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简介：Theelectrochemicaloxidationofdiphenylamineinacetonitrileproducesanadherentuniformpolymerfilmwhichexhibitsmutiplecolourvariation(yellow-green-blue)inawiderangeofpotentialscan.Thepolymerizationmechanismandthestructureofthepolymerwerestudiedbycyclicvoltammetry,FT-IRandinsituESR.Theresultsindicatethattheelectrochemicalpolymerizationofdiphenylaminebelongstoacationicradicalpolymerizationprocess.Duringelectrolysis,onlyoligomerswereinitialyproduced,thenpolymerfilmwasformedontheelectrodesurface.Theelectropolymerizationperformsviathe4,4’C-Cphenyl-phenylcouplingmechanism.

简介：InthispaperareversibleMarkovprocessasachemicalpolymersreactionoftwotypesofmonomersisdefined.Byanalyzingthepartitionfunctionsoftheprocessweobtainthreedifferentdistributionsoftheaveragemolecularweight,dependingofthevalueofstrengthofthefragmentationreaction,andprovethatagelationoftheprocesswilloccurinthethermodynamiclimit.

简介：Experimentaldataofhydrolyticpolymerizationoflanthanideionsinaqueoussolutionweretreatedbygraphicmethod,computerfittingandpqanalysis,speciespresentwereascertainedandhydrolysisconstantsobtained.Ln（OH）2+andLn2（OH）24+predominatedinthespeciesofallhydroly-sisproducts.Whenthefirstandthesecondhydrolysisconstantswereplottedagainstradiiandef-fectivenuclearchargeoflanthanideions,thecurvesobtainedconformedwiththe“three-divisiongroups”rule.CorrelationbetweenhydrolysisconstantsofLn2（OH）24+andotherhydrolysisconstantsislinear.Usingtheaboveempiricalcorrelationswecalculatedhydrolysisconstantsofalllanthanideionsandobtainedsatisfactoryresultswhichshowedgoodregularityforhydrolysisoflanthanideionsandthussystematizedalldataofthereaction.

简介：Samplesofpolyphenylsilsisquioxane（PPSQ）usingCaF2orMgF2asthemaincatalystshadbeenpreparedunderdifferentpolymerizationconditions.TheresultsweretreatedonanorthogonaldesignL9（34）.Allweight-averagemolecularweights（MW）ofPPSQhadbeenmeasuredbygelpermeationchromatography（GPC）.Effectsofpolymerizationconditionsincludingreactiontemperature,compositionofthedualcatalysts（CaF2orMgF2andDCC）,mixtureofsolventsandreactiontimeonMWofPPSQhavebeendiscussed.ThequantityofthecatalystsisthemostimportantfactorthataffectsMWofPPSQ.Reactiontemperatureisthesecondimportantfactor.AppropriatepolymerizationconditionhasbeenestablishedtogetPPSQwithhighMW.

简介：Thekineticsofsuspendedemulsionpolymerizationofmethylmethacrylate(MMA),inwhichwateractedasthedispersedphaseandthemixtureofMMAandcyclohexaneasthecontinuousphase,wasinvestigated.Itshowedthattheinitialpolymerizationrate(Rp0)andsteady-statepolymerizationrate(Rp)wereproportionaltothemassratiobetweenwaterandoilphase,andincreasedasthepolymerizationtemperature,thepotassiumpersulphateconcentration([I])andtheTween20emulsifierconcentration([S])increased.Therelationshipsbetweenthepolymerizationrateand[I]and[S]wereobtainedasfollows:Rp0∝[I]0.73[S]0.32andRp∝[I]0.71[S]0.23.TheaboveexponentswereclosetothoseobtainedfromnormalMMAemulsionpolymerization.Italsoshowedthattheaveragemolecularweightoftheresultingpoly(methylmethacrylate)decreasedasthepolymerizationtemperature,[I]and[S]increased.Thus,MMAsuspendedemulsionpolymerizationcouldbeconsideredasacombinationofmanyminiatureemulsionpolymerizationsproceedinginwaterdropsandobeyedtheclassicalkineticsofMMAemulsionpolymerization.

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简介：Basedonthepreparativeexperimentsofthelight-emittingdiode(LED)encapsulant,threetypesofmonomermodelswithdifferentfunctionalgroupsarecarriedouttostudythepolymerizationprocessbydynamicMonteCarlo(DMC)simulationandbondfluctuationmodel(BFM).Wecalculatethedegreeofpolymerization,theradiusofgyrationandthefrequencyofvoidspherestodiscussthepolymerizationprocess,themolecularsizeandthespatialdistributionatdifferentvolumefractionsandproportions.OurresultsareinagreementwithGrest'sdecayrateandFlory'sscalelaw.Simulationsshowthatthepolymerizationprocessdependsontheappropriatevolumefractionandproportionexceedingly,andthevolumecontractioninthepolymerizationprocesscanalsobeobservedinthisstudy.Theseinvestigationscouldprovidesomeinsightsintotheunderstandingofthepolymerizationprocessoftheencapsulantandhelpustoadjusttheparametersinlaterexperiments.

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简介：Ring-openingpolymerizationofε-caprolactone（CL）catalyzedbylanthanocenes,O（C2H4C5H3CH3）2YCl（Cat-YCl）andMe2Si[（CH3）3SiC5H3]2NdCl（Cat-NdCl）hasbeencarriedoutforthefirsttime.IthasbeenfoundthatbothyttroceneandneodymoceneareveryefficienttocatalyzethepolymerizationofCL,givinghighmolec-ularweightpoly（ε-caprolactone）（PCL）.Theeffectsof[cat]/[ε-CL]molarratio,polymeriza-tiontemperatureandtime,aswellassolventswereinvestigatedandpolymerizationtem-peratureisfoundtobethemostimportantfactoraffectingthepolymerization.ThebulkpolymerizationgiveshighermolecularweightPCLandhigherconversionthanthatinsolu-tionpolymerization.NaBPh4wasfoundtopromotethepolymerizationofε-caprolactone,andthustoincreaseboththepolymerizationconversionandMWofpoly（ε-caprolactone）.

