简介:TheA-Bblockcopolymerof0634-chloroethylglycidyletherwithstyrenecanbegotbytheeasymethodofone-steppolymerization.ThestructureofA-Bblockcopolymerwasconfirmedbytheelementaryanalysis,turbiditytitration,molecularweightmeasurement,IR-spectra,13C-NMR,1H-NMRandDTAinvestigationoftheproducts.Also,theeffectsofsolvents,reactiontimeandtemperatureonthecomposition,Mnandyieldofcopolymerhavebeenstudied.
简介:水泡的行为上的可视化研究为水池在压力0.1MPa在一个水平透明加热器上沸腾R141b被执行了。水泡的行为被在加热器表面下面放的一个高速度的照相机记录。离开直径,水泡的离开时间和在不同的热流动的成核地点密度被获得。可视化结果证明水泡离开直径和离开时间减少,当当热流动增加,成核地点密度增加时。没有液体,在实验招募进microlayer,这也被观察。基于试验性的结果,煮曲线因为R141b被使用动态microlayer模型预言。作为结果,在基于动态microlayer,为沸腾的模型和实验数据R141b弄弯的预兆的结果之间的协议擅长高热流动。关键词R141b-热转移-水泡动力学-水池沸腾CLC数字TK124
简介:Thetetranuclearalkyltin(Ⅳ)compounds{[R2Sn(C9H8N3O3)O]SnR3}2[R=n-Bu(1),4-CNC6H4CH2(2),C6H5CH2(3),4-ClC6H4CH2(4)]werepreparedbythereactionofSchiffbaseligandpyruvicacidisonicotinylhydrazonewith(R3Sn)2Ointhecorrespondingmolarratioof1:1.Allcompoundshavebeencharacterizedbyelementalanalysis,IRand^1HNMRspectra.Thecrystalstructureofcompound1wasdeterminedbyX-raysinglecrystaldiffractionalanalysis.Thiscompoundexhibitsadimericstructurecontainingdistannoxaneunitswithtwotypesofthetinatoms.Forthefirsttinatom,itappearstobeseven-coordinatedwithadistortedpentagonalbipyramidgeometry,andtheotherisfive-coordinatedwithadistortedtrigonalbipyramidalgeometry.Themoleculesarepackedintheunitcellintwo-dimensionalnetworkstructurethroughaninteractionbetweentheNatomsofthepyridineandthetinatomsofanadjacentmolecule.
简介:Blendsofpoly(3-hydroxybutyrate-co-3-hydroxyhexanoate)(PHBHHx)andpoly(butylenesuccinate-adipate)(PBSA),bothbiodegradablesemicrystallinepolyesters,werepreparedwiththeratioofPHBHHx/PBSArangingfrom80/20to20/80bymeltmixingmethod.Differentialscanningcalorimetry(DSC),thermogravimetryanalysis(TGA),dynamicmechanicalthermalanalysis(DMA),polarizingopticalmicroscopy(POM)andwideangleX-raydiffractometer(WAXD)wereusedtostudythemiscibilityandcrystallizationbehaviorofPHBHHx/PBSAblends.ExperimentalresultsindicatethatPHBHHxisimmisciblewithPBSAasshownbythealmostunchangedglasstransitiontemperatureandthebiphasicmelt.
简介:Inthispaper,thetwoeffluentsfromPBA(3-phenoxy-benzaldehyde)productionprocessweretreatedbypolymericadsorbentCHA-111.PBAorPBC(3-phenoxy-benzoicacid)wasrecoveredfromthewastewaterintheprocessofneutralization.Asasecondarytreatmentmethod,adsorptionwithCHA-111showedbetterefficiencythanphotocatolyticdecompositionandsolventextraction.Theoptimaltechnologicalparameterswere:adsorption:currentvelocity:2.0BV/hr(bedvolumeperhour),roomtemperature;desorption:currentvelocity:2.0BV/hr(bedvolumeperhour),roomtemperature;desorption:currentvelocity:1.0BV/hr,80℃,8%sodiumhydroxideaqueoussolutions.Inconclusion,99.9%CODintheneutralizingwastewaterand98.4%CODinthehydrolysiswastewaterareremovedsuccessfully.
简介:Thehomoclinicbifurcationsinfourdimensionalvectorfieldsareinvestigatedbysettingupalocalcoordinatesnearthehomoclinicorbit.Thishomoclinicorbitisnonprincipalinthemeaningsthatitspositivesemi-orbittakesorbitflipanditsunstablefoliationtakesinclinationflip.Theexistence,nonexistence,uniquenessandcoexistenceofthe1-homoclinicorbitandthe1-periodicorbitarestudied.Theexistenceofthetwofoldperiodicorbitandthree-foldperiodicorbitarealsoobtained.
简介:Wastewaterfromproductionprocessof2,3-acidwastreatedbyadsorptionusingmacroporousresinNDA-708.Afteronlyone-steptreatmentbyresinadsorption,removalefficiencyofthreekindsofnaphthalenechemicalswasabove99%;removaleficiencyofCODcrwasabove96%.Underproperoperatingcondition,desorptionefficiencywasaround100%.Therunningrecordsoftheindustrialfacilityshowedthatthenaphthlenechemicalsindesorptioneffluentcouldbereusedwithoutobviousinfluenceonthequalityoftheproduct.
