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简介：AnewtypeofcrystallineantimonicacidSb2O5·3H2Owassynthesized.Thecomposition,crystalstructure,theequilibriumdistributioncoefficientsforsodiumandpotassiumionsandtheion-exchangecapacityofthisexchangerweredetermined.Withthisexchanger,sodiuminoswereremovedfrompotassiumchloride,andthecontentofsodiumchloridewasreducedfrom3.24%to0.02%.Comparedwithotherion-exchangematerials,thecrystallineantimonicacidgivesandunusualselectivityforpotassiumandsodiumions.ThedifferentcompositionsandpropertiesofantimonicacidexchangersareobtainedthroughdifferentpreparingconditionsanditscrystallineformulaofSb2O5·4H2O(C-SbA1)iscurrentlyaccepted.Thispaperreportsanewtypeofcrystallineantimonicacid-Sb2O5·3H2O(C-SbA2),synthesizedbyanimprovedKuzin′smethod.SodiumionsareremovedfrompotassiumchloridewithC-SbA2.TheexchangeefficiencyisbetterthanthatofC-SbA1.

简介：Thepresentpaperdealswiththeuseofanewpolymericflameretardantmaterial,polyphenylenesulphide(PPS)forplastics.Incorporationof15—20%PPSintonylon-6hasprovidedULV-0ratingforthesystemandthereisenhancementintensileandflexuralproperties.Theresultsobtainedonthethermal,crystallizationandflowcharacteristicsofthenylon-PPSsystemuptoaloadingof40%PPSarealsodiscussed.

简介：Lineardrivingforce(LDF)modeliswidelyusedinadiffusionprocess,However,thismodelhasinherentweakness.Whenthedimensionlesstimeislessthan0.1itsrelativeerrorisupto95%.Inthispaper,anewconcentrationprofileisproposed.andthenanewmodifiedLDFmodel(MLDF)isdeduced.Comparedwiththeexactsolutionofintraparticlediffusionequation,thetransientvolume-averageamountadsorbedcalculatedfromtheMLDFismoreaccuratethanthatcalculatedfromtheLDFmodel.Ifonetakes±10%relativeerrorforthelimitofvalidityofapproximation,thenewmodelisvalidwhenthedimensionlesstimeisjustlargerthan0.0002,whiletheLDFmodelisnotvaliduntilthedimensiontimeislargethan0.05,ThenewmodelissuperiortotheLDFmodel.ThenewconcentrationprofilescorrespondingtotheMLDFmodelaremuchclosetotheexactconcentrationprofileswithinaparticlethantheparabolicprofilescorrespondingtotheLDFmodel.

简介：Polymercoatedquartzcrystalmicrobalance(QCM)sensorbasedonthefrequencyshiftsduetotheadsorptionofcompoundsatthesurfaceofmodifiedquartzcrystalelectrodeisaneffectivemethodfordetectionofsarin(GB)whichisahighlytoxicnervewarfareagent.Anewfluorosiloxanepolymerhasbeensynthesizedthrough6stepsfromtrifluoromethylbenzene.Thesynthesiswasachievedfromtrifluoromethylbenzenethroughnitration,hydrogenation.Theobtainedm-nitrotrifluoromethylanilinewastreatedwithNaNO2,andthenhydrolyzedtom-nitrotrifluoromethylphenol.m-nitrotrifluoromethylphenolwasreactedwithallylbromidetotheetherproduct.TheproductwasrearrangedbyClaisenrearrangement,andthenreactedwithpolymethylhydrosiloxaneundercatalystofPt/DVTMS.Thefluorosiloxanepolymercanbeobtained.ThepolymerhasbeensuccessfullyusedasQCMcoatingmaterial.

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简介：PPV－basedcopolymerswithcyanogroupinthemainchainhavebeensynthesizedbyWittig-typepolycondensationofalkoxy-substituteddialdehydesand4,4'-bis(cyanomethyl)-substituteddiphenylether:[-C6H4-O-C6H4-C(CN)=CH-C6H2(OR)2-C=C(CN)-]n(POPPV),Thecopolymersarehighlysolubleincommonsolventsandtheirsuperhighlytransparenthomogeneousthinfilmscanbeformedbyspincoatingdirectlywithoutheattreatment.ThechemicalstructuresaredeterminedbyNMRandIRspectroscopysandevaluatedusingphotoluminescence,gel-permeationchromatography(GPC)andDSC(orTGA)methods.TheincorporationofethergroupintothePPVbackbonehasaninterruptionofthemain-chainconjugation,thatresultsintheblue-shiftofelectroluminescencespectraandenhancemntthesolubility.

