorptioncapacityofphenolandp-nitrophenolinanacidicsolution.UndertheexperimentalconditionsbothphenolsorptionontoD301canbeexplainedassolidextractionandthedistributioncoefficientvarieslinearlywiththecontentoffreeaminogrouponD301.

简介：Theformationmechanismofmonodispersepolymerlatexparticlesintheemulsifier-freeemulsionpolymerizationofmethylmethacrylateandbutylacrylatewithpotassiumpersulfateasinitiatorwasinvestigated.Amulti-stepformationmechanismforthemonodispersepolymerparticleswasproposed.Thenucleationmechanismisconsideredtobethecoagulationoftheprecursorparticlesbyhomogeneousnucleationwhentheprimaryparticlesreachacriticalsizewithhighsurfacechargedensityandsufficientstability.Ithadbeenprovedbyaspecialexperimentthattheearlylatexparticlesformedbythecoagulationwerestable.Theprimaryparticlesgrowbyabsorbingmonomersandradicalsinthepolymerizationsystemandthenbecomecolloidallyunstableagainduetotheunderstandabledecreaseofparticlesurfacechargedensity,whichleadstotheaggregationofthegrowingparticlesandtheformationoflargerlatexpediclestherefrom.Anerthenucleationperiod,thepreferentialaggregationofthesmallerparticlesinthepropagationprocessleadstothechangeoftheparticlestowardsauniformsizeandnarrowerparticlesizedistribution.Thecoexistenceandcompetitionofhomogeneousnucleation,coagulation,propagationandaggregationresultintheincreaseofthepolydispersityindex(U=D43/D10)inthefirstStage,thenitsdecreaseinthelaterstagebecauseofthecompetitionofpropagationandaggregation,andthegradualformationofthemonodisperseparticles.

简介：包含磷氮(MSMM-Al-P)的新奇包含的火焰retardant被与聚酰胺66包含准备(PA66-MSMM-Al-P)为聚酰胺6的火焰延迟(PA6)。结构和PA66-MSMM-Al-P的热性质被Fourier变换红外线的光谱学，X光检查光电子光谱学和thermogravimetric分析描绘。包含火焰retardants(MSMMAl-P和PA66-MSMM-Al-P)的PA6易燃被限制的氧索引测试，垂直燃烧测试和锥热量计调查。火焰retardancy和锥calorimetric分析在flame-retardantPA6建议了在PA66和MSMM-Al-P之间的synergistic效果。flame-retardantPA6的热稳定性也被调查。

简介：Theadsorptionisothermsofglycine,alanineandoxidizedglutathiononstrongacidcationandstrongbaseanionexchangeresinsfromaqueoussolutionsweremeasuredandthesuperequivalentadsorptionsofglycineandalanineobserved.Theinfraredspectraofglycineadsorbedonthecationandtheanionexchangeresins,001×7and201×7,weremeasured.Fromtheseresults,itisconcludedthattheaminoacidadsorptionontheionexchangeresinproceedsnotonlythroughionexchangeandprotontransfermechanisms,butalsothroughaminecarboxylateinteractionbetweentheadsorbedaminoacidmolecules,andtheformationofsecondlayerofaminoacidmoleculesisthemechanismofsuperequivalentadsorptionofaminoacid,thecarboxylateoraminegroupsofthefirstlayerofaminoacidmoleculesontheionexchangeresinactastheexchangesitesforthesecondlayerofaminoacidmolecules.

简介：Inthispaperstudyonthepropertyandmechanismofadsorptingrheniumfromaqueoushydrochloricacidbyusingmethylphosphorousaciddimythylheptylesterlevextrelresin(CL-P350)isreported.Theeffectsoftime,acidity,concentrationofrhenium,andtemperatureontheadsorptionofrheniumwereinvestigated.ThemechanismofadsorptingrheniumwasdiscussedbychemicalanalyticandIRmethod,anddynamicadscrptionandelutionwerestudied.Experimentalresultsshowthattheadsorptionequilibrationisreachedin4min,thedistributioncoefficient(D)ofRe(Ⅶ）increaseswithincreaseofconcentrationofHClandreachesmaximum3.0-4.0moL/LHCl.ReO4^-istakenupbyionassociationmechanismandcanbedescribedbyLangmuirequationoftheequilibriumstate.ThethermodynamicparametersintheadsorptionprocessofReO4^-havebeendeterminedtobe:ΔH=-29KJ/moL,ΔG=-25KJ/moLandΔS=-13.5J/moLrespectively.Thesaturationadsorptioncapacityofrheniumis19.2mg/gwhenthesolutioncontaining0.372g/LReand3.0mol/LHClwaspassedthroughtheresincolumn.Therecoverypercentageofrheniumis98.4%whiledistilledwaterwasusedasaneluent.