简介:Sixnewcompounds,α,β-KaHb[GeW9M3(H2O)3O37].xH2O(M=Al,Ga,In;a+b=7)andα-K9H5[Ge2W18Ga6(H2O)3O74].20H2O,weresynthesizedfromthelacunaryprecursorsαandβ-GeW9O3410-andcharacterizedbyelementalanalysis,spectroscopyandelectrochemistry.Tungsten-183NMRspectraofthetitlecomplexesconsistoftwolineswithintensityratio2:1asexpectedfortrisubstitutedheteropolyanions.Theintensityratioofα-Gacompoundis1:2,whichisdifferentfromothers(2:1).WiththehelpofFABmassspectrum,weconcludedthatitisadimerwithD3h,structureinaqueous,andtheothersexistbymonomerswithC3cstructures.
简介:Thispaperintroducesanimprovednewmethodwhichisusedtorecoversilverassilvernitratebyionexchangefromthewasters.Inthismethod,wecanrecoversilvernitrate,onlybyusingakindofionexchangeresinandtwoionexchangeprocesses.Itcanreplacetheoriginalrecoverymethodinwhichtwokindsofionexchangeresinsandthreeionexchangeprocessesareneeded.Theresultissatisfied
简介:Newphosphorus-andselenium-containingheterocyclyes,1,3,2,6-dioxaphosphaselena-cyclooctanes(la-1h),weresynthesizedbythereactionofbis(2-hydroxyethyl)selenidewithRP(X)Cl2whereR=alkoxyl,aroxyl,arylandX=Oorlonepair.Theirstructuresweredeterminedbyspectro-scopiesandelementalanalysesandfinallyconfirmedbytheX-raycrystallographicanalysisof1c.Themolecularstructuresoftheheterocycleswerediscussedintermofconformationalanalysis.
简介:A3-DnonlinearproblemofsupercavitatingflowpastanaxisymmetricbodyatasmallangleofattackisinvestigatedbymeansoftheperturbationmethodandFourier-cosine-expansionmethod.Thefirstthreeorderperturbationequationsarederivedindetailandsolvednumericallyusingtheboundaryintegralequationmethodanditerativetechniques.Computationalresultsofthehydrodynamiccharacteristicsandcavityshapesofeachorderarepresentedfornonaxisymmetricsupercavitatingflowpastconeswithvariousapex-anglesatdiffer-entcavitationnumbers.Thenumericalresultsarefoundingoodagreementwithexperimentaldata.
简介:ThisinvestigationpresentstheGreenfunctionsforadecagonalquasicrystallinematerialwithaparabolicboundarysubjecttoalineforceandalinedislocationbymeansofthecomplexvariablemethod.ThesurfaceGreenfunctionsaretreatedasaspecialcase,andtheexplicitexpressionsofdisplacementsandhoopstressattheparabolicboundaryarealsogiven.Finally,thestressesanddisplacementsinducedbyaphononlineforceactingattheoriginofthelowerhalf-spacearepresented.
简介:ThetitlecomplexEu(Ⅲ)(TTA)3(phen)(whereTTA=thenoyltrifluoroacetonemonoanion;phen=1,10-phenanthroline)hasbeensynthesizedinmixedsolventsofacetoneandethanol(1:1volumeratio)anditscrystalstructurehasbeendeterminedbyX-raydiffraction.Thecomplexcrystalsaretriclinic,spacegroupP1(#2)withcelldimensionsofa=1.3241(2)nm,6=1.5278(4)nm,c=0.9755(3)nm,α=92.49(2)°,β=102.57(2)°,γ=91.62(2)°,V=1.9268(8)nm3,Z=2,μ(MoKα)=18.77cm-1,Dx=1.720g/cm3.ThecoordinationgeometryofEuatomisadistortedsquareantiprism,andtheencapsulatedstructurethatcanmeetthestructuralrequirementofthetypicaleuropiumluminescentsensor.Thefluorescencespectrumsuggeststhatthecomplexisastrongphotoluminescentmaterial.
简介:ThecomplexK3H4GeW9V3O40·8H2OcrystallizedinamonocliiniesystemwithspacegroupP2,Mr=2784.67,a=11.099(3),b=16.452(4),c=13.534(4),β=108.14°,Z=2,V=2348.493,F(000):2456,μ=239.7cm-1,De=3.932g/cm3.ThefinalR=0.083for4528non-zeroreflexions.ThestructureofanionsGeW9V3O40andGeW9O34belongstoA--type.
简介:Averymildandextremelyefficienthydrolysismethodfortransformationofpolystyrene-b-poly(tert-butylacrylate)(PS-b-PtBA)topolystyrene-b-poly(acrylicacid)(PS-b-PAA)wasdesignedandcarriedoutusingmoreconvenientandinexpensivechlorotrimethylsilane/sodiumiodideasreagents.Thehydrolysisproductcanself-assembleinaqueousmediatogiveregularmicelleswithPSblockformingthecoreandPAL4blockformingthecorona,orintetrahydrofuran(THF)togivereversemicelleswiththehydrophilicblockinthecore.