简介：Tosensitizepolyanilinewithdyesbyelectrochemicalpolymerization,HClO4isemployedasthedopantandoxidant,andthepolyanilinewithdiffernetsensitivepropertiesissynthesized.Theeffectofsensitizedemeraldinesaltontheabsorptionspectrumisdiscussedindetails.Themaximumconductivityofsensitizedfilmsreaches1.22S/cm,andinvestigationondyesensitizingofthepolymerrevealsthatC.I.DirectBlue71,C.I.DirectBlue84,C.I.DirectBlack19andCuPc-(COOH)4mayenhancethephotoconductivityofpolyanilinegreatly.

简介：Thecharacteristicsofstyrene-acrylicacidcopolymersupportedlanthanidecomplexes(SAACLn)(Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tin,Yb,andLu)weredescribed.AcomparisonoftheactivitiesofSAAC·Lnwasmade.Itwasfoundthatinthepolymerizationofbutadiene,apeakinactivityappearedatNdandPr,Sin,Euandtheheavylanthanidesexhibitedlowornoactivities.Theeffectsofsomefactorsontheactivitieswerediscussed.Themicrostructureofthepolymersobtainedwithallthelanthanidesintheserieswerethesameandthecontentofcis-1,4polybutadieneattainedwasmorethan98%.

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

简介：ThepolymerizationofMMAinitiatedbycopper(Ⅱ）chelatingresins/CCl4systemwasstudied.Fromthekineticdata,thekineticequationofpolymerizationcanbeexpressedasRp=Ke^-56400/RT[MMA]^1.57[CCl4]^m[RESIN-Cu]^0.18wherem:3-4.5,when[CCl4]0.1-6.93M.Thefreeradicalpolymerizationmechanismisproposed.Theprimaryradicalsareformedbytheprocessofcomplexation-chlorinetransformationamongthecopper(Ⅱ)chelatingresin,CCl4andmethacrylate.

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简介：一系列电子施主包括1,1-cyclopentanecarboxylic酸diethyl酉旨(CPCADEE)，1,1-cyclopentanedimethanol醋性的diester(CPDMAD)，1,1-biethoxymethyl戊烷(BEMP)，2,2-diethyldiethylmalonate(DEDEM)和2,2-diethyl-1,3-propanediol醋性的diester(DEPDADE)，被diethylmalonate(DEM)综合。上述产品的纯净和结构被煤气的层析(GC)和煤气的层析团分光计(GCMS)分别地描绘。而且，这些施主的可能的最佳的三维的结构借助于Gaussian03和Chem3D被模仿。然后，这些电子施主与tetrachloro钛(TiCl4)和氯化物镁(MgCl2)被协调为丙烯的聚合获得催化剂。当CPCADEE或DEPDADE被用作内部施主(标志)时，聚丙烯的催化活动和性质被增加外部施主(编辑)极大地改进。然而，当BEMP被用作标志时，没有增加编辑，最高催化的活动被获得，它能减少生产费用并且简化催化合成。实验显示BEMP有氧原子和最高的electronegativity的最短的距离。

简介：用maghnite-H+的tetrahydrofuran的cationic戒指洞聚合被报导。Maghnite-H+，从质子发出的无毒的稳固的催化剂被交换montmorillonite泥土。Polytetrahydrofuran，也poly打电话(butandiol)醚，与醋酸盐和氢氧根结束，组们成功地被综合。反应温度，开始者/单体的重量比率和单体的变换上并且在分子的重量上的反应时间的效果被调查。反应的cationic机制被建议。这化学能为poly准备被看作一条合适的线路(THF)作为为热塑的弹性体的一个软片断。

简介：有一双chelatingaminotropone的Ti建筑群的合成和结构[在上]ligand被报导了。功能的理论(DFT)学习的密度的计算建议当与methylaluminoxane(毛)激活时，二度(aminotropone)Ti建筑群为olefinic单体的聚合有高潜力。这些理论研究也证明活跃种类通常从二度(aminotropone)导出Ti催化剂与用二度(phenoxyimine)生产的那些相比拥有更高的electrophilicity自然作为高效石蜡聚合催化剂被知道的Ti建筑群(TiFI催化剂)。二度(aminotropone)Ti催化剂产生比TiFI有更高的electrophilicity的催化地活跃的种催化剂。

简介：Thispaperreportsthekineticsofgrouptransferpolymerization(GTP)ofethylacrylate(EA)withzinciodidecatalystin1,2-dichloroethaneusingdimethylketenemethyltrimethylsilylacetal(MTS)asinitiatorat0℃andabove0℃.Theamountofcatalystusedwasstudied.Whenzinciodidecatalystusedismorethan10mol%relativetomonomer,therateofpolymerizationisproportionaltotheconcentrationofmonomer,whereaszinciodidecatalystusedislessthan10mol%ofthemonomer,therateofpolymerizationisindependentofthemonomerconcentration.IntheGTPofEAaninductionperiodwasobservedwhenthezinciodidecontentsarelessthanl0mol%.Ifthereactiontemperatureisover0℃,livingspeciesbecomeunstableanddiminish,leadingtoincompletemonomerconversion.Thereactioncurvesequationsareobtained.Thepolymershavenarrowmolecularweightdistributionswhicharenotchangedasdecreasingzinciodidecontents.Thepolydispersityisabout1.2.