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

简介：Theresearchworkonpreparationprocessofactivematerialsoftherareearthionselectiveelectrodesandthevalenceoftheelectrodemembranewerereported.Theactivematerialswerechacterizedbyinfraredspectrum,elementalanalysisandXPS.Wehadstudiedtherareearthionselectiveelectrodesinwhichtheactivematerialsconsistoffunctionalpolymers.Inthispaper,theresearchworkonpreparationprocessandthevalenceoftheelectrodemembranewerereported,whichhasnotbeenseeninliteratureyet.

简介：Theself-diffusionofEu^3+ioninporousresinsD72andD751wasstudiedbyisotopeexchangereaction.ApplyingKataoka'sbidisperseporemodel,theintraparticleeffectivediffusivityDewereresolvedintoasoliddiffusivityDgandamacroporediffusivityDp.TheexperimentsshowthatDe.DpandDgallincreasewiththeincreaseofreactiontemperature;theresponseDpandDgofD751resinissmallerthanthatofD72resin;thediffusivityofEu^3+ioninsolutionislargerthanDp,whichleadstotheconclusionthatthediffusionofionintheporeofresincannotcompletelybeequaltothatinsolution.

简介：Thetetravalentmetalsaltsofmonoalkylphosphates[M(R-OPO3)2]areanewkindofstationaryphasesofchromatography-homogeneousbondedphases.Thestudiesonpreparation,structureandgaschromatographicefficiencyofceriumbis(octylphosphate)(COPP)arereportedinthispaper.Byusingchemicalanalysis,infraredspectra,x-raydiffractionanalysis,thestrongevidencethatCOPPhasalayeredstructureoftheα-zirconiumphosphatetypewasdemonstrated,therepetitiveunitisC8H17OPO3CeO3POC8H17andthereisalittlebendingorinterpenetrationofthealkylchainswithinthelayers.ThethermogravimeticanalysisoftheCOPPindicatedthatithasmuchmorethermalstabilitythansilica-basedpackings.ThethermodynamicparametersΔHandmolecularconnectivityindexesx′fortheadsorptionofseveraldozencompoundsontheCOPPhavealsobeendeterminedbygaschromatographicmethod,andthefinelinearitybetweenthemwasshown.

简介：Thecopolymerizationofl-octenewithstyrenecatalyzedbyrareearthcoordinationcatalystshasbeenstudiedforthefirsttime.Somefeaturesandkineticbehavioraredescribed.Theoverallactivationenergyofthecopolymerizationwas22.2KJ/molandthecopolymerizationratecouldbeexpressedasRp=Kp[Nd][M]2.(=1.68×10-3L2/mol2.S,50℃,[Oct]/[St]=1).ThecatalyticactivityofvariousrareearthelementsinLn（naph）3forthecopolymerizationwascomparedandshowsthefollowingsequence:Dy,Y,Yb>Ho>Sm,Gd,Nd>Pr>Ce>La>Tm.Bothmonomersofl-octeneandstyreneinthecopolymerizationbyNd（naph）3-AlEt3havethetendencyofconstantproportioncopolymerization.Thestructureofthecopolymerswasstudiedby1H-NMR.

简介：Theisothermsforsorptionoffulvicacidfromweatheredcoal,andthedistributionratios,Rd,of^169YbatvariousconcentrationoffulvicacidonNa-bentoniteandNa-Kaolinitehavebeenmeasured.Meantime,thedependencesofRdof^169YbonpHvaluesataconstantinitialconcentrationofFAwereobtained.Itwasnotfoundthattheparallelrelationshipbetweenthehighaffinityofhumicsubstancetotheclayandthehighuptakeofmetalwhichhasstrongabilitytocomplexwiththishumicsubstance.

简介：稀土元素aryloxides由各种各样的烷基组代替了[行(浆)3]例如甲基，isopropyl和tertbutyl，被用作单个部件催化剂影响L减水乳酸(LLA)的戒指洞聚合。催化活动，聚合特征，聚合动力学和机制被学习。稀土元素aryloxides的催化活动被结构和烷基组的数字在苯基戒指上影响，这被发现。越强壮烷基组的电子捐赠能力，催化活动将是越多higher。代用品组的数字的增加将导致一项更高催化的活动。镧tris(2,4,6-tri-tert-butylphenolate)[La(OTTBP)3]在所有镧aryloxides之中展出最高的活动。根据1H-NMR数据，LLA聚合经由包含减水乳酸的酰氧债券的劈开的协作插入机制继续了，这被建议。关键词戒指洞聚合-L减水乳酸-稀土元素aryloxides这个工作被山西省(号码2006011069)的自然科学基础和山西省(号码2009011059-7)的关键实验室的开的基础支持。

简介：Arareearthcoordinationsystemwasfirstinvestigatedasanewtypeofcatalystforthering-openingpolymerizationofα-aminoacidN-carboxyanhydrides（NCAs）.Theresultsforthepolymerizationofγ-stearyl-α,L-glutamate（SLG）NCAusingneodymiumacetylacetonate（Nd（acac）3）-orneodymiumtris（2-ethylhexylphosphonate）(Nd(P204)3)-triethylaluminum-waterascatalystswerecomparedwiththoseusingconventionalcatalysts.Itwasfoundthatthehelicalpoly（γ-stearyl-L-glutamate）withhighmolecularweightaswellasnarrowmolecularweightdistributioncanbeobtainedinthepresenceofNd（acac）3/AlEt3-1/2H2O.ThepolymerobtainedwascharacterizedbyIRandNMRspectroscopy.