简介：Discussionispresentedontheuseofthephotoisomerizationofazobenzenechromophoreinthedesignandpreparationofnovelfunctionalmaterials.Thetwosystemsreviewedareazobenzenepolymer-stabilizedliquidcrystalsandazobenzeneelastomers.Inthefirstcase,apolymernetworkcontainingazobenzenemoietiesisusedtoopticallyinduceandstabilizealong-rangeliquidcrystalorientationwithouttheneedoftreatingthesurfacesofthesubstrates.Thisopticalandrubbing-freeapproachwasappliedtonematicandferroelectricliquidcrystals.Inthesecondcase,anazobenzeneside-chainliquidcrystallinepolymerisgraftedontoastyrene-butadiene-styrenetriblockcopolymertoyieldaphotoactivethermoplasticelastomer.Coupledmechanicalandopticaleffectsmakepossibletheformationofdiffractiongratingsthatmaybeusefulformechanicallytunableopticaldevices.

简介：Polymersupportedalkyldimethylbenzylammoniumchlorideresindisinfectantusedforthedisinfectionofdrinkingwaterhasbeensynthesized,anditsantibacterialactivitieshavebeendetermined,comparedwiththecommerciallyusedtriiodinedisinfectantresin.Theresindisinfectantwasgeneratedsuccessfullywhenusethecombinationofsurfaceactiveagentsandultrosonic.

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简介：Acopolymerofbismaleimide-diallylbisphenolA-diphenylsilandiolwassynthesizedandthecopolymerizationwasstudiedbyusingN-phenylmaleimide,bisphenolAanddiphenyl-silandiolasmodelcompounds.Thecopolymercouldbewellcuredaround200℃,andthecuredresinshadgoodthermalstabilityIntherangeof170-210℃,ahighercuringtemperaturewasfavorabletoobtainmorethermalstableresinbyreducingthecontentofdiphenylsilandiolcyclo-homopolymerinresinwhichwouldspoilitsthermalstability

简介：ThispaperreportsthestudyonthepolymerprotectedcatalystCPVC-FeCl3usedinesterification,transesterification,synthesisofacetalsorketalsandrearrangementreactionofpinacol.Thecatalysthastheadvantagesofbeingsimpleinoperation,non-corrosive,easytoseparatefrommixturesandgoodreusability.

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简介：AdsorptionresinAASwasusedfortheseparationandpurificationofmilupeinan(M-13)fromitsmotherliquor.ThegoodadsorptionpropertyofAASadsorptionresinwasfoundformilupeinan(M-13)comparedwiththeDiaionCHP20p.Whenacetoneandwater(2:1involume)wereusedasdesorptionreagents,itwasfoundthat3timesofbedvolumeofthedesorptionreagentswouldmaketheAASresinwhichwassaturatelyadsorptedM-13desorptioncompletely.Alsoamacroporousanionexchangeresin(Poly-4-vinylpyridinetype)D-280wasusedforthedecolourizationfromM-13solution.Goodresultswasgivenwhenthesr=1～2.

简介：Anewionexchangekineticsequationincludingresinphasesaturationfactorispresentedinthispaper.Theequationischaracterizedbytheapparentreactionorderandapparentsaturationorder.

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简介：小说芳香脂肪族(amide-imide)poly，在方面链在主要的链和氢氧根benzamide单位包含chiral单位的s从3,5-diamino-N-(4-hydroxyphenyl)的步生长聚合被获得了有不同chiral二酸氯化物(1a1e)的benzamide(2)。理论计算借助于计算化学方法被做叙述在反应下面的每二酸氯化物单体的稳定的符合构造和取向调节。这些聚合物被常规技术描绘。产生聚合物显示出好热稳定性。包括crystallinity，固有的粘性和词法特征的聚合物的另外的物理性质也被学习。