简介：Theadsorptiondynamicsforphenolinaqueoussolutionoftheadsorbentbasedonpolystyrenewasstudied.InordertodistinguishwiththeBoydquasi-homogeneousmodeloftheinnerstructureofion-exchanger,theparticlediffusionmodelincludingsurfacediffustionmodelandporediffusionmodelwassuggestedwhichissuitabletothemacroporousadsorbent.Thediffusiondeterminationstepoftheadsorptionpocesswasestablishedandtheeffectivediffusioncoefficientwasalsodetermined.Theinfluenceofsurfacediffusionandporedifusionontheparticlediffusionratewasinvestigatedqualitatively.Allofthesewereveryimportanttoimprovethestructureofthemacroporousadsorbentinordertoimprovethemass-transferrate.

简介：Inthispaper,twokindsofPS-PTCsweresynthesizedusingdifferentmethodsbyintroducingcinchonineandquininetothepolymersupport.TheircatalyticpropertiesforthealkylationofN-diphenylmethyleneglycinet-butylesterwerealsocompared.

简介：

简介：Thesemibatchemulsifier-freeemulsioncopolymerizationofmethylmethacrylate(MMA)andbutylacrylate(BA)inthepresenceof2-hydroxyethylmethacrylate(HEMA)initiatedbyK2S2O8(PSP)wasstudied.Thelatexparticlescanmaintainanappreciablestabilityduringtheemulsifier-freeemulsioncopolymerizationofMMAandBAinthepresenceofHEMA.Theaverageparticlediameterincreasewithanincreaseoftotalsolidscontent,HEMAcontent,PSPcontent,ionicstrengthofthesystemandmonomerfeedrate,anddecreasewiththemonomerfeedrationfrom3/1(MMA/BA:molarration).to1/3.ThestabilityofthisreactionsystemisimprovedbyaddingHEMAasnonioniccomonomer,Highsolidscontent(50%)latexwithmonodisperseparticlecanbeobtainedusingthisprocess.

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

简介：Anewbis(aroylacetylene)containingtfiazoleandfluorenemoietiesissynthesizedbyclickchemistry.Polycyclotrimerizationofthemonomeriscatalyzedbypiperidineinrefluxeddioxane,furnishingaregioregularpoly(aroylarylene)inasatisfactoryyield.Thehyperbranchedstructureofthepolymerischaracterizedspectroscopicallywithsatisfactoryresults.Thepolymerenjoysnometaldetrimentandissolubleincommonorganicsolventssuchastetrahydrofuran(THF),chloroform,dichloromethane(DCM),andN...

简介：Theuniformsurfaceion-imprintedresinsforZn2+astheimprintingguestwerepreparedbyemulsifier-freeemulsionpolymerizationutilizingallyphenylhydrogenphosphateasafunctionalcomonomer.TheZn2+-imprintedresinadsorbedZn2+muchmoreeffectivelythandidtheunimprintedone.Theselectivefeatureofthesurfaceimprintedresinstothetemplateionswasdemonstrated.

简介：Theadsorptionoflowconcentrationoffreeacidbyregenerablechitinisfollowedbyelectricconductancedetermination.Theeffectofacidconcentratioin,contentoffunctioinalaminogroups,andionicstrengthonadsorptionwasdiscussed.Experimentalresultsindicatethattheactivecentreofregenerablechitinisthefreeaminogroupsonistsurface,andthattherateofadsorptionoffreeacidwasfoundtobeaffectedbytwofactors:theinteractionbetweentheadsorbentandtheadsorbateinsolutionandthatbetweentheadsorbatemoleculesorionsinsolution.

简介：有在粒子的核心的高carboxyl内容的没有肥皂的吸水恐水病的核心壳乳胶粒子经由播种乳剂被综合聚合使用甲基methacrylate(MMA)，丁基acrylate(BA)，甲基丙烯酸(MAA)，苯乙烯(圣)和乙烯乙二醇dimethacrylate(EGDMA)作为单体，并且在聚合，粒子尺寸和形态学上在核心准备使用的MMA内容的影响被传播电子显微镜学调查，动态轻散布结果证明播种乳剂聚合能用当在核心准备的MAA内容是时，喂过程的饥饿的单体顺利被执行平等者到或不到24wt%，并且有恐水病的PSt壳的吸水的P(MMA-BA-MAA-EGDMA)核心的包含的效率随MAA内容的增加减少了。当有中等极性的P(MMA-MAA-St)的夹层在P(MMA-BA-MAA-EGDMA)核心和PSt壳之间被插入时，井在核心准备与24wt%MAA内容设计了没有肥皂的吸水恐水病的核心壳乳胶粒子被获得。